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<span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Plasma Physics">physics.plasm-ph</span> </div> </div> <p class="title is-5 mathjax"> Improved analysis of converging shock radiographs </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Swift%2C+D+C">Damian C. Swift</a>, <a href="/search/physics?searchtype=author&query=Kritcher%2C+A+L">Andrea L. Kritcher</a>, <a href="/search/physics?searchtype=author&query=Lazicki%2C+A">Amy Lazicki</a>, <a href="/search/physics?searchtype=author&query=Kostinski%2C+N">Natalie Kostinski</a>, <a href="/search/physics?searchtype=author&query=Maddox%2C+B+R">Brian R. Maddox</a>, <a href="/search/physics?searchtype=author&query=Martin%2C+M+E">Madison E. Martin</a>, <a href="/search/physics?searchtype=author&query=Doeppner%2C+T">Tilo Doeppner</a>, <a href="/search/physics?searchtype=author&query=Nilsen%2C+J">Joseph Nilsen</a>, <a href="/search/physics?searchtype=author&query=Whitley%2C+H+D">Heather D. Whitley</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="2203.08891v1-abstract-short" style="display: inline;"> We previously reported an experimental platform to induce a spherically-convergent shock in a sample using laser-driven ablation, probed with time-resolved x-ray radiography, and an analysis method to deduce states along the principal shock Hugoniot simultaneously with the x-ray opacity. We have now developed a modified method of analysis that is numerically better-conditioned and faster, and usua… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2203.08891v1-abstract-full').style.display = 'inline'; document.getElementById('2203.08891v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2203.08891v1-abstract-full" style="display: none;"> We previously reported an experimental platform to induce a spherically-convergent shock in a sample using laser-driven ablation, probed with time-resolved x-ray radiography, and an analysis method to deduce states along the principal shock Hugoniot simultaneously with the x-ray opacity. We have now developed a modified method of analysis that is numerically better-conditioned and faster, and usually provides a better representation of the radiograph with correspondingly lower uncertainties. The previous approach was based on optimizing parameters in a model of the density distribution as a function of radius and time, warped to follow loci such as the shock and the outside of the sample. The converging shock configuration can be described more efficiently in terms of the shocked density and sound speed, expressed as functions of the shock speed Studies of the Hugoniot from various theoretical equations of state (EOS) indicate that, in the typical range of states explored by these experiments, these functions can be described by low-order polynomials. Similarly, few-parameter functions were found suitable for representing the variation of x-ray opacity with shock pressure. This approach was found to perform better in most cases than an alternative method based on parameterization of the EOS. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2203.08891v1-abstract-full').style.display = 'none'; document.getElementById('2203.08891v1-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> 16 March, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> March 2022. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> LLNL-JRNL-832834 </p> </li> <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/2006.15635">arXiv:2006.15635</a> <span> [<a href="https://arxiv.org/pdf/2006.15635">pdf</a>, <a href="https://arxiv.org/format/2006.15635">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Computational Physics">physics.comp-ph</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/10.1016/j.hedp.2021.100928">10.1016/j.hedp.2021.100928 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Comparison of ablators for the polar direct drive exploding pusher platform </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Whitley%2C+H+D">Heather D. Whitley</a>, <a href="/search/physics?searchtype=author&query=Kemp%2C+G+E">G. Elijah Kemp</a>, <a href="/search/physics?searchtype=author&query=Yeamans%2C+C">Charles Yeamans</a>, <a href="/search/physics?searchtype=author&query=Walters%2C+Z">Zachary Walters</a>, <a href="/search/physics?searchtype=author&query=Blue%2C+B+E">Brent E. Blue</a>, <a href="/search/physics?searchtype=author&query=Garbett%2C+W">Warren Garbett</a>, <a href="/search/physics?searchtype=author&query=Schneider%2C+M">Marilyn Schneider</a>, <a href="/search/physics?searchtype=author&query=Craxton%2C+R+S">R. Stephen Craxton</a>, <a href="/search/physics?searchtype=author&query=Garcia%2C+E+M">Emma M. Garcia</a>, <a href="/search/physics?searchtype=author&query=McKenty%2C+P+W">Patrick W. McKenty</a>, <a href="/search/physics?searchtype=author&query=Gatu-Johnson%2C+M">Maria Gatu-Johnson</a>, <a href="/search/physics?searchtype=author&query=Caspersen%2C+K">Kyle Caspersen</a>, <a href="/search/physics?searchtype=author&query=Castor%2C+J+I">John I. Castor</a>, <a href="/search/physics?searchtype=author&query=D%C3%A4ne%2C+M">Markus D盲ne</a>, <a href="/search/physics?searchtype=author&query=Ellison%2C+C+L">C. Leland Ellison</a>, <a href="/search/physics?searchtype=author&query=Gaffney%2C+J">James Gaffney</a>, <a href="/search/physics?searchtype=author&query=Graziani%2C+F+R">Frank R. Graziani</a>, <a href="/search/physics?searchtype=author&query=Klepeis%2C+J">John Klepeis</a>, <a href="/search/physics?searchtype=author&query=Kostinski%2C+N">Natalie Kostinski</a>, <a href="/search/physics?searchtype=author&query=Kritcher%2C+A">Andrea Kritcher</a>, <a href="/search/physics?searchtype=author&query=Lahmann%2C+B">Brandon Lahmann</a>, <a href="/search/physics?searchtype=author&query=Lazicki%2C+A+E">Amy E. Lazicki</a>, <a href="/search/physics?searchtype=author&query=Le%2C+H+P">Hai P. Le</a>, <a href="/search/physics?searchtype=author&query=London%2C+R+A">Richard A. London</a>, <a href="/search/physics?searchtype=author&query=Maddox%2C+B">Brian Maddox</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="2006.15635v2-abstract-short" style="display: inline;"> We examine the performance of pure boron, boron carbide, high density carbon, and boron nitride ablators in the polar direct drive exploding pusher (PDXP) platform. The platform uses the polar direct drive configuration at the National Ignition Facility to drive high ion temperatures in a room temperature capsule and has potential applications for plasma physics studies and as a neutron source. Th… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2006.15635v2-abstract-full').style.display = 'inline'; document.getElementById('2006.15635v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2006.15635v2-abstract-full" style="display: none;"> We examine the performance of pure boron, boron carbide, high density carbon, and boron nitride ablators in the polar direct drive exploding pusher (PDXP) platform. The platform uses the polar direct drive configuration at the National Ignition Facility to drive high ion temperatures in a room temperature capsule and has potential applications for plasma physics studies and as a neutron source. The higher tensile strength of these materials compared to plastic enables a thinner ablator to support higher gas pressures, which could help optimize its performance for plasma physics experiments, while ablators containing boron enable the possiblity of collecting addtional data to constrain models of the platform. Applying recently developed and experimentally validated equation of state models for the boron materials, we examine the performance of these materials as ablators in 2D simulations, with particular focus on changes to the ablator and gas areal density, as well as the predicted symmetry of the inherently 2D implosion. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2006.15635v2-abstract-full').style.display = 'none'; document.getElementById('2006.15635v2-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 December, 2020; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 28 June, 2020; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> June 2020. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> LLNL-JRNL-803851 </p> </li> </ol> <div class="is-hidden-tablet"> <!-- feedback for mobile only --> <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"> <!-- MetaColumn 1 --> <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 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