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</div> <div class="control"> <button class="button is-small is-link">Go</button> </div> </div> </form> </div> </div> <ol class="breathe-horizontal" start="1"> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2301.01525">arXiv:2301.01525</a> <span> [<a href="https://arxiv.org/pdf/2301.01525">pdf</a>, <a href="https://arxiv.org/format/2301.01525">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> <p class="title is-5 mathjax"> ASCENT - A balloon-borne hard X-ray imaging spectroscopy telescope using transition edge sensor microcalorimeter detectors </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/astro-ph?searchtype=author&query=Kislat%2C+F">Fabian Kislat</a>, <a href="/search/astro-ph?searchtype=author&query=Becker%2C+D">Daniel Becker</a>, <a href="/search/astro-ph?searchtype=author&query=Bennett%2C+D">Douglas Bennett</a>, <a href="/search/astro-ph?searchtype=author&query=Dasgupta%2C+A">Adrika Dasgupta</a>, <a href="/search/astro-ph?searchtype=author&query=Fowler%2C+J">Joseph Fowler</a>, <a href="/search/astro-ph?searchtype=author&query=Fryer%2C+C+L">Christopher L. Fryer</a>, <a href="/search/astro-ph?searchtype=author&query=Gard%2C+J">Johnathon Gard</a>, <a href="/search/astro-ph?searchtype=author&query=Gau%2C+E">Ephraim Gau</a>, <a href="/search/astro-ph?searchtype=author&query=Gurgew%2C+D">Danielle Gurgew</a>, <a href="/search/astro-ph?searchtype=author&query=Harmon%2C+K">Keon Harmon</a>, <a href="/search/astro-ph?searchtype=author&query=Hayashi%2C+T">Takayuki Hayashi</a>, <a href="/search/astro-ph?searchtype=author&query=Heatwole%2C+S">Scott Heatwole</a>, <a href="/search/astro-ph?searchtype=author&query=Hossen%2C+M+A">Md Arman Hossen</a>, <a href="/search/astro-ph?searchtype=author&query=Krawczynski%2C+H">Henric Krawczynski</a>, <a href="/search/astro-ph?searchtype=author&query=Lanzi%2C+R+J">R. James Lanzi</a>, <a href="/search/astro-ph?searchtype=author&query=Legere%2C+J">Jason Legere</a>, <a href="/search/astro-ph?searchtype=author&query=Mates%2C+J+A+B">John A. B. Mates</a>, <a href="/search/astro-ph?searchtype=author&query=McConnell%2C+M">Mark McConnell</a>, <a href="/search/astro-ph?searchtype=author&query=Nagy%2C+J">Johanna Nagy</a>, <a href="/search/astro-ph?searchtype=author&query=Okajima%2C+T">Takashi Okajima</a>, <a href="/search/astro-ph?searchtype=author&query=Sato%2C+T">Toshiki Sato</a>, <a href="/search/astro-ph?searchtype=author&query=Schmidt%2C+D">Daniel Schmidt</a>, <a href="/search/astro-ph?searchtype=author&query=Spooner%2C+S">Sean Spooner</a>, <a href="/search/astro-ph?searchtype=author&query=Swetz%2C+D">Daniel Swetz</a>, <a href="/search/astro-ph?searchtype=author&query=Tamura%2C+K">Keisuke Tamura</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="2301.01525v1-abstract-short" style="display: inline;"> Core collapse supernovae are thought to be one of the main sources in the galaxy of elements heavier than iron. Understanding the origin of the elements is thus tightly linked to our understanding of the explosion mechanism of supernovae and supernova nucleosynthesis. X-ray and gamma-ray observations of young supernova remnants, combined with improved theoretical modeling, have resulted in enormou… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2301.01525v1-abstract-full').style.display = 'inline'; document.getElementById('2301.01525v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2301.01525v1-abstract-full" style="display: none;"> Core collapse supernovae are thought to be one of the main sources in the galaxy of elements heavier than iron. Understanding the origin of the elements is thus tightly linked to our understanding of the explosion mechanism of supernovae and supernova nucleosynthesis. X-ray and gamma-ray observations of young supernova remnants, combined with improved theoretical modeling, have resulted in enormous improvements in our knowledge of these events. The isotope ${}^{44}$Ti is one of the most sensitive probes of the innermost regions of the core collapse engine, and its spatial and velocity distribution are key observables. Hard X-ray imaging spectroscopy with the Nuclear Spectroscopic Telescope Array (NuSTAR) has provided new insights into the structure of the supernova remnant Cassiopeia A (Cas A), establishing the convective nature of the supernova engine. However, many questions about the details of this engine remain. We present here the concept for a balloon-borne follow-up mission called ASCENT (A SuperConducting ENergetic x-ray Telescope). ASCENT uses transition edge sensor gamma-ray microcalorimeter detectors with a demonstrated 55 eV Full Width Half Maximum (FWHM) energy resolution at 97 keV. This 8--16-fold improvement in energy resolution over NuSTAR will allow high resolution imaging and spectroscopy of the ${}^{44}$Ti emission. This will allow a detailed reconstruction of gamma-ray line redshifts, widths, and shapes, allowing us to address questions such as: What is the source of the neutron star "kicks"? What is the dominant production pathway for ${}^{44}$Ti? Is the engine of Cas A unique? <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2301.01525v1-abstract-full').style.display = 'none'; document.getElementById('2301.01525v1-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">originally announced</span> January 2023. </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">23 pages, 11 figures</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2204.09761">arXiv:2204.09761</a> <span> [<a href="https://arxiv.org/pdf/2204.09761">pdf</a>, <a href="https://arxiv.org/format/2204.09761">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/10.1016/j.astropartphys.2022.102749">10.1016/j.astropartphys.2022.102749 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Performance of the X-Calibur Hard X-Ray Polarimetry Mission during its 2018/19 Long-Duration Balloon Flight </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/astro-ph?searchtype=author&query=Abarr%2C+Q">Quincy Abarr</a>, <a href="/search/astro-ph?searchtype=author&query=Beheshtipour%2C+B">Banafsheh Beheshtipour</a>, <a href="/search/astro-ph?searchtype=author&query=Beilicke%2C+M">Matthias Beilicke</a>, <a href="/search/astro-ph?searchtype=author&query=Bose%2C+R">Richard Bose</a>, <a href="/search/astro-ph?searchtype=author&query=Braun%2C+D">Dana Braun</a>, <a href="/search/astro-ph?searchtype=author&query=de+Geronimo%2C+G">Gianluigi de Geronimo</a>, <a href="/search/astro-ph?searchtype=author&query=Dowkontt%2C+P">Paul Dowkontt</a>, <a href="/search/astro-ph?searchtype=author&query=Errando%2C+M">Manel Errando</a>, <a href="/search/astro-ph?searchtype=author&query=Gadson%2C+T">Thomas Gadson</a>, <a href="/search/astro-ph?searchtype=author&query=Guarino%2C+V">Victor Guarino</a>, <a href="/search/astro-ph?searchtype=author&query=Heatwole%2C+S">Scott Heatwole</a>, <a href="/search/astro-ph?searchtype=author&query=Hossen%2C+M+A">Md. Arman Hossen</a>, <a href="/search/astro-ph?searchtype=author&query=Iyer%2C+N+K">Nirmal K. Iyer</a>, <a href="/search/astro-ph?searchtype=author&query=Kislat%2C+F">Fabian Kislat</a>, <a href="/search/astro-ph?searchtype=author&query=Kiss%2C+M">M贸zsi Kiss</a>, <a href="/search/astro-ph?searchtype=author&query=Kitaguchi%2C+T">Takao Kitaguchi</a>, <a href="/search/astro-ph?searchtype=author&query=Krawczynski%2C+H">Henric Krawczynski</a>, <a href="/search/astro-ph?searchtype=author&query=Lanzi%2C+R+J">R. James Lanzi</a>, <a href="/search/astro-ph?searchtype=author&query=Li%2C+S">Shaorui Li</a>, <a href="/search/astro-ph?searchtype=author&query=Lisalda%2C+L">Lindsey Lisalda</a>, <a href="/search/astro-ph?searchtype=author&query=Okajima%2C+T">Takashi Okajima</a>, <a href="/search/astro-ph?searchtype=author&query=Pearce%2C+M">Mark Pearce</a>, <a href="/search/astro-ph?searchtype=author&query=Peterson%2C+Z">Zachary Peterson</a>, <a href="/search/astro-ph?searchtype=author&query=Press%2C+L">Logan Press</a>, <a href="/search/astro-ph?searchtype=author&query=Rauch%2C+B">Brian Rauch</a> , et al. (6 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="2204.09761v1-abstract-short" style="display: inline;"> X-Calibur is a balloon-borne telescope that measures the polarization of high-energy X-rays in the 15--50keV energy range. The instrument makes use of the fact that X-rays scatter preferentially perpendicular to the polarization direction. A beryllium scattering element surrounded by pixellated CZT detectors is located at the focal point of the InFOC渭S hard X-ray mirror. The instrument was launche… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2204.09761v1-abstract-full').style.display = 'inline'; document.getElementById('2204.09761v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2204.09761v1-abstract-full" style="display: none;"> X-Calibur is a balloon-borne telescope that measures the polarization of high-energy X-rays in the 15--50keV energy range. The instrument makes use of the fact that X-rays scatter preferentially perpendicular to the polarization direction. A beryllium scattering element surrounded by pixellated CZT detectors is located at the focal point of the InFOC渭S hard X-ray mirror. The instrument was launched for a long-duration balloon (LDB) flight from McMurdo (Antarctica) on December 29, 2018, and obtained the first constraints of the hard X-ray polarization of an accretion-powered pulsar. Here, we describe the characterization and calibration of the instrument on the ground and its performance during the flight, as well as simulations of particle backgrounds and a comparison to measured rates. The pointing system and polarimeter achieved the excellent projected performance. The energy detection threshold for the anticoincidence system was found to be higher than expected and it exhibited unanticipated dead time. Both issues will be remedied for future flights. Overall, the mission performance was nominal, and results will inform the design of the follow-up mission XL-Calibur, which is scheduled to be launched in summer 2022. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2204.09761v1-abstract-full').style.display = 'none'; document.getElementById('2204.09761v1-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> 20 April, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> April 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">19 pages, 31 figures, submitted to Astropart. Phys</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1701.04536">arXiv:1701.04536</a> <span> [<a href="https://arxiv.org/pdf/1701.04536">pdf</a>, <a href="https://arxiv.org/format/1701.04536">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> </div> </div> <p class="title is-5 mathjax"> Design of the telescope truss and gondola for the balloon-borne X-ray polarimeter X-Calibur </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/astro-ph?searchtype=author&query=Kislat%2C+F">Fabian Kislat</a>, <a href="/search/astro-ph?searchtype=author&query=Beheshtipour%2C+B">Banafsheh Beheshtipour</a>, <a href="/search/astro-ph?searchtype=author&query=Dowkontt%2C+P">Paul Dowkontt</a>, <a href="/search/astro-ph?searchtype=author&query=Guarino%2C+V">Victor Guarino</a>, <a href="/search/astro-ph?searchtype=author&query=Lanzi%2C+R+J">R. James Lanzi</a>, <a href="/search/astro-ph?searchtype=author&query=Okajima%2C+T">Takashi Okajima</a>, <a href="/search/astro-ph?searchtype=author&query=Braun%2C+D">Dana Braun</a>, <a href="/search/astro-ph?searchtype=author&query=Cannon%2C+S">Scott Cannon</a>, <a href="/search/astro-ph?searchtype=author&query=De+Geronimo%2C+G">Gialuigi De Geronimo</a>, <a href="/search/astro-ph?searchtype=author&query=Heatwole%2C+S">Scott Heatwole</a>, <a href="/search/astro-ph?searchtype=author&query=Hoorman%2C+J">Janie Hoorman</a>, <a href="/search/astro-ph?searchtype=author&query=Li%2C+S">Shaorui Li</a>, <a href="/search/astro-ph?searchtype=author&query=Mori%2C+H">Hideyuki Mori</a>, <a href="/search/astro-ph?searchtype=author&query=Shreves%2C+C+M">Christopher M. Shreves</a>, <a href="/search/astro-ph?searchtype=author&query=Stuchlik%2C+D">David Stuchlik</a>, <a href="/search/astro-ph?searchtype=author&query=Krawczynski%2C+H">Henric Krawczynski</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="1701.04536v1-abstract-short" style="display: inline;"> X-ray polarimetry has seen a growing interest in recent years. Improvements in detector technology and focusing X-ray optics now enable sensitive astrophysical X-ray polarization measurements. These measurements will provide new insights into the processes at work in accreting black holes, the emission of X-rays from neutron stars and magnetars, and the structure of AGN jets. X-Calibur is a balloo… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1701.04536v1-abstract-full').style.display = 'inline'; document.getElementById('1701.04536v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1701.04536v1-abstract-full" style="display: none;"> X-ray polarimetry has seen a growing interest in recent years. Improvements in detector technology and focusing X-ray optics now enable sensitive astrophysical X-ray polarization measurements. These measurements will provide new insights into the processes at work in accreting black holes, the emission of X-rays from neutron stars and magnetars, and the structure of AGN jets. X-Calibur is a balloon-borne hard X-ray scattering polarimeter. An X-ray mirror with a focal length of 8 m focuses X-rays onto the detector, which consists of a plastic scattering element surrounded by Cadmium-Zinc-Telluride detectors, which absorb and record the scattered X-rays. Since X-rays preferentially scatter perpendicular to their polarization direction, the polarization properties of an X-ray beam can be inferred from the azimuthal distribution of scattered X-rays. A close alignment of the X-ray focal spot with the center of the detector is required in order to reduce systematic uncertainties and to maintain a high photon detection efficiency. This places stringent requirements on the mechanical and thermal stability of the telescope structure. During the flight on a stratospheric balloon, X-Calibur makes use of the Wallops Arc-Second Pointer (WASP) to point the telescope at astrophysical sources. In this paper, we describe the design, construction, and test of the telescope structure, as well as its performance during a 25-hour flight from Ft. Sumner, New Mexico. The carbon fiber-aluminum composite structure met the requirements set by X-Calibur and its design can easily be adapted for other types of experiments, such as X-ray imaging or spectroscopic telescopes. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1701.04536v1-abstract-full').style.display = 'none'; document.getElementById('1701.04536v1-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, 2017; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> January 2017. </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, 20 figures, submitted to Journal of Astronomical Instrumentation</span> </p> </li> </ol> <div class="is-hidden-tablet">  <span class="help" style="display: inline-block;"><a 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