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class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2412.05151">arXiv:2412.05151</a> <span> [<a href="https://arxiv.org/pdf/2412.05151">pdf</a>, <a href="https://arxiv.org/format/2412.05151">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> </div> </div> <p class="title is-5 mathjax"> Analysis of long-lived effects in high-repetition-rate stroboscopic transient X-ray absorption experiments on thin films </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/?searchtype=author&query=Lojewski%2C+T">Tobias Lojewski</a>, <a href="/search/?searchtype=author&query=Guyader%2C+L+L">Lo茂c Le Guyader</a>, <a href="/search/?searchtype=author&query=Agarwal%2C+N">Naman Agarwal</a>, <a href="/search/?searchtype=author&query=Boeglin%2C+C">Christine Boeglin</a>, <a href="/search/?searchtype=author&query=Carley%2C+R">Robert Carley</a>, <a href="/search/?searchtype=author&query=Castoldi%2C+A">Andrea Castoldi</a>, <a href="/search/?searchtype=author&query=Deiter%2C+C">Carsten Deiter</a>, <a href="/search/?searchtype=author&query=Engel%2C+R+Y">Robin Y. Engel</a>, <a href="/search/?searchtype=author&query=Erdinger%2C+F">Florian Erdinger</a>, <a href="/search/?searchtype=author&query=Fangohr%2C+H">Hans Fangohr</a>, <a href="/search/?searchtype=author&query=Fiorini%2C+C">Carlo Fiorini</a>, <a href="/search/?searchtype=author&query=Gerasimova%2C+N">Natalia Gerasimova</a>, <a href="/search/?searchtype=author&query=Gort%2C+R">Rafael Gort</a>, <a href="/search/?searchtype=author&query=de+Groot%2C+F">Frank de Groot</a>, <a href="/search/?searchtype=author&query=Hansen%2C+K">Karsten Hansen</a>, <a href="/search/?searchtype=author&query=Hauf%2C+S">Steffen Hauf</a>, <a href="/search/?searchtype=author&query=Hickin%2C+D">David Hickin</a>, <a href="/search/?searchtype=author&query=Izquierdo%2C+M">Manuel Izquierdo</a>, <a href="/search/?searchtype=author&query=K%C3%A4mmerer%2C+L">Lea K盲mmerer</a>, <a href="/search/?searchtype=author&query=Van+Kuiken%2C+B+E">Benjamin E. Van Kuiken</a>, <a href="/search/?searchtype=author&query=Lomidze%2C+D">David Lomidze</a>, <a href="/search/?searchtype=author&query=Maffessanti%2C+S">Stefano Maffessanti</a>, <a href="/search/?searchtype=author&query=Mercadier%2C+L">Laurent Mercadier</a>, <a href="/search/?searchtype=author&query=Mercurio%2C+G">Giuseppe Mercurio</a>, <a href="/search/?searchtype=author&query=Miedema%2C+P+S">Piter S. Miedema</a> , et al. (19 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2412.05151v1-abstract-short" style="display: inline;"> Time-resolved X-ray absorption spectroscopy (tr-XAS) has been shown to be a versatile measurement technique for investigating non-equilibrium dynamics. Novel X-ray free electron laser (XFEL) facilities like the European XFEL offer increased repetition rates for stroboscopic XAS experiments through a burst operation mode, which enables measurements with up to 4.5 MHz. These higher repetition rates… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2412.05151v1-abstract-full').style.display = 'inline'; document.getElementById('2412.05151v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2412.05151v1-abstract-full" style="display: none;"> Time-resolved X-ray absorption spectroscopy (tr-XAS) has been shown to be a versatile measurement technique for investigating non-equilibrium dynamics. Novel X-ray free electron laser (XFEL) facilities like the European XFEL offer increased repetition rates for stroboscopic XAS experiments through a burst operation mode, which enables measurements with up to 4.5 MHz. These higher repetition rates lead to higher data acquisition rates but can also introduce long-lived excitations that persist and thus build up during each burst. Here, we report on such long-lived effects in Ni and NiO thin film samples that were measured at the European XFEL. We disentangle the long-lived excitations from the initial pump-induced change and perform a detailed modelling-based analysis of how they modify transient X-ray spectra. As a result, we link the long-lived effects in Ni to a local temperature increase, as well as the effects in NiO to excited charge carrier trapping through polaron formation. In addition, we present possible correction methods, as well as discuss ways in which the effects of these long-lived excitations could be minimized for future time-resolved X-ray absorption spectroscopy measurements. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2412.05151v1-abstract-full').style.display = 'none'; document.getElementById('2412.05151v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 6 December, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> December 2024. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2403.08461">arXiv:2403.08461</a> <span> [<a href="https://arxiv.org/pdf/2403.08461">pdf</a>, <a href="https://arxiv.org/format/2403.08461">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Strongly Correlated Electrons">cond-mat.str-el</span> </div> </div> <p class="title is-5 mathjax"> The Heisenberg-RIXS instrument at the European XFEL </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/?searchtype=author&query=Schlappa%2C+J">Justine Schlappa</a>, <a href="/search/?searchtype=author&query=Ghiringhelli%2C+G">Giacomo Ghiringhelli</a>, <a href="/search/?searchtype=author&query=Van+Kuiken%2C+B+E">Benjamin E. Van Kuiken</a>, <a href="/search/?searchtype=author&query=Teichmann%2C+M">Martin Teichmann</a>, <a href="/search/?searchtype=author&query=Miedema%2C+P+S">Piter S. Miedema</a>, <a href="/search/?searchtype=author&query=Delitz%2C+J+T">Jan Torben Delitz</a>, <a href="/search/?searchtype=author&query=Gerasimova%2C+N">Natalia Gerasimova</a>, <a href="/search/?searchtype=author&query=Molodtsov%2C+S">Serguei Molodtsov</a>, <a href="/search/?searchtype=author&query=Adriano%2C+L">Luigi Adriano</a>, <a href="/search/?searchtype=author&query=Baranasic%2C+B">Bernard Baranasic</a>, <a href="/search/?searchtype=author&query=Broers%2C+C">Carsten Broers</a>, <a href="/search/?searchtype=author&query=Carley%2C+R">Robert Carley</a>, <a href="/search/?searchtype=author&query=Gessler%2C+P">Patrick Gessler</a>, <a href="/search/?searchtype=author&query=Ghodrati%2C+N">Nahid Ghodrati</a>, <a href="/search/?searchtype=author&query=Hickin%2C+D">David Hickin</a>, <a href="/search/?searchtype=author&query=Hoang%2C+L+P">Le Phuong Hoang</a>, <a href="/search/?searchtype=author&query=Izquierdo%2C+M">Manuel Izquierdo</a>, <a href="/search/?searchtype=author&query=Mercadier%2C+L">Laurent Mercadier</a>, <a href="/search/?searchtype=author&query=Mercurio%2C+G">Giuseppe Mercurio</a>, <a href="/search/?searchtype=author&query=Parchenko%2C+S">Sergii Parchenko</a>, <a href="/search/?searchtype=author&query=Stupar%2C+M">Marijan Stupar</a>, <a href="/search/?searchtype=author&query=Yin%2C+Z">Zhong Yin</a>, <a href="/search/?searchtype=author&query=Martinelli%2C+L">Leonardo Martinelli</a>, <a href="/search/?searchtype=author&query=Merzoni%2C+G">Giacomo Merzoni</a>, <a href="/search/?searchtype=author&query=Peng%2C+Y+Y">Ying Ying Peng</a> , et al. (22 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2403.08461v1-abstract-short" style="display: inline;"> Resonant Inelastic X-ray Scattering (RIXS) is an ideal X-ray spectroscopy method to push the combination of energy and time resolutions to the Fourier transform ultimate limit, because it is unaffected by the core-hole lifetime energy broadening. And in pump-probe experiments the interaction time is made very short by the same core-hole lifetime. RIXS is very photon hungry so it takes great advant… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2403.08461v1-abstract-full').style.display = 'inline'; document.getElementById('2403.08461v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2403.08461v1-abstract-full" style="display: none;"> Resonant Inelastic X-ray Scattering (RIXS) is an ideal X-ray spectroscopy method to push the combination of energy and time resolutions to the Fourier transform ultimate limit, because it is unaffected by the core-hole lifetime energy broadening. And in pump-probe experiments the interaction time is made very short by the same core-hole lifetime. RIXS is very photon hungry so it takes great advantage from high repetition rate pulsed X-ray sources like the European XFEL. The hRIXS instrument is designed for RIXS experiments in the soft X-ray range with energy resolution approaching the Fourier and the Heisenberg limits. It is based on a spherical grating with variable line spacing (VLS) and a position-sensitive 2D detector. Initially, two gratings are installed to adequately cover the whole photon energy range. With optimized spot size on the sample and small pixel detector the energy resolution can be better than 40 meV at any photon energy below 1000 eV. At the SCS instrument of the European XFEL the spectrometer can be easily positioned thanks to air-pads on a high-quality floor, allowing the scattering angle to be continuously adjusted over the 65-145 deg range. It can be coupled to two different sample interaction chamber, one for liquid jets and one for solids, each equipped at the state-of-the-art and compatible for optical laser pumping in collinear geometry. The measured performances, in terms of energy resolution and count rate on the detector, closely match design expectations. hRIXS is open to public users since the summer of 2022. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2403.08461v1-abstract-full').style.display = 'none'; document.getElementById('2403.08461v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 13 March, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> March 2024. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">43 pages, 12 figures, Supplemental Material</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2312.01483">arXiv:2312.01483</a> <span> [<a href="https://arxiv.org/pdf/2312.01483">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Mesoscale and Nanoscale Physics">cond-mat.mes-hall</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Chemical Physics">physics.chem-ph</span> </div> </div> <p class="title is-5 mathjax"> Femtosecond spin-state switching dynamics of spin-crossover molecules condensed in thin films </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/?searchtype=author&query=K%C3%A4mmerer%2C+L">Lea K盲mmerer</a>, <a href="/search/?searchtype=author&query=K%C3%A4mmerer%2C+G">G茅rald K盲mmerer</a>, <a href="/search/?searchtype=author&query=Gruber%2C+M">Manuel Gruber</a>, <a href="/search/?searchtype=author&query=Grunwald%2C+J">Jan Grunwald</a>, <a href="/search/?searchtype=author&query=Lojewski%2C+T">Tobias Lojewski</a>, <a href="/search/?searchtype=author&query=Mercadier%2C+L">Laurent Mercadier</a>, <a href="/search/?searchtype=author&query=Guyader%2C+L+L">Lo茂c Le Guyader</a>, <a href="/search/?searchtype=author&query=Carley%2C+R">Robert Carley</a>, <a href="/search/?searchtype=author&query=Carinan%2C+C">Cammille Carinan</a>, <a href="/search/?searchtype=author&query=Gerasimova%2C+N">Natalia Gerasimova</a>, <a href="/search/?searchtype=author&query=Hickin%2C+D">David Hickin</a>, <a href="/search/?searchtype=author&query=Van+Kuiken%2C+B+E">Benjamin E. Van Kuiken</a>, <a href="/search/?searchtype=author&query=Mercurio%2C+G">Giuseppe Mercurio</a>, <a href="/search/?searchtype=author&query=Teichmann%2C+M">Martin Teichmann</a>, <a href="/search/?searchtype=author&query=Kuppusamy%2C+S+K">Senthil Kumar Kuppusamy</a>, <a href="/search/?searchtype=author&query=Scherz%2C+A">Andreas Scherz</a>, <a href="/search/?searchtype=author&query=Ruben%2C+M">Mario Ruben</a>, <a href="/search/?searchtype=author&query=Sokolowski-Tinten%2C+K">Klaus Sokolowski-Tinten</a>, <a href="/search/?searchtype=author&query=Eschenlohr%2C+A">Andrea Eschenlohr</a>, <a href="/search/?searchtype=author&query=Ollefs%2C+K">Katharina Ollefs</a>, <a href="/search/?searchtype=author&query=Schmitz-Antoniak%2C+C">Carolin Schmitz-Antoniak</a>, <a href="/search/?searchtype=author&query=Tuczek%2C+F">Felix Tuczek</a>, <a href="/search/?searchtype=author&query=Kratzer%2C+P">Peter Kratzer</a>, <a href="/search/?searchtype=author&query=Bovensiepen%2C+U">Uwe Bovensiepen</a>, <a href="/search/?searchtype=author&query=Wende%2C+H">Heiko Wende</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2312.01483v1-abstract-short" style="display: inline;"> The photoinduced switching of Fe(II)-based spin-crossover complexes from singlet to quintet takes place at ultrafast time scales. This a priori spin-forbidden transition triggered numerous time-resolved experiments of solvated samples to elucidate the mechanism at play. The involved intermediate states remain uncertain. We apply ultrafast x-ray spectroscopy in molecular films as a method sensitive… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2312.01483v1-abstract-full').style.display = 'inline'; document.getElementById('2312.01483v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2312.01483v1-abstract-full" style="display: none;"> The photoinduced switching of Fe(II)-based spin-crossover complexes from singlet to quintet takes place at ultrafast time scales. This a priori spin-forbidden transition triggered numerous time-resolved experiments of solvated samples to elucidate the mechanism at play. The involved intermediate states remain uncertain. We apply ultrafast x-ray spectroscopy in molecular films as a method sensitive to spin, electronic, and nuclear degrees of freedom. Combining the progress in molecule synthesis and film growth with the opportunities at x-ray free-electron lasers, we analyze the transient evolution of the Fe L3 fine structure at room temperature. Our measurements and calculations indicate the involvement of an Fe triplet intermediate state. The high-spin state saturates at half of the available molecules, limited by molecule-molecule interaction within the film. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2312.01483v1-abstract-full').style.display = 'none'; document.getElementById('2312.01483v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 3 December, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> December 2023. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2304.08890">arXiv:2304.08890</a> <span> [<a href="https://arxiv.org/pdf/2304.08890">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Strongly Correlated Electrons">cond-mat.str-el</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Optics">physics.optics</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1002/advs.202302550">10.1002/advs.202302550 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Transient non-collinear magnetic state for all-optical magnetization switching </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/?searchtype=author&query=Parchenko%2C+S">Sergii Parchenko</a>, <a href="/search/?searchtype=author&query=Frej%2C+A">Antoni Frej</a>, <a href="/search/?searchtype=author&query=Ueda%2C+H">Hiroki Ueda</a>, <a href="/search/?searchtype=author&query=Carley%2C+R">Robert Carley</a>, <a href="/search/?searchtype=author&query=Mercadier%2C+L">Laurent Mercadier</a>, <a href="/search/?searchtype=author&query=Gerasimova%2C+N">Natalia Gerasimova</a>, <a href="/search/?searchtype=author&query=Mercurio%2C+G">Giuseppe Mercurio</a>, <a href="/search/?searchtype=author&query=Schlappa%2C+J">Justine Schlappa</a>, <a href="/search/?searchtype=author&query=Yaroslavtsev%2C+A">Alexander Yaroslavtsev</a>, <a href="/search/?searchtype=author&query=Agarwal%2C+N">Naman Agarwal</a>, <a href="/search/?searchtype=author&query=Gort%2C+R">Rafael Gort</a>, <a href="/search/?searchtype=author&query=Scherz%2C+A">Andreas Scherz</a>, <a href="/search/?searchtype=author&query=Zvezdin%2C+A">Anatoly Zvezdin</a>, <a href="/search/?searchtype=author&query=Stupakiewicz%2C+A">Andrzej Stupakiewicz</a>, <a href="/search/?searchtype=author&query=Staub%2C+U">Urs Staub</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2304.08890v1-abstract-short" style="display: inline;"> Resonant absorption of a photon by bound electrons in a solid can promote an electron to another orbital state or transfer it to a neighboring atomic site. Such a transition in a magnetically ordered material could affect the magnetic order. While this process is an obvious road map for optical control of magnetization, experimental demonstration of such a process remains challenging. Exciting a s… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2304.08890v1-abstract-full').style.display = 'inline'; document.getElementById('2304.08890v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2304.08890v1-abstract-full" style="display: none;"> Resonant absorption of a photon by bound electrons in a solid can promote an electron to another orbital state or transfer it to a neighboring atomic site. Such a transition in a magnetically ordered material could affect the magnetic order. While this process is an obvious road map for optical control of magnetization, experimental demonstration of such a process remains challenging. Exciting a significant fraction of magnetic ions requires a very intense incoming light beam, as orbital resonances are often weak compared to above-band-gap excitations. In the latter case, a sizeable reduction of the magnetization occurs as the absorbed energy increases the spin temperature, masking the non-thermal optical effects. Here, using ultrafast x-ray spectroscopy, we were able to resolve changes in the magnetization state induced by resonant absorption of infrared photons in Co-doped yttrium iron garnet, with negligible thermal effects. We found that the optical excitation of the Co ions affects the two distinct magnetic Fe sublattices differently, resulting in a transient non-collinear magnetic state. The present results indicate that the all-optical magnetization switching most likely occurs due to the creation of a transient, non-collinear magnetic state followed by coherent spin rotations of the Fe moments. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2304.08890v1-abstract-full').style.display = 'none'; document.getElementById('2304.08890v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 18 April, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> April 2023. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Adv. Sci. 10, 2302550 (2023) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2211.17008">arXiv:2211.17008</a> <span> [<a href="https://arxiv.org/pdf/2211.17008">pdf</a>, <a href="https://arxiv.org/format/2211.17008">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1063/4.0000206">10.1063/4.0000206 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Electron Dynamics at High-Energy Densities in Nickel from Non-linear Resonant X-ray Absorption Spectra </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/?searchtype=author&query=Engel%2C+R+Y">Robin Y. Engel</a>, <a href="/search/?searchtype=author&query=Alexander%2C+O">Oliver Alexander</a>, <a href="/search/?searchtype=author&query=Atak%2C+K">Kaan Atak</a>, <a href="/search/?searchtype=author&query=Bovensiepen%2C+U">Uwe Bovensiepen</a>, <a href="/search/?searchtype=author&query=Buck%2C+J">Jens Buck</a>, <a href="/search/?searchtype=author&query=Carley%2C+R">Robert Carley</a>, <a href="/search/?searchtype=author&query=Cascella%2C+M">Michele Cascella</a>, <a href="/search/?searchtype=author&query=Chardonnet%2C+V">Valentin Chardonnet</a>, <a href="/search/?searchtype=author&query=Chiuzbaian%2C+G+S">Gheorghe Sorin Chiuzbaian</a>, <a href="/search/?searchtype=author&query=David%2C+C">Christian David</a>, <a href="/search/?searchtype=author&query=D%C3%B6ring%2C+F">Florian D枚ring</a>, <a href="/search/?searchtype=author&query=Eschenlohr%2C+A">Andrea Eschenlohr</a>, <a href="/search/?searchtype=author&query=Gerasimova%2C+N">Natalia Gerasimova</a>, <a href="/search/?searchtype=author&query=de+Groot%2C+F">Frank de Groot</a>, <a href="/search/?searchtype=author&query=Guyader%2C+L+L">Lo茂c Le Guyader</a>, <a href="/search/?searchtype=author&query=Humphries%2C+O+S">Oliver S. Humphries</a>, <a href="/search/?searchtype=author&query=Izquierdo%2C+M">Manuel Izquierdo</a>, <a href="/search/?searchtype=author&query=Jal%2C+E">Emmanuelle Jal</a>, <a href="/search/?searchtype=author&query=Kubec%2C+A">Adam Kubec</a>, <a href="/search/?searchtype=author&query=Laarmann%2C+T">Tim Laarmann</a>, <a href="/search/?searchtype=author&query=Lambert%2C+C">Charles-Henri Lambert</a>, <a href="/search/?searchtype=author&query=L%C3%BCning%2C+J">Jan L眉ning</a>, <a href="/search/?searchtype=author&query=Marangos%2C+J+P">Jonathan P. Marangos</a>, <a href="/search/?searchtype=author&query=Mercadier%2C+L">Laurent Mercadier</a>, <a href="/search/?searchtype=author&query=Mercurio%2C+G">Giuseppe Mercurio</a> , et al. (18 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2211.17008v1-abstract-short" style="display: inline;"> The pulse intensity from X-ray free-electron lasers (FELs) can create extreme excitation densities in solids, entering the regime of non-linear X-ray-matter interactions. We show L3-edge absorption spectra of metallic nickel thin films with fluences entering a regime where several X-ray photons are incident per absorption cross-section. Main features of the observed non-linear spectral changes are… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2211.17008v1-abstract-full').style.display = 'inline'; document.getElementById('2211.17008v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2211.17008v1-abstract-full" style="display: none;"> The pulse intensity from X-ray free-electron lasers (FELs) can create extreme excitation densities in solids, entering the regime of non-linear X-ray-matter interactions. We show L3-edge absorption spectra of metallic nickel thin films with fluences entering a regime where several X-ray photons are incident per absorption cross-section. Main features of the observed non-linear spectral changes are described with a predictive rate model for electron population dynamics during the pulse, utilizing a fixed density of states and tabulated ground-state properties. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2211.17008v1-abstract-full').style.display = 'none'; document.getElementById('2211.17008v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 30 November, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 2022. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">The main text contains 5 pages and 4 figures, the total length including supplement is 14 pages, 7 figures and one table. See also the simultaneously submitted paper about the rate model</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2211.04265">arXiv:2211.04265</a> <span> [<a href="https://arxiv.org/pdf/2211.04265">pdf</a>, <a href="https://arxiv.org/format/2211.04265">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Strongly Correlated Electrons">cond-mat.str-el</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1107/S1600577523000619">10.1107/S1600577523000619 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Photon shot-noise limited transient absorption soft X-ray spectroscopy at the European XFEL </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/?searchtype=author&query=Guyader%2C+L+L">Lo茂c Le Guyader</a>, <a href="/search/?searchtype=author&query=Eschenlohr%2C+A">Andrea Eschenlohr</a>, <a href="/search/?searchtype=author&query=Beye%2C+M">Martin Beye</a>, <a href="/search/?searchtype=author&query=Schlotter%2C+W">William Schlotter</a>, <a href="/search/?searchtype=author&query=D%C3%B6ring%2C+F">Florian D枚ring</a>, <a href="/search/?searchtype=author&query=Carinan%2C+C">Cammille Carinan</a>, <a href="/search/?searchtype=author&query=Hickin%2C+D">David Hickin</a>, <a href="/search/?searchtype=author&query=Agarwal%2C+N">Naman Agarwal</a>, <a href="/search/?searchtype=author&query=Boeglin%2C+C">Christine Boeglin</a>, <a href="/search/?searchtype=author&query=Bovensiepen%2C+U">Uwe Bovensiepen</a>, <a href="/search/?searchtype=author&query=Buck%2C+J">Jens Buck</a>, <a href="/search/?searchtype=author&query=Carley%2C+R">Robert Carley</a>, <a href="/search/?searchtype=author&query=Castoldi%2C+A">Andrea Castoldi</a>, <a href="/search/?searchtype=author&query=D%27Elia%2C+A">Alessandro D'Elia</a>, <a href="/search/?searchtype=author&query=Delitz%2C+J">Jan-Torben Delitz</a>, <a href="/search/?searchtype=author&query=Ehsan%2C+W">Wajid Ehsan</a>, <a href="/search/?searchtype=author&query=Engel%2C+R">Robin Engel</a>, <a href="/search/?searchtype=author&query=Erdinger%2C+F">Florian Erdinger</a>, <a href="/search/?searchtype=author&query=Fangohr%2C+H">Hans Fangohr</a>, <a href="/search/?searchtype=author&query=Fischer%2C+P">Peter Fischer</a>, <a href="/search/?searchtype=author&query=Fiorini%2C+C">Carlo Fiorini</a>, <a href="/search/?searchtype=author&query=F%C3%B6hlisch%2C+A">Alexander F枚hlisch</a>, <a href="/search/?searchtype=author&query=Gelisio%2C+L">Luca Gelisio</a>, <a href="/search/?searchtype=author&query=Gensch%2C+M">Michael Gensch</a>, <a href="/search/?searchtype=author&query=Gerasimova%2C+N">Natalia Gerasimova</a> , et al. (39 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2211.04265v3-abstract-short" style="display: inline;"> Femtosecond transient soft X-ray Absorption Spectroscopy (XAS) is a very promising technique that can be employed at X-ray Free Electron Lasers (FELs) to investigate out-of-equilibrium dynamics for material and energy research. Here we present a dedicated setup for soft X-rays available at the Spectroscopy & Coherent Scattering (SCS) instrument at the European X-ray Free Electron Laser (EuXFEL). I… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2211.04265v3-abstract-full').style.display = 'inline'; document.getElementById('2211.04265v3-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2211.04265v3-abstract-full" style="display: none;"> Femtosecond transient soft X-ray Absorption Spectroscopy (XAS) is a very promising technique that can be employed at X-ray Free Electron Lasers (FELs) to investigate out-of-equilibrium dynamics for material and energy research. Here we present a dedicated setup for soft X-rays available at the Spectroscopy & Coherent Scattering (SCS) instrument at the European X-ray Free Electron Laser (EuXFEL). It consists of a beam-splitting off-axis zone plate (BOZ) used in transmission to create three copies of the incoming beam, which are used to measure the transmitted intensity through the excited and unexcited sample, as well as to monitor the incoming intensity. Since these three intensity signals are detected shot-by-shot and simultaneously, this setup allows normalized shot-by-shot analysis of the transmission. For photon detection, the DSSC imaging detector, which is capable of recording up to 800 images at 4.5 MHz frame rate during the FEL burst, is employed and allows approaching the photon shot-noise limit. We review the setup and its capabilities, as well as the online and offline analysis tools provided to users. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2211.04265v3-abstract-full').style.display = 'none'; document.getElementById('2211.04265v3-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 4 January, 2023; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 8 November, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 2022. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">11 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> J. Synchrotron Rad. (2023). 30, 284-300 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2210.13162">arXiv:2210.13162</a> <span> [<a href="https://arxiv.org/pdf/2210.13162">pdf</a>, <a href="https://arxiv.org/format/2210.13162">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1080/21663831.2023.2210606">10.1080/21663831.2023.2210606 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> The interplay of local electron correlations and ultrafast spin dynamics in fcc Ni </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/?searchtype=author&query=Lojewski%2C+T">Tobias Lojewski</a>, <a href="/search/?searchtype=author&query=Elhanoty%2C+M+F">Mohamed F. Elhanoty</a>, <a href="/search/?searchtype=author&query=Guyader%2C+L+L">Lo茂c Le Guyader</a>, <a href="/search/?searchtype=author&query=Gr%C3%A5n%C3%A4s%2C+O">Oscar Gr氓n盲s</a>, <a href="/search/?searchtype=author&query=Agarwal%2C+N">Naman Agarwal</a>, <a href="/search/?searchtype=author&query=Boeglin%2C+C">Christine Boeglin</a>, <a href="/search/?searchtype=author&query=Carley%2C+R">Robert Carley</a>, <a href="/search/?searchtype=author&query=Castoldi%2C+A">Andrea Castoldi</a>, <a href="/search/?searchtype=author&query=David%2C+C">Christian David</a>, <a href="/search/?searchtype=author&query=Deiter%2C+C">Carsten Deiter</a>, <a href="/search/?searchtype=author&query=D%C3%B6ring%2C+F">Florian D枚ring</a>, <a href="/search/?searchtype=author&query=Engel%2C+R+Y">Robin Y. Engel</a>, <a href="/search/?searchtype=author&query=Erdinger%2C+F">Florian Erdinger</a>, <a href="/search/?searchtype=author&query=Fangohr%2C+H">Hans Fangohr</a>, <a href="/search/?searchtype=author&query=Fiorini%2C+C">Carlo Fiorini</a>, <a href="/search/?searchtype=author&query=Fischer%2C+P">Peter Fischer</a>, <a href="/search/?searchtype=author&query=Gerasimova%2C+N">Natalia Gerasimova</a>, <a href="/search/?searchtype=author&query=Gort%2C+R">Rafael Gort</a>, <a href="/search/?searchtype=author&query=de+Groot%2C+F">Frank de Groot</a>, <a href="/search/?searchtype=author&query=Hansen%2C+K">Karsten Hansen</a>, <a href="/search/?searchtype=author&query=Hauf%2C+S">Steffen Hauf</a>, <a href="/search/?searchtype=author&query=Hickin%2C+D">David Hickin</a>, <a href="/search/?searchtype=author&query=Izquierdo%2C+M">Manuel Izquierdo</a>, <a href="/search/?searchtype=author&query=Van+Kuiken%2C+B+E">Benjamin E. Van Kuiken</a>, <a href="/search/?searchtype=author&query=Kvashnin%2C+Y">Yaroslav Kvashnin</a> , et al. (26 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2210.13162v1-abstract-short" style="display: inline;"> The complex electronic structure of metallic ferromagnets is determined by a balance between exchange interaction, electron hopping leading to band formation, and local Coulomb repulsion. The interplay between the respective terms of the Hamiltonian is of fundamental interest, since it produces most, if not all, of the exotic phenomena observed in the solid state. By combining high energy and temp… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2210.13162v1-abstract-full').style.display = 'inline'; document.getElementById('2210.13162v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2210.13162v1-abstract-full" style="display: none;"> The complex electronic structure of metallic ferromagnets is determined by a balance between exchange interaction, electron hopping leading to band formation, and local Coulomb repulsion. The interplay between the respective terms of the Hamiltonian is of fundamental interest, since it produces most, if not all, of the exotic phenomena observed in the solid state. By combining high energy and temporal resolution in femtosecond time-resolved X-ray absorption spectroscopy with ab initio time-dependent density functional theory we analyze the electronic structure in fcc Ni on the time scale of these interactions in a pump-probe experiment. We distinguish transient broadening and energy shifts in the absorption spectra, which we demonstrate to be caused by electron repopulation and correlation-induced modifications of the electronic structure, respectively. Importantly, the theoretical description of this experimental result hence requires to take the local Coulomb interaction into account, revealing a temporal interplay between band formation, exchange interaction, and Coulomb repulsion. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2210.13162v1-abstract-full').style.display = 'none'; document.getElementById('2210.13162v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 24 October, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 2022. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Materials Research Letters 11, 655-661 (2023) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2206.08729">arXiv:2206.08729</a> <span> [<a href="https://arxiv.org/pdf/2206.08729">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Accelerator Physics">physics.acc-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Optics">physics.optics</span> </div> </div> <p class="title is-5 mathjax"> Monochromatic operation of the SASE3 soft X-ray beamline at European XFEL </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/?searchtype=author&query=Gerasimova%2C+N">N. Gerasimova</a>, <a href="/search/?searchtype=author&query=La+Civita%2C+D">D. La Civita</a>, <a href="/search/?searchtype=author&query=Samoylova%2C+L">L. Samoylova</a>, <a href="/search/?searchtype=author&query=Vannoni%2C+M">M. Vannoni</a>, <a href="/search/?searchtype=author&query=Villanueva%2C+R">R. Villanueva</a>, <a href="/search/?searchtype=author&query=Hickin%2C+D">D. Hickin</a>, <a href="/search/?searchtype=author&query=Carley%2C+R">R. Carley</a>, <a href="/search/?searchtype=author&query=Gort%2C+R">R. Gort</a>, <a href="/search/?searchtype=author&query=Van+Kuiken%2C+B">B. Van Kuiken</a>, <a href="/search/?searchtype=author&query=Miedema%2C+P">P. Miedema</a>, <a href="/search/?searchtype=author&query=Guyarder%2C+L+L">L. Le Guyarder</a>, <a href="/search/?searchtype=author&query=Mercadier%2C+L">L. Mercadier</a>, <a href="/search/?searchtype=author&query=Mercurio%2C+G">G. Mercurio</a>, <a href="/search/?searchtype=author&query=Schlappa%2C+J">J. Schlappa</a>, <a href="/search/?searchtype=author&query=Teichman%2C+M">M. Teichman</a>, <a href="/search/?searchtype=author&query=Yaroslavtsev%2C+A">A. Yaroslavtsev</a>, <a href="/search/?searchtype=author&query=Sinn%2C+H">H. Sinn</a>, <a href="/search/?searchtype=author&query=Scherz%2C+A">A. Scherz</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2206.08729v1-abstract-short" style="display: inline;"> The SASE3 soft X-ray beamline at the European XFEL has been designed and built to provide experiments with pink or monochromatic beam in the photon energy range 250 eV - 3000 eV. Here, we focus on the monochromatic operation of the SASE3 beamline and report on design and performance of the SASE3 grating monochromator. The unique capability of an FEL source to produce short femtosecond pulses of hi… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2206.08729v1-abstract-full').style.display = 'inline'; document.getElementById('2206.08729v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2206.08729v1-abstract-full" style="display: none;"> The SASE3 soft X-ray beamline at the European XFEL has been designed and built to provide experiments with pink or monochromatic beam in the photon energy range 250 eV - 3000 eV. Here, we focus on the monochromatic operation of the SASE3 beamline and report on design and performance of the SASE3 grating monochromator. The unique capability of an FEL source to produce short femtosecond pulses of high degree of coherence challenges the monochromator design by a demand to control both photon energy and temporal resolution. The aim to transport close to transform-limited pulses poses very high demands on the optics quality, in particular on the grating. The current realization of the SASE3 monochromator is discussed in comparison with optimal design performance. Presently, the monochromator operates with two gratings: the low-resolution grating is optimized for time-resolved experiments and allows for moderate resolving power of about 2000 - 5000 along with pulse stretching of few to few tens of femtoseconds RMS, and the high-resolution grating reaches resolving power of 10000 at a cost of larger pulse stretching. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2206.08729v1-abstract-full').style.display = 'none'; document.getElementById('2206.08729v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 17 June, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> June 2022. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2112.09587">arXiv:2112.09587</a> <span> [<a href="https://arxiv.org/pdf/2112.09587">pdf</a>, <a href="https://arxiv.org/format/2112.09587">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Mesoscale and Nanoscale Physics">cond-mat.mes-hall</span> </div> </div> <p class="title is-5 mathjax"> Symmetry-dependent ultrafast manipulation of nanoscale magnetic domains </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/?searchtype=author&query=Hagstr%C3%B6m%2C+N+Z">Nanna Zhou Hagstr枚m</a>, <a href="/search/?searchtype=author&query=Jangid%2C+R">Rahul Jangid</a>, <a href="/search/?searchtype=author&query=Meera"> Meera</a>, <a href="/search/?searchtype=author&query=Turenne%2C+D">Diego Turenne</a>, <a href="/search/?searchtype=author&query=Brock%2C+J">Jeffrey Brock</a>, <a href="/search/?searchtype=author&query=Lamb%2C+E+S">Erik S. Lamb</a>, <a href="/search/?searchtype=author&query=Stoychev%2C+B">Boyan Stoychev</a>, <a href="/search/?searchtype=author&query=Schlappa%2C+J">Justine Schlappa</a>, <a href="/search/?searchtype=author&query=Gerasimova%2C+N">Natalia Gerasimova</a>, <a href="/search/?searchtype=author&query=Van+Kuiken%2C+B">Benjamin Van Kuiken</a>, <a href="/search/?searchtype=author&query=Gort%2C+R">Rafael Gort</a>, <a href="/search/?searchtype=author&query=Mercadier%2C+L">Laurent Mercadier</a>, <a href="/search/?searchtype=author&query=Guyader%2C+L+L">Lo茂c Le Guyader</a>, <a href="/search/?searchtype=author&query=Samartsev%2C+A">Andrey Samartsev</a>, <a href="/search/?searchtype=author&query=Scherz%2C+A">Andreas Scherz</a>, <a href="/search/?searchtype=author&query=Mercurio%2C+G">Giuseppe Mercurio</a>, <a href="/search/?searchtype=author&query=D%C3%BCrr%2C+H+A">Hermann A. D眉rr</a>, <a href="/search/?searchtype=author&query=Reid%2C+A+H">Alexander H. Reid</a>, <a href="/search/?searchtype=author&query=Arora%2C+M">Monika Arora</a>, <a href="/search/?searchtype=author&query=Nembach%2C+H+T">Hans T. Nembach</a>, <a href="/search/?searchtype=author&query=Shaw%2C+J+M">Justin M. Shaw</a>, <a href="/search/?searchtype=author&query=Jal%2C+E">Emmanuelle Jal</a>, <a href="/search/?searchtype=author&query=Fullerton%2C+E+E">Eric E. Fullerton</a>, <a href="/search/?searchtype=author&query=Keller%2C+M+W">Mark W. Keller</a>, <a href="/search/?searchtype=author&query=Kukreja%2C+R">Roopali Kukreja</a> , et al. (3 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2112.09587v1-abstract-short" style="display: inline;"> Symmetry is a powerful concept in physics, but its applicability to far-from-equilibrium states is still being understood. Recent attention has focused on how far-from-equilibrium states lead to spontaneous symmetry breaking. Conversely, ultrafast optical pumping can be used to drastically change the energy landscape and quench the magnetic order parameter in magnetic systems. Here, we find a dist… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2112.09587v1-abstract-full').style.display = 'inline'; document.getElementById('2112.09587v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2112.09587v1-abstract-full" style="display: none;"> Symmetry is a powerful concept in physics, but its applicability to far-from-equilibrium states is still being understood. Recent attention has focused on how far-from-equilibrium states lead to spontaneous symmetry breaking. Conversely, ultrafast optical pumping can be used to drastically change the energy landscape and quench the magnetic order parameter in magnetic systems. Here, we find a distinct symmetry-dependent ultrafast behaviour by use of ultrafast x-ray scattering from magnetic patterns with varying degrees of isotropic and anisotropic symmetry. After pumping with an optical laser, the scattered intensity reveals a radial shift exclusive to the isotropic component and exhibits a faster recovery time from quenching for the anisotropic component. These features arise even when both symmetry components are concurrently measured, suggesting a correspondence between the excitation and the magnetic order symmetry. Our results underline the importance of symmetry as a critical variable to manipulate the magnetic order in the ultrafast regime. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2112.09587v1-abstract-full').style.display = 'none'; document.getElementById('2112.09587v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 17 December, 2021; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> December 2021. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2111.01649">arXiv:2111.01649</a> <span> [<a href="https://arxiv.org/pdf/2111.01649">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> </div> </div> <p class="title is-5 mathjax"> Non-equilibrium self-assembly of spin-wave solitons in FePt nanoparticles </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/?searchtype=author&query=Turenne%2C+D">D. Turenne</a>, <a href="/search/?searchtype=author&query=Yaroslavtsev%2C+A">A. Yaroslavtsev</a>, <a href="/search/?searchtype=author&query=Wang%2C+X">X. Wang</a>, <a href="/search/?searchtype=author&query=Unikandanuni%2C+V">V. Unikandanuni</a>, <a href="/search/?searchtype=author&query=Vaskivskyi%2C+I">I. Vaskivskyi</a>, <a href="/search/?searchtype=author&query=Schneider%2C+M">M. Schneider</a>, <a href="/search/?searchtype=author&query=Jal%2C+E">E. Jal</a>, <a href="/search/?searchtype=author&query=Carley%2C+R">R. Carley</a>, <a href="/search/?searchtype=author&query=Mercurio%2C+G">G. Mercurio</a>, <a href="/search/?searchtype=author&query=Gort%2C+R">R. Gort</a>, <a href="/search/?searchtype=author&query=Agarwal%2C+N">N. Agarwal</a>, <a href="/search/?searchtype=author&query=Van+Kuiken%2C+B">B. Van Kuiken</a>, <a href="/search/?searchtype=author&query=Mercadier%2C+L">L. Mercadier</a>, <a href="/search/?searchtype=author&query=Schlappa%2C+J">J. Schlappa</a>, <a href="/search/?searchtype=author&query=Guyader%2C+L+L">L. Le Guyader</a>, <a href="/search/?searchtype=author&query=Gerasimova%2C+N">N. Gerasimova</a>, <a href="/search/?searchtype=author&query=Teichmann%2C+M">M. Teichmann</a>, <a href="/search/?searchtype=author&query=Lomidze%2C+D">D. Lomidze</a>, <a href="/search/?searchtype=author&query=Castoldi%2C+A">A. Castoldi</a>, <a href="/search/?searchtype=author&query=Potorochin%2C+D">D. Potorochin</a>, <a href="/search/?searchtype=author&query=Mukkattukavil%2C+D">D. Mukkattukavil</a>, <a href="/search/?searchtype=author&query=Brock%2C+J">J. Brock</a>, <a href="/search/?searchtype=author&query=Hagstr%C3%B6m%2C+N+Z">N. Z. Hagstr枚m</a>, <a href="/search/?searchtype=author&query=Reid%2C+A+H">A. H. Reid</a>, <a href="/search/?searchtype=author&query=Shen%2C+X">X. Shen</a> , et al. (14 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2111.01649v1-abstract-short" style="display: inline;"> Magnetic nanoparticles such as FePt in the L10-phase are the bedrock of our current data storage technology. As the grains become smaller to keep up with technological demands, the superparamagnetic limit calls for materials with higher magneto-crystalline anisotropy. This in turn reduces the magnetic exchange length to just a few nanometers enabling magnetic structures to be induced within the na… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2111.01649v1-abstract-full').style.display = 'inline'; document.getElementById('2111.01649v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2111.01649v1-abstract-full" style="display: none;"> Magnetic nanoparticles such as FePt in the L10-phase are the bedrock of our current data storage technology. As the grains become smaller to keep up with technological demands, the superparamagnetic limit calls for materials with higher magneto-crystalline anisotropy. This in turn reduces the magnetic exchange length to just a few nanometers enabling magnetic structures to be induced within the nanoparticles. Here we describe the existence of spin-wave solitons, dynamic localized bound states of spin-wave excitations, in FePt nanoparticles. We show with time-resolved X-ray diffraction and micromagnetic modeling that spin-wave solitons of sub-10 nm sizes form out of the demagnetized state following femtosecond laser excitation. The measured soliton spin-precession frequency of 0.1 THz positions this system as a platform to develop miniature devices capable of filling the THz gap. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2111.01649v1-abstract-full').style.display = 'none'; document.getElementById('2111.01649v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 2 November, 2021; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 2021. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">32 pages, please check the "attachemnts" tab in the pdf file in order to see the movie</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2107.07528">arXiv:2107.07528</a> <span> [<a href="https://arxiv.org/pdf/2107.07528">pdf</a>, <a href="https://arxiv.org/format/2107.07528">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Methods for Astrophysics">astro-ph.IM</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Astrophysical Phenomena">astro-ph.HE</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1134/S1063778821130020">10.1134/S1063778821130020 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Status of the Yakutsk air shower array and future plans </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/?searchtype=author&query=Alekseev%2C+A+K">A. K. Alekseev</a>, <a href="/search/?searchtype=author&query=Atlasov%2C+E+A">E. A. Atlasov</a>, <a href="/search/?searchtype=author&query=Bolotnikov%2C+N+G">N. G. Bolotnikov</a>, <a href="/search/?searchtype=author&query=Bosikov%2C+A+V">A. V. Bosikov</a>, <a href="/search/?searchtype=author&query=Dyachkovskiy%2C+N+A">N. A. Dyachkovskiy</a>, <a href="/search/?searchtype=author&query=Gerasimova%2C+N+S">N. S. Gerasimova</a>, <a href="/search/?searchtype=author&query=Glushkov%2C+A+V">A. V. Glushkov</a>, <a href="/search/?searchtype=author&query=Ivanov%2C+A+A">A. A. Ivanov</a>, <a href="/search/?searchtype=author&query=Ivanov%2C+O+N">O. N. Ivanov</a>, <a href="/search/?searchtype=author&query=Kardashevsky%2C+D+N">D. N. Kardashevsky</a>, <a href="/search/?searchtype=author&query=Kellarev%2C+I+A">I. A. Kellarev</a>, <a href="/search/?searchtype=author&query=Knurenko%2C+S+P">S. P. Knurenko</a>, <a href="/search/?searchtype=author&query=Krasilnikov%2C+A+D">A. D. Krasilnikov</a>, <a href="/search/?searchtype=author&query=Krivenkov%2C+A+N">A. N. Krivenkov</a>, <a href="/search/?searchtype=author&query=Ksenofontov%2C+I+V">I. V. Ksenofontov</a>, <a href="/search/?searchtype=author&query=Ksenofontov%2C+L+T">L. T. Ksenofontov</a>, <a href="/search/?searchtype=author&query=Lebedev%2C+K+G">K. G. Lebedev</a>, <a href="/search/?searchtype=author&query=Matarkin%2C+S+V">S. V. Matarkin</a>, <a href="/search/?searchtype=author&query=Mokhnachevskaya%2C+V+P">V. P. Mokhnachevskaya</a>, <a href="/search/?searchtype=author&query=Nikolaeva%2C+E+V">E. V. Nikolaeva</a>, <a href="/search/?searchtype=author&query=Neustroev%2C+N+I">N. I. Neustroev</a>, <a href="/search/?searchtype=author&query=Petrov%2C+I+S">I. S. Petrov</a>, <a href="/search/?searchtype=author&query=Platonov%2C+N+D">N. D. Platonov</a>, <a href="/search/?searchtype=author&query=Proshutinsky%2C+A+S">A. S. Proshutinsky</a>, <a href="/search/?searchtype=author&query=Sabourov%2C+A+V">A. V. Sabourov</a> , et al. (4 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2107.07528v1-abstract-short" style="display: inline;"> The Yakutsk Extensive Air Shower Array has been continuously operating for more than 50 years (since 1970) and up until recently it has been one of world's largest ground-based instruments aimed at studying the properties of cosmic rays in the ultra-high energy domain. In this report we discuss results recently obtained at the array - on cosmic rays energy spectrum, mass composition and directiona… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2107.07528v1-abstract-full').style.display = 'inline'; document.getElementById('2107.07528v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2107.07528v1-abstract-full" style="display: none;"> The Yakutsk Extensive Air Shower Array has been continuously operating for more than 50 years (since 1970) and up until recently it has been one of world's largest ground-based instruments aimed at studying the properties of cosmic rays in the ultra-high energy domain. In this report we discuss results recently obtained at the array - on cosmic rays energy spectrum, mass composition and directional anisotropy - and how they fit into the world data. Special attention is paid to the measurements of muonic component of extensive air showers. Theoretical results of particle acceleration at shocks are also briefly reviewed. Future scientific and engineering plans on the array modernization are discussed. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2107.07528v1-abstract-full').style.display = 'none'; document.getElementById('2107.07528v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 15 July, 2021; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 2021. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">24 pages, 7 figures. Accepted for publication in Physics of Atomic Nuclei. For color figures see ISCRA-2021 contribution: https://indico.nevod.mephi.ru/event/6/contributions/161/</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Physics of Atomic Nuclei 2021 V.84 P.893 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2104.11136">arXiv:2104.11136</a> <span> [<a href="https://arxiv.org/pdf/2104.11136">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Optics">physics.optics</span> </div> </div> <p class="title is-5 mathjax"> High spatial coherence and short pulse duration revealed by the Hanbury Brown and Twiss interferometry at the European XFEL </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/?searchtype=author&query=Khubbutdinov%2C+R">Ruslan Khubbutdinov</a>, <a href="/search/?searchtype=author&query=Gerasimova%2C+N">Natalia Gerasimova</a>, <a href="/search/?searchtype=author&query=Mercurio%2C+G">Giuseppe Mercurio</a>, <a href="/search/?searchtype=author&query=Assalauova%2C+D">Dameli Assalauova</a>, <a href="/search/?searchtype=author&query=Carnis%2C+J">Jerome Carnis</a>, <a href="/search/?searchtype=author&query=Gelisio%2C+L">Luca Gelisio</a>, <a href="/search/?searchtype=author&query=Guyader%2C+L+l">Lo茂c le Guyader</a>, <a href="/search/?searchtype=author&query=Ignatenko%2C+A">Alexandr Ignatenko</a>, <a href="/search/?searchtype=author&query=Kim%2C+Y+Y">Young Yong Kim</a>, <a href="/search/?searchtype=author&query=van+Kuiken%2C+B">Benjamin van Kuiken</a>, <a href="/search/?searchtype=author&query=Kurta%2C+R+P">Ruslan P. Kurta</a>, <a href="/search/?searchtype=author&query=Lapkin%2C+D">Dmitry Lapkin</a>, <a href="/search/?searchtype=author&query=Teichmann%2C+M">Martin Teichmann</a>, <a href="/search/?searchtype=author&query=Yaroslavtsev%2C+A">Alexander Yaroslavtsev</a>, <a href="/search/?searchtype=author&query=Gorobtsov%2C+O">Oleg Gorobtsov</a>, <a href="/search/?searchtype=author&query=Menushenkov%2C+A+P">Aleksey P. Menushenkov</a>, <a href="/search/?searchtype=author&query=Scholz%2C+M">Matthias Scholz</a>, <a href="/search/?searchtype=author&query=Scherz%2C+A">Andreas Scherz</a>, <a href="/search/?searchtype=author&query=Vartanyants%2C+I+A">Ivan A. Vartanyants</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2104.11136v1-abstract-short" style="display: inline;"> Second-order intensity interferometry was employed to study the spatial and temporal properties of the European X-ray Free-Electron Laser (EuXFEL). Measurements were performed at the soft X-ray SASE3 undulator beamline at a photon energy of 1.2 keV in the Self-Amplified Spontaneous Emission (SASE) mode. Two high-power regimes of the SASE3 undulator settings, i.e. linear and quadratic tapering at s… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2104.11136v1-abstract-full').style.display = 'inline'; document.getElementById('2104.11136v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2104.11136v1-abstract-full" style="display: none;"> Second-order intensity interferometry was employed to study the spatial and temporal properties of the European X-ray Free-Electron Laser (EuXFEL). Measurements were performed at the soft X-ray SASE3 undulator beamline at a photon energy of 1.2 keV in the Self-Amplified Spontaneous Emission (SASE) mode. Two high-power regimes of the SASE3 undulator settings, i.e. linear and quadratic tapering at saturation, were studied in detail and compared with the linear gain regime. The statistical analysis showed an exceptionally high degree of spatial coherence up to 90% for the linear undulator tapering. Analysis of the measured data in spectral and spatial domains provided an average pulse duration of about 10 fs in our measurements. The obtained results will be valuable for the experiments requiring and exploiting short pulse duration and utilizing high coherence properties of the EuXFEL. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2104.11136v1-abstract-full').style.display = 'none'; document.getElementById('2104.11136v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 22 April, 2021; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> April 2021. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">12 pages, 6 figures, 2 tables</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2104.00384">arXiv:2104.00384</a> <span> [<a href="https://arxiv.org/pdf/2104.00384">pdf</a>, <a href="https://arxiv.org/ps/2104.00384">ps</a>, <a href="https://arxiv.org/format/2104.00384">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Accelerator Physics">physics.acc-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Optics">physics.optics</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevAccelBeams.24.030701">10.1103/PhysRevAccelBeams.24.030701 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Observation of harmonic lasing in the Angstrom regime at European XFEL </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/?searchtype=author&query=Schneidmiller%2C+E+A">E. A. Schneidmiller</a>, <a href="/search/?searchtype=author&query=Brinker%2C+F">F. Brinker</a>, <a href="/search/?searchtype=author&query=Decking%2C+W">W. Decking</a>, <a href="/search/?searchtype=author&query=Froehlich%2C+L">L. Froehlich</a>, <a href="/search/?searchtype=author&query=Guetg%2C+M">M. Guetg</a>, <a href="/search/?searchtype=author&query=Noelle%2C+D">D. Noelle</a>, <a href="/search/?searchtype=author&query=Scholz%2C+M">M. Scholz</a>, <a href="/search/?searchtype=author&query=Yurkov%2C+M+V">M. V. Yurkov</a>, <a href="/search/?searchtype=author&query=Zagorodnov%2C+I">I. Zagorodnov</a>, <a href="/search/?searchtype=author&query=Geloni%2C+G">G. Geloni</a>, <a href="/search/?searchtype=author&query=Gerasimova%2C+N">N. Gerasimova</a>, <a href="/search/?searchtype=author&query=Gruenert%2C+J">J. Gruenert</a>, <a href="/search/?searchtype=author&query=Laksman%2C+J">J. Laksman</a>, <a href="/search/?searchtype=author&query=Liu%2C+J">J. Liu</a>, <a href="/search/?searchtype=author&query=Karabekyan%2C+S">S. Karabekyan</a>, <a href="/search/?searchtype=author&query=Kujala%2C+N">N. Kujala</a>, <a href="/search/?searchtype=author&query=Maltezopoulos%2C+T">Th. Maltezopoulos</a>, <a href="/search/?searchtype=author&query=Petrov%2C+I">I. Petrov</a>, <a href="/search/?searchtype=author&query=Samoylova%2C+L">L. Samoylova</a>, <a href="/search/?searchtype=author&query=Serkez%2C+S">S. Serkez</a>, <a href="/search/?searchtype=author&query=Sinn%2C+H">H. Sinn</a>, <a href="/search/?searchtype=author&query=Wolff-Fabris%2C+F">F. Wolff-Fabris</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2104.00384v1-abstract-short" style="display: inline;"> Harmonic lasing provides an opportunity to extend the photon energy range of existing and planned X-ray FEL user facilities. Contrary to nonlinear harmonic generation, harmonic lasing can generate a much more intense, stable, and narrow-band FEL beam. Another interesting application is Harmonic Lasing Self-Seeding (HLSS) that allows to improve the longitudinal coherence and spectral power of a Sel… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2104.00384v1-abstract-full').style.display = 'inline'; document.getElementById('2104.00384v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2104.00384v1-abstract-full" style="display: none;"> Harmonic lasing provides an opportunity to extend the photon energy range of existing and planned X-ray FEL user facilities. Contrary to nonlinear harmonic generation, harmonic lasing can generate a much more intense, stable, and narrow-band FEL beam. Another interesting application is Harmonic Lasing Self-Seeding (HLSS) that allows to improve the longitudinal coherence and spectral power of a Self-Amplified Spontaneous Emission (SASE) FEL. This concept was tested at FLASH in the range of 4.5 - 15 nm and at PAL XFEL at 1 nm. In this paper we present recent results from the European XFEL where we successfully demonstrated harmonic lasing at 5.9 Angstrom and 2.8 Angstrom. In the latter case we obtained both 3rd and 5th harmonic lasing and, for the first time, operated a harmonic lasing cascade (5th-3rd-1st harmonics of the undulator). These results pave the way for reaching very high photon energies, up to 100 keV. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2104.00384v1-abstract-full').style.display = 'none'; document.getElementById('2104.00384v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 1 April, 2021; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> April 2021. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">arXiv admin note: text overlap with arXiv:1612.03635</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> DESY 21-036 </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Published 19 March 2021 in Phys. Rev. Accel. Beams 24, 030701 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1811.11446">arXiv:1811.11446</a> <span> [<a href="https://arxiv.org/pdf/1811.11446">pdf</a>, <a href="https://arxiv.org/format/1811.11446">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Optics">physics.optics</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Accelerator Physics">physics.acc-ph</span> </div> </div> <p class="title is-5 mathjax"> ROSA: Reconstruction of Spectrogram Autocorrelation for Self-Amplified Spontaneous Emission Free-Electron Lasers </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/?searchtype=author&query=Serkez%2C+S">Svitozar Serkez</a>, <a href="/search/?searchtype=author&query=Gorobtsov%2C+O">Oleg Gorobtsov</a>, <a href="/search/?searchtype=author&query=Sobko%2C+B">Bohdana Sobko</a>, <a href="/search/?searchtype=author&query=Gerasimova%2C+N">Natalia Gerasimova</a>, <a href="/search/?searchtype=author&query=Geloni%2C+G">Gianluca Geloni</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1811.11446v1-abstract-short" style="display: inline;"> In recent years X-ray Free Electron Lasers (XFELs) proved to be unmatched sources of ultrashort pulses of spatially coherent quasimonochromatic X-ray radiation. Diagnostics of XFEL emission properties, in particular pulse duration, spectrum and temporal profile is extremely important in order to analyze the experimental results. In this paper we propose a cost-effective method to examine these pro… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1811.11446v1-abstract-full').style.display = 'inline'; document.getElementById('1811.11446v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1811.11446v1-abstract-full" style="display: none;"> In recent years X-ray Free Electron Lasers (XFELs) proved to be unmatched sources of ultrashort pulses of spatially coherent quasimonochromatic X-ray radiation. Diagnostics of XFEL emission properties, in particular pulse duration, spectrum and temporal profile is extremely important in order to analyze the experimental results. In this paper we propose a cost-effective method to examine these properties of Self-Amplified Spontaneous Emission (SASE) pulses. It only requires an ensemble of measured SASE spectra and provides the temporal autocorrelation of the ensemble-averaged Wigner distribution of SASE FEL pulses. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1811.11446v1-abstract-full').style.display = 'none'; document.getElementById('1811.11446v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 28 November, 2018; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 2018. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1611.03996">arXiv:1611.03996</a> <span> [<a href="https://arxiv.org/pdf/1611.03996">pdf</a>, <a href="https://arxiv.org/format/1611.03996">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Optics">physics.optics</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevA.95.023843">10.1103/PhysRevA.95.023843 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Statistical properties of a free-electron laser revealed by the Hanbury Brown and Twiss interferometry </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/?searchtype=author&query=Gorobtsov%2C+O+Y">O. Yu. Gorobtsov</a>, <a href="/search/?searchtype=author&query=Mercurio%2C+G">G. Mercurio</a>, <a href="/search/?searchtype=author&query=Brenner%2C+G">G. Brenner</a>, <a href="/search/?searchtype=author&query=Lorenz%2C+U">U. Lorenz</a>, <a href="/search/?searchtype=author&query=Gerasimova%2C+N">N. Gerasimova</a>, <a href="/search/?searchtype=author&query=Kurta%2C+R+P">R. P. Kurta</a>, <a href="/search/?searchtype=author&query=Hieke%2C+F">F. Hieke</a>, <a href="/search/?searchtype=author&query=Skopintsev%2C+P">P. Skopintsev</a>, <a href="/search/?searchtype=author&query=Zaluzhnyy%2C+I">I. Zaluzhnyy</a>, <a href="/search/?searchtype=author&query=Lazarev%2C+S">S. Lazarev</a>, <a href="/search/?searchtype=author&query=Dzhigaev%2C+D">D. Dzhigaev</a>, <a href="/search/?searchtype=author&query=Rose%2C+M">M. Rose</a>, <a href="/search/?searchtype=author&query=Singer%2C+A">A. Singer</a>, <a href="/search/?searchtype=author&query=Wurth%2C+W">W. Wurth</a>, <a href="/search/?searchtype=author&query=Vartanyants%2C+I+A">I. A. Vartanyants</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1611.03996v1-abstract-short" style="display: inline;"> We present a comprehensive experimental analysis of statistical properties of the self-amplified spontaneous emission (SASE) free-electron laser (FEL) FLASH at DESY in Hamburg by means of Hanbury Brown and Twiss (HBT) interferometry. The experiments were performed at the FEL wavelengths of 5.5 nm, 13.4 nm, and 20.8 nm. We determined the 2-nd order intensity correlation function for all wavelengths… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1611.03996v1-abstract-full').style.display = 'inline'; document.getElementById('1611.03996v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1611.03996v1-abstract-full" style="display: none;"> We present a comprehensive experimental analysis of statistical properties of the self-amplified spontaneous emission (SASE) free-electron laser (FEL) FLASH at DESY in Hamburg by means of Hanbury Brown and Twiss (HBT) interferometry. The experiments were performed at the FEL wavelengths of 5.5 nm, 13.4 nm, and 20.8 nm. We determined the 2-nd order intensity correlation function for all wavelengths and different operation conditions of FLASH. In all experiments a high degree of spatial coherence (above 50%) was obtained. Our analysis performed in spatial and spectral domains provided us with the independent measurements of an average pulse duration of the FEL that were below 60 fs. To explain complicated behaviour of the 2-nd order intensity correlation function we developed advanced theoretical model that includes the presence of multiple beams and external positional jitter of the FEL pulses. By this analysis we determined that in most experiments several beams were present in radiating field and in one of the experiments external positional jitter was about 25% of the beam size. We envision that methods developed in our study will be used widely for analysis and diagnostics of the FEL radiation. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1611.03996v1-abstract-full').style.display = 'none'; document.getElementById('1611.03996v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 12 November, 2016; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 2016. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">29 pages, 14 figures, 3 tables</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. A 95, 023843 (2017) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1301.6654">arXiv:1301.6654</a> <span> [<a href="https://arxiv.org/pdf/1301.6654">pdf</a>, <a href="https://arxiv.org/ps/1301.6654">ps</a>, <a href="https://arxiv.org/format/1301.6654">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Optics">physics.optics</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevLett.111.034802">10.1103/PhysRevLett.111.034802 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Hanbury Brown and Twiss interferometry at a free-electron laser </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/?searchtype=author&query=Singer%2C+A">A. Singer</a>, <a href="/search/?searchtype=author&query=Lorenz%2C+U">U. Lorenz</a>, <a href="/search/?searchtype=author&query=Sorgenfrei%2C+F">F. Sorgenfrei</a>, <a href="/search/?searchtype=author&query=Gerasimova%2C+N">N. Gerasimova</a>, <a href="/search/?searchtype=author&query=Gulden%2C+J">J. Gulden</a>, <a href="/search/?searchtype=author&query=Yefanov%2C+O+M">O. M. Yefanov</a>, <a href="/search/?searchtype=author&query=Kurta%2C+R+P">R. P. Kurta</a>, <a href="/search/?searchtype=author&query=Shabalin%2C+A">A. Shabalin</a>, <a href="/search/?searchtype=author&query=Dronyak%2C+R">R. Dronyak</a>, <a href="/search/?searchtype=author&query=Treusch%2C+R">R. Treusch</a>, <a href="/search/?searchtype=author&query=Kocharyan%2C+V">V. Kocharyan</a>, <a href="/search/?searchtype=author&query=Weckert%2C+E">E. Weckert</a>, <a href="/search/?searchtype=author&query=Wurth%2C+W">W. Wurth</a>, <a href="/search/?searchtype=author&query=Vartanyants%2C+I+A">I. A. Vartanyants</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1301.6654v1-abstract-short" style="display: inline;"> We present measurements of second- and higher-order intensity correlation functions (so-called Hanbury Brown and Twiss experiment) performed at the free-electron laser (FEL) FLASH in the non-linear regime of its operation. We demonstrate the high transverse coherence properties of the FEL beam with a degree of transverse coherence of about 80% and degeneracy parameter of the order 10^9 that makes… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1301.6654v1-abstract-full').style.display = 'inline'; document.getElementById('1301.6654v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1301.6654v1-abstract-full" style="display: none;"> We present measurements of second- and higher-order intensity correlation functions (so-called Hanbury Brown and Twiss experiment) performed at the free-electron laser (FEL) FLASH in the non-linear regime of its operation. We demonstrate the high transverse coherence properties of the FEL beam with a degree of transverse coherence of about 80% and degeneracy parameter of the order 10^9 that makes it similar to laser sources. Intensity correlation measurements in spatial and frequency domain gave an estimate of the FEL average pulse duration of 50 fs. Our measurements of the higher-order correlation functions indicate that FEL radiation obeys Gaussian statistics, which is characteristic to chaotic sources. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1301.6654v1-abstract-full').style.display = 'none'; document.getElementById('1301.6654v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 28 January, 2013; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> January 2013. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">19 pages, 6 figures, 1 table, 40 references</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. Lett. v. 111, 034802 (2013) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1301.4087">arXiv:1301.4087</a> <span> [<a href="https://arxiv.org/pdf/1301.4087">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Accelerator Physics">physics.acc-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Optics">physics.optics</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1080/09500340.2011.588344">10.1080/09500340.2011.588344 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> The monochromator beamline at FLASH: performance, capabilities and upgrade plans </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/?searchtype=author&query=Gerasimova%2C+N">Natalia Gerasimova</a>, <a href="/search/?searchtype=author&query=Dziarzhytski%2C+S">Siarhei Dziarzhytski</a>, <a href="/search/?searchtype=author&query=Feldhaus%2C+J">Josef Feldhaus</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1301.4087v1-abstract-short" style="display: inline;"> The monochromator beamline at the FLASH facility at DESY is the worldwide first XUV monochromator beamline operational on a free electron laser (FEL)source. Being a single-user machine, FLASH demands a high flexibility of the instrumentation to fulfil the needs of diverse experiments performed by a multidisciplinary user community. Thus, the beamline has not only been used for high-resolution spec… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1301.4087v1-abstract-full').style.display = 'inline'; document.getElementById('1301.4087v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1301.4087v1-abstract-full" style="display: none;"> The monochromator beamline at the FLASH facility at DESY is the worldwide first XUV monochromator beamline operational on a free electron laser (FEL)source. Being a single-user machine, FLASH demands a high flexibility of the instrumentation to fulfil the needs of diverse experiments performed by a multidisciplinary user community. Thus, the beamline has not only been used for high-resolution spectroscopy that it was originally designed for, but also for pump-probe experiments controlling the temporal-spectral properties at moderate resolution, and as a filter for high harmonics of the FEL at very low resolution. The present performance and capabilities of the beamline are discussed with emphasis on particularities arising from the nature of the FEL source, and current developments are presented aiming to enhance its capabilities for accommodating a wide variety of experiments. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1301.4087v1-abstract-full').style.display = 'none'; document.getElementById('1301.4087v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 17 January, 2013; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> January 2013. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Journal of Modern Optics, v.58, 16 (2011), pp. 1480-1485 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1206.1091">arXiv:1206.1091</a> <span> [<a href="https://arxiv.org/pdf/1206.1091">pdf</a>, <a href="https://arxiv.org/ps/1206.1091">ps</a>, <a href="https://arxiv.org/format/1206.1091">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Optics">physics.optics</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1364/OE.20.017480">10.1364/OE.20.017480 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Spatial and temporal coherence properties of single free-electron laser pulses </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/?searchtype=author&query=Singer%2C+A">A. Singer</a>, <a href="/search/?searchtype=author&query=Sorgenfrei%2C+F">F. Sorgenfrei</a>, <a href="/search/?searchtype=author&query=Mancuso%2C+A+P">A. P. Mancuso</a>, <a href="/search/?searchtype=author&query=Gerasimova%2C+N">N. Gerasimova</a>, <a href="/search/?searchtype=author&query=Yefanov%2C+O+M">O. M. Yefanov</a>, <a href="/search/?searchtype=author&query=Gulden%2C+J">J. Gulden</a>, <a href="/search/?searchtype=author&query=Gorniak%2C+T">T. Gorniak</a>, <a href="/search/?searchtype=author&query=Senkbeil%2C+T">T. Senkbeil</a>, <a href="/search/?searchtype=author&query=Sakdinawat%2C+A">A. Sakdinawat</a>, <a href="/search/?searchtype=author&query=Liu%2C+Y">Y. Liu</a>, <a href="/search/?searchtype=author&query=Attwood%2C+D">D. Attwood</a>, <a href="/search/?searchtype=author&query=Dziarzhytski%2C+S">S. Dziarzhytski</a>, <a href="/search/?searchtype=author&query=Mai%2C+D+D">D. D. Mai</a>, <a href="/search/?searchtype=author&query=Treusch%2C+R">R. Treusch</a>, <a href="/search/?searchtype=author&query=Weckert%2C+E">E. Weckert</a>, <a href="/search/?searchtype=author&query=Salditt%2C+T">T. Salditt</a>, <a href="/search/?searchtype=author&query=Rosenhahn%2C+A">A. Rosenhahn</a>, <a href="/search/?searchtype=author&query=Wurth%2C+W">W. Wurth</a>, <a href="/search/?searchtype=author&query=Vartanyants%2C+I+A">I. A. Vartanyants</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1206.1091v1-abstract-short" style="display: inline;"> The experimental characterization of the spatial and temporal coherence properties of the free-electron laser in Hamburg (FLASH) at a wavelength of 8.0 nm is presented. Double pinhole diffraction patterns of single femtosecond pulses focused to a size of about 10 microns by 10 microns were measured. A transverse coherence length of 6.2 microns in the horizontal and 8.7 microns in the vertical dire… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1206.1091v1-abstract-full').style.display = 'inline'; document.getElementById('1206.1091v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1206.1091v1-abstract-full" style="display: none;"> The experimental characterization of the spatial and temporal coherence properties of the free-electron laser in Hamburg (FLASH) at a wavelength of 8.0 nm is presented. Double pinhole diffraction patterns of single femtosecond pulses focused to a size of about 10 microns by 10 microns were measured. A transverse coherence length of 6.2 microns in the horizontal and 8.7 microns in the vertical direction was determined from the most coherent pulses. Using a split and delay unit the coherence time of the pulses produced in the same operation conditions of FLASH was measured to be 1.75 fs. From our experiment we estimated the degeneracy parameter of the FLASH beam to be on the order of $10^{10}$ to $10^{11}$, which exceeds the values of this parameter at any other source in the same energy range by many orders of magnitude. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1206.1091v1-abstract-full').style.display = 'none'; document.getElementById('1206.1091v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 5 June, 2012; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> June 2012. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">16 pages, 7 figures, 1 table</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1201.4316">arXiv:1201.4316</a> <span> [<a href="https://arxiv.org/pdf/1201.4316">pdf</a>, <a href="https://arxiv.org/format/1201.4316">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Accelerator Physics">physics.acc-ph</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevSTAB.15.030707">10.1103/PhysRevSTAB.15.030707 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Constraints on photon pulse duration from longitudinal electron beam diagnostics at a soft X-ray free-electron laser </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/?searchtype=author&query=Behrens%2C+C">C. Behrens</a>, <a href="/search/?searchtype=author&query=Gerasimova%2C+N">N. Gerasimova</a>, <a href="/search/?searchtype=author&query=Gerth%2C+C">Ch. Gerth</a>, <a href="/search/?searchtype=author&query=Schmidt%2C+B">B. Schmidt</a>, <a href="/search/?searchtype=author&query=Schneidmiller%2C+E+A">E. A. Schneidmiller</a>, <a href="/search/?searchtype=author&query=Serkez%2C+S">S. Serkez</a>, <a href="/search/?searchtype=author&query=Wesch%2C+S">S. Wesch</a>, <a href="/search/?searchtype=author&query=Yurkov%2C+M+V">M. V. Yurkov</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1201.4316v2-abstract-short" style="display: inline;"> The successful operation of X-ray free-electron lasers (FELs), like the Linac Coherent Light Source or the Free-Electron Laser in Hamburg (FLASH), makes unprecedented research on matter at atomic length and ultrafast time scales possible. However, in order to take advantage of these unique light sources and to meet the strict requirements of many experiments in photon science, FEL photon pulse dur… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1201.4316v2-abstract-full').style.display = 'inline'; document.getElementById('1201.4316v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1201.4316v2-abstract-full" style="display: none;"> The successful operation of X-ray free-electron lasers (FELs), like the Linac Coherent Light Source or the Free-Electron Laser in Hamburg (FLASH), makes unprecedented research on matter at atomic length and ultrafast time scales possible. However, in order to take advantage of these unique light sources and to meet the strict requirements of many experiments in photon science, FEL photon pulse durations need to be known and tunable. This can be achieved by controlling the FEL driving electron beams, and high-resolution longitudinal electron beam diagnostics can be utilized to provide constraints on the expected FEL photon pulse durations. In this paper, we present comparative measurements of soft X-ray pulse durations and electron bunch lengths at FLASH. The soft X-ray pulse durations were measured by FEL radiation pulse energy statistics and compared to electron bunch lengths determined by frequency-domain spectroscopy of coherent transition radiation in the terahertz range and time-domain longitudinal phase space measurements. The experimental results, theoretical considerations, and simulations show that high-resolution longitudinal electron beam diagnostics provide reasonable constraints on the expected FEL photon pulse durations. In addition, we demonstrated the generation of soft X-ray pulses with durations below 50 fs (FWHM) after the implementation of the new uniform electron bunch compression scheme used at FLASH. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1201.4316v2-abstract-full').style.display = 'none'; document.getElementById('1201.4316v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 6 March, 2012; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 20 January, 2012; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> January 2012. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">12 pages, 9 figures, accepted for publication in Phys. Rev. ST Accel. Beams</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. ST Accel. Beams 15, 030707 (2012) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/astro-ph/0507681">arXiv:astro-ph/0507681</a> <span> [<a href="https://arxiv.org/pdf/astro-ph/0507681">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Astrophysics">astro-ph</span> </div> </div> <p class="title is-5 mathjax"> Estimate of the Mass Composition of Ultrahigh Energy Cosmic Rays </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/?searchtype=author&query=Mikhailov%2C+A+A">A. A. Mikhailov</a>, <a href="/search/?searchtype=author&query=Efremov%2C+N+N">N. N. Efremov</a>, <a href="/search/?searchtype=author&query=Gerasimova%2C+N+S">N. S. Gerasimova</a>, <a href="/search/?searchtype=author&query=Makarov%2C+I+T">I. T. Makarov</a>, <a href="/search/?searchtype=author&query=Nikolayeva%2C+G+V">G. V. Nikolayeva</a>, <a href="/search/?searchtype=author&query=Struchkov%2C+G+G">G. G. Struchkov</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="astro-ph/0507681v1-abstract-short" style="display: inline;"> It is proposed a new approach for estimating the composition of cosmic rays. It is found that the zenith angle distributions and muon components of EAS for energies E>10^19 eV and E>4.10^19 eV differ from each other. It is shown that the cosmic rays above E>4.10^19 eV is heavier than the cosmic rays at energy E~ 10^19 eV. According to our estimation the SUGAR array detected 8 showers above 10^20… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('astro-ph/0507681v1-abstract-full').style.display = 'inline'; document.getElementById('astro-ph/0507681v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="astro-ph/0507681v1-abstract-full" style="display: none;"> It is proposed a new approach for estimating the composition of cosmic rays. It is found that the zenith angle distributions and muon components of EAS for energies E>10^19 eV and E>4.10^19 eV differ from each other. It is shown that the cosmic rays above E>4.10^19 eV is heavier than the cosmic rays at energy E~ 10^19 eV. According to our estimation the SUGAR array detected 8 showers above 10^20 eV. It is concluded that no sign of Greisen-Zatsepin-Kuzmin (GZK) cut off in the spectrum of cosmic rays and all cosmic rays are galactic. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('astro-ph/0507681v1-abstract-full').style.display = 'none'; document.getElementById('astro-ph/0507681v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 28 July, 2005; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 2005. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">4 pages, 4 figures, the paper will be publish in Proc. ICRC, Pune, India, 2005</span> </p> </li> </ol> <div class="is-hidden-tablet">  <span class="help" style="display: inline-block;"><a href="https://github.com/arXiv/arxiv-search/releases">Search v0.5.6 released 2020-02-24</a>  </span> </div> </div> </main> <footer> <div class="columns is-desktop" role="navigation" aria-label="Secondary">  <div class="column"> <div class="columns"> <div class="column"> <ul class="nav-spaced"> <li><a href="https://info.arxiv.org/about">About</a></li> <li><a href="https://info.arxiv.org/help">Help</a></li> </ul> </div> <div class="column"> <ul class="nav-spaced"> <li> <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512" class="icon filter-black" role="presentation"><title>contact arXiv</title><desc>Click here to contact arXiv</desc><path d="M502.3 190.8c3.9-3.1 9.7-.2 9.7 4.7V400c0 26.5-21.5 48-48 48H48c-26.5 0-48-21.5-48-48V195.6c0-5 5.7-7.8 9.7-4.7 22.4 17.4 52.1 39.5 154.1 113.6 21.1 15.4 56.7 47.8 92.2 47.6 35.7.3 72-32.8 92.3-47.6 102-74.1 131.6-96.3 154-113.7zM256 320c23.2.4 56.6-29.2 73.4-41.4 132.7-96.3 142.8-104.7 173.4-128.7 5.8-4.5 9.2-11.5 9.2-18.9v-19c0-26.5-21.5-48-48-48H48C21.5 64 0 85.5 0 112v19c0 7.4 3.4 14.3 9.2 18.9 30.6 23.9 40.7 32.4 173.4 128.7 16.8 12.2 50.2 41.8 73.4 41.4z"/></svg> <a href="https://info.arxiv.org/help/contact.html"> Contact</a> </li> <li> <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512" class="icon filter-black" role="presentation"><title>subscribe to arXiv mailings</title><desc>Click here to subscribe</desc><path d="M476 3.2L12.5 270.6c-18.1 10.4-15.8 35.6 2.2 43.2L121 358.4l287.3-253.2c5.5-4.9 13.3 2.6 8.6 8.3L176 407v80.5c0 23.6 28.5 32.9 42.5 15.8L282 426l124.6 52.2c14.2 6 30.4-2.9 33-18.2l72-432C515 7.8 493.3-6.8 476 3.2z"/></svg> <a href="https://info.arxiv.org/help/subscribe"> Subscribe</a> </li> </ul> </div> </div> </div>   <div class="column"> <div class="columns"> <div class="column"> <ul class="nav-spaced"> <li><a href="https://info.arxiv.org/help/license/index.html">Copyright</a></li> <li><a href="https://info.arxiv.org/help/policies/privacy_policy.html">Privacy Policy</a></li> </ul> </div> <div class="column sorry-app-links"> <ul class="nav-spaced"> <li><a href="https://info.arxiv.org/help/web_accessibility.html">Web Accessibility Assistance</a></li> <li> <p class="help"> <a class="a11y-main-link" href="https://status.arxiv.org" target="_blank">arXiv Operational Status <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 256 512" class="icon filter-dark_grey" role="presentation"><path d="M224.3 273l-136 136c-9.4 9.4-24.6 9.4-33.9 0l-22.6-22.6c-9.4-9.4-9.4-24.6 0-33.9l96.4-96.4-96.4-96.4c-9.4-9.4-9.4-24.6 0-33.9L54.3 103c9.4-9.4 24.6-9.4 33.9 0l136 136c9.5 9.4 9.5 24.6.1 34z"/></svg></a><br> Get status notifications via <a class="is-link" href="https://subscribe.sorryapp.com/24846f03/email/new" target="_blank"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512" class="icon filter-black" role="presentation"><path d="M502.3 190.8c3.9-3.1 9.7-.2 9.7 4.7V400c0 26.5-21.5 48-48 48H48c-26.5 0-48-21.5-48-48V195.6c0-5 5.7-7.8 9.7-4.7 22.4 17.4 52.1 39.5 154.1 113.6 21.1 15.4 56.7 47.8 92.2 47.6 35.7.3 72-32.8 92.3-47.6 102-74.1 131.6-96.3 154-113.7zM256 320c23.2.4 56.6-29.2 73.4-41.4 132.7-96.3 142.8-104.7 173.4-128.7 5.8-4.5 9.2-11.5 9.2-18.9v-19c0-26.5-21.5-48-48-48H48C21.5 64 0 85.5 0 112v19c0 7.4 3.4 14.3 9.2 18.9 30.6 23.9 40.7 32.4 173.4 128.7 16.8 12.2 50.2 41.8 73.4 41.4z"/></svg>email</a> or <a class="is-link" href="https://subscribe.sorryapp.com/24846f03/slack/new" target="_blank"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 448 512" class="icon filter-black" role="presentation"><path d="M94.12 315.1c0 25.9-21.16 47.06-47.06 47.06S0 341 0 315.1c0-25.9 21.16-47.06 47.06-47.06h47.06v47.06zm23.72 0c0-25.9 21.16-47.06 47.06-47.06s47.06 21.16 47.06 47.06v117.84c0 25.9-21.16 47.06-47.06 47.06s-47.06-21.16-47.06-47.06V315.1zm47.06-188.98c-25.9 0-47.06-21.16-47.06-47.06S139 32 164.9 32s47.06 21.16 47.06 47.06v47.06H164.9zm0 23.72c25.9 0 47.06 21.16 47.06 47.06s-21.16 47.06-47.06 47.06H47.06C21.16 243.96 0 222.8 0 196.9s21.16-47.06 47.06-47.06H164.9zm188.98 47.06c0-25.9 21.16-47.06 47.06-47.06 25.9 0 47.06 21.16 47.06 47.06s-21.16 47.06-47.06 47.06h-47.06V196.9zm-23.72 0c0 25.9-21.16 47.06-47.06 47.06-25.9 0-47.06-21.16-47.06-47.06V79.06c0-25.9 21.16-47.06 47.06-47.06 25.9 0 47.06 21.16 47.06 47.06V196.9zM283.1 385.88c25.9 0 47.06 21.16 47.06 47.06 0 25.9-21.16 47.06-47.06 47.06-25.9 0-47.06-21.16-47.06-47.06v-47.06h47.06zm0-23.72c-25.9 0-47.06-21.16-47.06-47.06 0-25.9 21.16-47.06 47.06-47.06h117.84c25.9 0 47.06 21.16 47.06 47.06 0 25.9-21.16 47.06-47.06 47.06H283.1z"/></svg>slack</a> </p> </li> </ul> </div> </div> </div>  </div> </footer> <script src="https://static.arxiv.org/static/base/1.0.0a5/js/member_acknowledgement.js"></script> </body> </html>

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