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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/2111.11310">arXiv:2111.11310</a> <span> [<a href="https://arxiv.org/pdf/2111.11310">pdf</a>, <a href="https://arxiv.org/format/2111.11310">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Plasma Physics">physics.plasm-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Phenomenology">hep-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/10.1038/s41586-021-03382-w">10.1038/s41586-021-03382-w <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> The data-driven future of high energy density physics </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Hatfield%2C+P+W">Peter W. Hatfield</a>, <a href="/search/physics?searchtype=author&query=Gaffney%2C+J+A">Jim A. Gaffney</a>, <a href="/search/physics?searchtype=author&query=Anderson%2C+G+J">Gemma J. Anderson</a>, <a href="/search/physics?searchtype=author&query=Ali%2C+S">Suzanne Ali</a>, <a href="/search/physics?searchtype=author&query=Antonelli%2C+L">Luca Antonelli</a>, <a href="/search/physics?searchtype=author&query=Pree%2C+S+B+d">Suzan Ba艧e臒mez du Pree</a>, <a href="/search/physics?searchtype=author&query=Citrin%2C+J">Jonathan Citrin</a>, <a href="/search/physics?searchtype=author&query=Fajardo%2C+M">Marta Fajardo</a>, <a href="/search/physics?searchtype=author&query=Knapp%2C+P">Patrick Knapp</a>, <a href="/search/physics?searchtype=author&query=Kettle%2C+B">Brendan Kettle</a>, <a href="/search/physics?searchtype=author&query=Kustowski%2C+B">Bogdan Kustowski</a>, <a href="/search/physics?searchtype=author&query=MacDonald%2C+M+J">Michael J. MacDonald</a>, <a href="/search/physics?searchtype=author&query=Mariscal%2C+D">Derek Mariscal</a>, <a href="/search/physics?searchtype=author&query=Martin%2C+M+E">Madison E. Martin</a>, <a href="/search/physics?searchtype=author&query=Nagayama%2C+T">Taisuke Nagayama</a>, <a href="/search/physics?searchtype=author&query=Palmer%2C+C+A+J">Charlotte A. J. Palmer</a>, <a href="/search/physics?searchtype=author&query=Peterson%2C+J+L">J. Luc Peterson</a>, <a href="/search/physics?searchtype=author&query=Rose%2C+S">Steven Rose</a>, <a href="/search/physics?searchtype=author&query=Ruby%2C+J+J">J J Ruby</a>, <a href="/search/physics?searchtype=author&query=Shneider%2C+C">Carl Shneider</a>, <a href="/search/physics?searchtype=author&query=Streeter%2C+M+J+V">Matt J. V. Streeter</a>, <a href="/search/physics?searchtype=author&query=Trickey%2C+W">Will Trickey</a>, <a href="/search/physics?searchtype=author&query=Williams%2C+B">Ben Williams</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="2111.11310v1-abstract-short" style="display: inline;"> The study of plasma physics under conditions of extreme temperatures, densities and electromagnetic field strengths is significant for our understanding of astrophysics, nuclear fusion and fundamental physics. These extreme physical systems are strongly non-linear and very difficult to understand theoretically or optimize experimentally. Here, we argue that machine learning models and data-driven… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2111.11310v1-abstract-full').style.display = 'inline'; document.getElementById('2111.11310v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2111.11310v1-abstract-full" style="display: none;"> The study of plasma physics under conditions of extreme temperatures, densities and electromagnetic field strengths is significant for our understanding of astrophysics, nuclear fusion and fundamental physics. These extreme physical systems are strongly non-linear and very difficult to understand theoretically or optimize experimentally. Here, we argue that machine learning models and data-driven methods are in the process of reshaping our exploration of these extreme systems that have hitherto proven far too non-linear for human researchers. From a fundamental perspective, our understanding can be helped by the way in which machine learning models can rapidly discover complex interactions in large data sets. From a practical point of view, the newest generation of extreme physics facilities can perform experiments multiple times a second (as opposed to ~daily), moving away from human-based control towards automatic control based on real-time interpretation of diagnostic data and updates of the physics model. To make the most of these emerging opportunities, we advance proposals for the community in terms of research design, training, best practices, and support for synthetic diagnostics and data analysis. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2111.11310v1-abstract-full').style.display = 'none'; document.getElementById('2111.11310v1-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 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">14 pages, 4 figures. This work was the result of a meeting at the Lorentz Center, University of Leiden, 13th-17th January 2020. This is a preprint of Hatfield et al., Nature, 593, 7859, 351-361 (2021) https://www.nature.com/articles/s41586-021-03382-w</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Nature, 593, 7859, 351-361, 2021 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1610.02342">arXiv:1610.02342</a> <span> [<a href="https://arxiv.org/pdf/1610.02342">pdf</a>, <a href="https://arxiv.org/format/1610.02342">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Solar and Stellar Astrophysics">astro-ph.SR</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Atomic Physics">physics.atom-ph</span> </div> </div> <p class="title is-5 mathjax"> Modeling the Spectra of Dense Hydrogen Plasmas: Beyond Occupation Probability </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Gomez%2C+T+A">T. A. Gomez</a>, <a href="/search/physics?searchtype=author&query=Montgomery%2C+M+H">M. H. Montgomery</a>, <a href="/search/physics?searchtype=author&query=Nagayama%2C+T">T. Nagayama</a>, <a href="/search/physics?searchtype=author&query=Kilcrease%2C+D+P">D. P. Kilcrease</a>, <a href="/search/physics?searchtype=author&query=Winget%2C+D+E">D. E. Winget</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="1610.02342v1-abstract-short" style="display: inline;"> Accurately measuring the masses of white dwarf stars is crucial in many astrophysical contexts (e.g., asteroseismology and cosmochronology). These masses are most commonly determined by fitting a model atmosphere to an observed spectrum; this is known as the spectroscopic method. However, for cases in which more than one method may be employed, there are well known discrepancies between masses det… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1610.02342v1-abstract-full').style.display = 'inline'; document.getElementById('1610.02342v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1610.02342v1-abstract-full" style="display: none;"> Accurately measuring the masses of white dwarf stars is crucial in many astrophysical contexts (e.g., asteroseismology and cosmochronology). These masses are most commonly determined by fitting a model atmosphere to an observed spectrum; this is known as the spectroscopic method. However, for cases in which more than one method may be employed, there are well known discrepancies between masses determined by the spectroscopic method and those determined by astrometric, dynamical, and/or gravitational-redshift methods. In an effort to resolve these discrepancies, we are developing a new model of hydrogen in a dense plasma that is a significant departure from previous models. Experiments at Sandia National Laboratories are currently underway to validate these new models, and we have begun modifications to incorporate these models into stellar-atmosphere codes. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1610.02342v1-abstract-full').style.display = 'none'; document.getElementById('1610.02342v1-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> 7 October, 2016; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 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">6 pages, 4 figures, to appear in the Proceedings of The 20th European Workshop on White Dwarfs</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1406.4490">arXiv:1406.4490</a> <span> [<a href="https://arxiv.org/pdf/1406.4490">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Plasma Physics">physics.plasm-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/10.1063/1.4903324">10.1063/1.4903324 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Multiple-view spectrally resolved x-ray imaging observations of polar-direct-drive implosions on OMEGA </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Mancini%2C+R+C">R. C. Mancini</a>, <a href="/search/physics?searchtype=author&query=Johns%2C+H+M">H. M. Johns</a>, <a href="/search/physics?searchtype=author&query=Joshi%2C+T">T. Joshi</a>, <a href="/search/physics?searchtype=author&query=Mayes%2C+D">D. Mayes</a>, <a href="/search/physics?searchtype=author&query=Nagayama%2C+T">T. Nagayama</a>, <a href="/search/physics?searchtype=author&query=Hsu%2C+S+C">S. C. Hsu</a>, <a href="/search/physics?searchtype=author&query=Baumgaertel%2C+J+A">J. A. Baumgaertel</a>, <a href="/search/physics?searchtype=author&query=Cobble%2C+J">J. Cobble</a>, <a href="/search/physics?searchtype=author&query=Krasheninnikova%2C+N+S">N. S. Krasheninnikova</a>, <a href="/search/physics?searchtype=author&query=Bradley%2C+P+A">P. A. Bradley</a>, <a href="/search/physics?searchtype=author&query=Hakel%2C+P">P. Hakel</a>, <a href="/search/physics?searchtype=author&query=Murphy%2C+T+J">T. J. Murphy</a>, <a href="/search/physics?searchtype=author&query=Schmitt%2C+M+J">M. J. Schmitt</a>, <a href="/search/physics?searchtype=author&query=Shah%2C+R+C">R. C. Shah</a>, <a href="/search/physics?searchtype=author&query=Tregillis%2C+I+L">I. L. Tregillis</a>, <a href="/search/physics?searchtype=author&query=Wysocki%2C+F+J">F. J. Wysocki</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="1406.4490v1-abstract-short" style="display: inline;"> We present spatially, temporally, and spectrally resolved narrow- and broad-band x-ray images of polar-direct-drive (PDD) implosions on OMEGA. These self-emission images were obtained during the deceleration phase and bang time using several multiple monochromatic x-ray imaging instruments fielded along two or three quasi-orthogonal lines-of-sight including equatorial and polar views. The instrume… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1406.4490v1-abstract-full').style.display = 'inline'; document.getElementById('1406.4490v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1406.4490v1-abstract-full" style="display: none;"> We present spatially, temporally, and spectrally resolved narrow- and broad-band x-ray images of polar-direct-drive (PDD) implosions on OMEGA. These self-emission images were obtained during the deceleration phase and bang time using several multiple monochromatic x-ray imaging instruments fielded along two or three quasi-orthogonal lines-of-sight including equatorial and polar views. The instruments recorded images based on K-shell lines from a titanium tracer located in the shell as well as continuum emission. These observations constitute the first such data obtained for PDD implosions. The image data show features attributed to zero-order hydrodynamics. Equatorial view synthetic images obtained from post-processing a 2D hydrodynamic simulation are consistent with the experimental observation. Polar view images show a pentagonal pattern that correlates with the PDD laser illumination used on OMEGA, thus revealing a 3D aspect of these experiments not previously observed. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1406.4490v1-abstract-full').style.display = 'none'; document.getElementById('1406.4490v1-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, 2014; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> June 2014. </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">22 pages, 10 figures, submitted for publication</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> LA-UR-14-23564 </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Physics of Plasmas 2, 122704 (2014) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1405.4016">arXiv:1405.4016</a> <span> [<a href="https://arxiv.org/pdf/1405.4016">pdf</a>, <a href="https://arxiv.org/format/1405.4016">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Plasma Physics">physics.plasm-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/10.1063/1.4875741">10.1063/1.4875741 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Direct asymmetry measurement of temperature and density spatial distributions in inertial confinement fusion plasmas from pinhole space-resolved spectra </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Nagayama%2C+T">T. Nagayama</a>, <a href="/search/physics?searchtype=author&query=Mancini%2C+R+C">R. C. Mancini</a>, <a href="/search/physics?searchtype=author&query=Florido%2C+R">R. Florido</a>, <a href="/search/physics?searchtype=author&query=Mayes%2C+D">D. Mayes</a>, <a href="/search/physics?searchtype=author&query=Tommasini%2C+R">R. Tommasini</a>, <a href="/search/physics?searchtype=author&query=Koch%2C+J+A">J. A. Koch</a>, <a href="/search/physics?searchtype=author&query=Delettrez%2C+J+A">J. A. Delettrez</a>, <a href="/search/physics?searchtype=author&query=Regan%2C+S+P">S. P. Regan</a>, <a href="/search/physics?searchtype=author&query=Smalyuk%2C+V+A">V. A. Smalyuk</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="1405.4016v1-abstract-short" style="display: inline;"> Two-dimensional space-resolved temperature and density images of an inertial confinement fusion (ICF) implosion core have been diagnosed for the first time. Argon-doped, direct-drive ICF experiments were performed at the Omega Laser Facility and a collection of two-dimensional space-resolved spectra were obtained from an array of gated, spectrally resolved pinhole images recorded by a multi-monoch… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1405.4016v1-abstract-full').style.display = 'inline'; document.getElementById('1405.4016v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1405.4016v1-abstract-full" style="display: none;"> Two-dimensional space-resolved temperature and density images of an inertial confinement fusion (ICF) implosion core have been diagnosed for the first time. Argon-doped, direct-drive ICF experiments were performed at the Omega Laser Facility and a collection of two-dimensional space-resolved spectra were obtained from an array of gated, spectrally resolved pinhole images recorded by a multi-monochromatic x-ray imager. Detailed spectral analysis revealed asymmetries of the core not just in shape and size but in the temperature and density spatial distributions, thus characterizing the core with an unprecedented level of detail. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1405.4016v1-abstract-full').style.display = 'none'; document.getElementById('1405.4016v1-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 May, 2014; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> May 2014. </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">Published online 7 May 2014</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1405.4012">arXiv:1405.4012</a> <span> [<a href="https://arxiv.org/pdf/1405.4012">pdf</a>, <a href="https://arxiv.org/format/1405.4012">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Solar and Stellar Astrophysics">astro-ph.SR</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Plasma Physics">physics.plasm-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/10.1063/1.4872324">10.1063/1.4872324 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Control and diagnosis of temperature, density, and uniformity in x-ray heated iron/magnesium samples for opacity measurements </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Nagayama%2C+T">T. Nagayama</a>, <a href="/search/physics?searchtype=author&query=Bailey%2C+J+E">J. E. Bailey</a>, <a href="/search/physics?searchtype=author&query=Loisel%2C+G">G. Loisel</a>, <a href="/search/physics?searchtype=author&query=Hansen%2C+S+B">S. B. Hansen</a>, <a href="/search/physics?searchtype=author&query=Rochau%2C+G+A">G. A. Rochau</a>, <a href="/search/physics?searchtype=author&query=Mancini%2C+R+C">R. C. Mancini</a>, <a href="/search/physics?searchtype=author&query=MacFarlane%2C+J+J">J. J. MacFarlane</a>, <a href="/search/physics?searchtype=author&query=Golovkin%2C+I">I. Golovkin</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="1405.4012v1-abstract-short" style="display: inline;"> Experimental tests are in progress to evaluate the accuracy of the modeled iron opacity at solar interior conditions, in particular to better constrain the solar abundance problem [S. Basu and H.M. Antia, Physics Reports 457, 217 (2008)]. Here we describe measurements addressing three of the key requirements for reliable opacity experiments: control of sample conditions, independent sample conditi… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1405.4012v1-abstract-full').style.display = 'inline'; document.getElementById('1405.4012v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1405.4012v1-abstract-full" style="display: none;"> Experimental tests are in progress to evaluate the accuracy of the modeled iron opacity at solar interior conditions, in particular to better constrain the solar abundance problem [S. Basu and H.M. Antia, Physics Reports 457, 217 (2008)]. Here we describe measurements addressing three of the key requirements for reliable opacity experiments: control of sample conditions, independent sample condition diagnostics, and verification of sample condition uniformity. The opacity samples consist of iron/magnesium layers tamped by plastic. By changing the plastic thicknesses, we have controlled the iron plasma conditions to reach i) Te=167+/-3 eV and ne=(7.1+/-1.5)e21 e/cc, ii) Te=170+/-2 eV and ne=(2.0+/-0.2)e22 e/cc, and iii) Te=196+/-6 eV and ne=(3.8+/-0.8)e22 e/cc, which were measured by magnesium tracer K-shell spectroscopy. The opacity sample non-uniformity was directly measured by a separate experiment where Al is mixed into the side of the sample facing the radiation source and Mg into the other side. The iron condition was confirmed to be uniform within their measurement uncertainties by Al and Mg K-shell spectroscopy. The conditions are suitable for testing opacity calculations needed for modeling the solar interior, other stars, and high energy density plasmas. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1405.4012v1-abstract-full').style.display = 'none'; document.getElementById('1405.4012v1-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 May, 2014; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> May 2014. </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">Published online 14 May 2014</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> 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