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<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/2410.09837">arXiv:2410.09837</a> <span> [<a href="https://arxiv.org/pdf/2410.09837">pdf</a>, <a href="https://arxiv.org/ps/2410.09837">ps</a>, <a href="https://arxiv.org/format/2410.09837">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Medical Physics">physics.med-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Mathematical Software">cs.MS</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Image and Video Processing">eess.IV</span> </div> </div> <p class="title is-5 mathjax"> Tomographic Model Based Iterative Reconstruction of Symmetric Objects </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Champley%2C+K+M">Kyle M. Champley</a>, <a href="/search/physics?searchtype=author&query=Oksuz%2C+I">Ibrahim Oksuz</a>, <a href="/search/physics?searchtype=author&query=Bisbee%2C+M+G">Matthew G. Bisbee</a>, <a href="/search/physics?searchtype=author&query=Tringe%2C+J+W">Joseph W. Tringe</a>, <a href="/search/physics?searchtype=author&query=Maddox%2C+B">Brian Maddox</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="2410.09837v1-abstract-short" style="display: inline;"> Computed Tomography (CT) reconstruction of objects with cylindrical symmetry can be performed with a single projection. When the measured rays are parallel, and the axis of symmetry is perpendicular to the optical axis, the data can be modeled with the so-called Abel Transform. The Abel Transform has been extensively studied and many methods exist for accurate reconstruction. However, most CT geom… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2410.09837v1-abstract-full').style.display = 'inline'; document.getElementById('2410.09837v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2410.09837v1-abstract-full" style="display: none;"> Computed Tomography (CT) reconstruction of objects with cylindrical symmetry can be performed with a single projection. When the measured rays are parallel, and the axis of symmetry is perpendicular to the optical axis, the data can be modeled with the so-called Abel Transform. The Abel Transform has been extensively studied and many methods exist for accurate reconstruction. However, most CT geometries are cone-beam rather than parallel-beam. Using Abel methods for reconstruction in these cases can lead to distortions and reconstruction artifacts. Here, we develop analytic and model-based iterative reconstruction (MBIR) methods to reconstruct symmetric objects with an arbitrary axis of symmetry from a cone-beam geometry. The MBIR methods demonstrate superior results relative to the analytic inversion methods by mitigating artifacts and reducing noise while retaining fine image features. We demonstrate the efficacy of our methods using simulated and experimentally-acquired x-ray and neutron projections. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2410.09837v1-abstract-full').style.display = 'none'; document.getElementById('2410.09837v1-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 October, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 2024. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2407.09119">arXiv:2407.09119</a> <span> [<a href="https://arxiv.org/pdf/2407.09119">pdf</a>, <a href="https://arxiv.org/format/2407.09119">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Quantum Physics">quant-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Quantum Gases">cond-mat.quant-gas</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"> Enhanced quantum state transfer via feedforward cancellation of optical phase noise </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Maddox%2C+B+P">Benjamin P. Maddox</a>, <a href="/search/physics?searchtype=author&query=Mortlock%2C+J+M">Jonathan M. Mortlock</a>, <a href="/search/physics?searchtype=author&query=Hepworth%2C+T+R">Tom R. Hepworth</a>, <a href="/search/physics?searchtype=author&query=Raghuram%2C+A+P">Adarsh P. Raghuram</a>, <a href="/search/physics?searchtype=author&query=Gregory%2C+P+D">Philip D. Gregory</a>, <a href="/search/physics?searchtype=author&query=Guttridge%2C+A">Alexander Guttridge</a>, <a href="/search/physics?searchtype=author&query=Cornish%2C+S+L">Simon L. Cornish</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="2407.09119v1-abstract-short" style="display: inline;"> Many experimental platforms for quantum science depend on state control via laser fields. Frequently, however, the control fidelity is limited by optical phase noise. This is exacerbated in stabilized laser systems where high-frequency phase noise is an unavoidable consequence of feedback. Here we implement an optical feedforward technique to suppress laser phase noise in the STIRAP state transfer… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2407.09119v1-abstract-full').style.display = 'inline'; document.getElementById('2407.09119v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2407.09119v1-abstract-full" style="display: none;"> Many experimental platforms for quantum science depend on state control via laser fields. Frequently, however, the control fidelity is limited by optical phase noise. This is exacerbated in stabilized laser systems where high-frequency phase noise is an unavoidable consequence of feedback. Here we implement an optical feedforward technique to suppress laser phase noise in the STIRAP state transfer of ultracold RbCs molecules, across 114 THz, from a weakly bound Feshbach state to the rovibrational ground state. By performing over 100 state transfers on single molecules, we measure a significantly enhanced transfer efficiency of 98.7(1)% limited only by available laser intensity. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2407.09119v1-abstract-full').style.display = 'none'; document.getElementById('2407.09119v1-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 July, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 2024. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2210.16883">arXiv:2210.16883</a> <span> [<a href="https://arxiv.org/pdf/2210.16883">pdf</a>, <a href="https://arxiv.org/ps/2210.16883">ps</a>, <a href="https://arxiv.org/format/2210.16883">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Quantum Physics">quant-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Atomic Physics">physics.atom-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> </div> </div> <p class="title is-5 mathjax"> Rapid Electromagnetic Induction Imaging with an Optically Raster-Scanned Atomic Magnetometer </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Maddox%2C+B">B. Maddox</a>, <a href="/search/physics?searchtype=author&query=Deans%2C+C">C. Deans</a>, <a href="/search/physics?searchtype=author&query=Yao%2C+H">H. Yao</a>, <a href="/search/physics?searchtype=author&query=Cohen%2C+Y">Y. Cohen</a>, <a href="/search/physics?searchtype=author&query=Renzoni%2C+F">F. Renzoni</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="2210.16883v1-abstract-short" style="display: inline;"> We present an apparatus to overcome the limitations of mechanical raster-scanning in electromagnetic induction imaging (EMI) techniques by instead performing a 2D optical raster-scan within the vapour cell of a radio-frequency atomic magnetometer (RF-AM). A large cuboidal 87Rb vapour cell is employed to act as the medium of an RF-AM with the pump and probe beams translated in the cell via acousto-… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2210.16883v1-abstract-full').style.display = 'inline'; document.getElementById('2210.16883v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2210.16883v1-abstract-full" style="display: none;"> We present an apparatus to overcome the limitations of mechanical raster-scanning in electromagnetic induction imaging (EMI) techniques by instead performing a 2D optical raster-scan within the vapour cell of a radio-frequency atomic magnetometer (RF-AM). A large cuboidal 87Rb vapour cell is employed to act as the medium of an RF-AM with the pump and probe beams translated in the cell via acousto-optics. The technique is shown to give robust and repeatable magnetic measurements over the cell volume and successfully resolves conductive targets with EMI. Optical raster-scanning removes the limitation of slow mechanical actuation and a fast imaging procedure is enacted resolving conductive targets at a rate of 40 ms/pixel. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2210.16883v1-abstract-full').style.display = 'none'; document.getElementById('2210.16883v1-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 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">Comments:</span> <span class="has-text-grey-dark mathjax">5 pages, 5 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/2203.16065">arXiv:2203.16065</a> <span> [<a href="https://arxiv.org/pdf/2203.16065">pdf</a>, <a href="https://arxiv.org/ps/2203.16065">ps</a>, <a href="https://arxiv.org/format/2203.16065">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> <p class="title is-5 mathjax"> Shock Hugoniot of diamond from 3 to 80 TPa </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=Hawreliak%2C+J+A">James A. Hawreliak</a>, <a href="/search/physics?searchtype=author&query=Doeppner%2C+T">Tilo Doeppner</a>, <a href="/search/physics?searchtype=author&query=Whitley%2C+H+D">Heather D. Whitley</a>, <a href="/search/physics?searchtype=author&query=Nilsen%2C+J">Joseph Nilsen</a>, <a href="/search/physics?searchtype=author&query=Bachmann%2C+B">Benjamin Bachmann</a>, <a href="/search/physics?searchtype=author&query=MacDonald%2C+M">Michael MacDonald</a>, <a href="/search/physics?searchtype=author&query=Maddox%2C+B">Brian Maddox</a>, <a href="/search/physics?searchtype=author&query=Kostinski%2C+N">Natalie Kostinski</a>, <a href="/search/physics?searchtype=author&query=Collins%2C+G+W">Gilbert W. Collins</a>, <a href="/search/physics?searchtype=author&query=Glenzer%2C+S">Siegfried Glenzer</a>, <a href="/search/physics?searchtype=author&query=Rothman%2C+S+D">Stephen D. Rothman</a>, <a href="/search/physics?searchtype=author&query=Kraus%2C+D">Dominik Kraus</a>, <a href="/search/physics?searchtype=author&query=Falcone%2C+R+W">Roger W. Falcone</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="2203.16065v1-abstract-short" style="display: inline;"> The principal Hugoniot of carbon, initially diamond, was measured from 3 to 80 TPa (30 to 800 million atmospheres), the highest pressure ever achieved, using radiography of spherically-converging shocks. The shocks were generated by ablation of a plastic coating by soft x-rays in a laser-heated hohlraum at the National Ignition Facility (NIF). Experiments were performed with low and high drive pow… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2203.16065v1-abstract-full').style.display = 'inline'; document.getElementById('2203.16065v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2203.16065v1-abstract-full" style="display: none;"> The principal Hugoniot of carbon, initially diamond, was measured from 3 to 80 TPa (30 to 800 million atmospheres), the highest pressure ever achieved, using radiography of spherically-converging shocks. The shocks were generated by ablation of a plastic coating by soft x-rays in a laser-heated hohlraum at the National Ignition Facility (NIF). Experiments were performed with low and high drive powers, spanning different but overlapping pressure ranges. The radius-time history of the shock, and the profile of mass density behind, were determined by profile-matching from a time-resolved x-ray radiograph across the diameter of the sphere. Above ~50 TPa, the heating induced by the shock was great enough to ionize a significant fraction of K-shell electrons, reducing the opacity to the 10.2 keV probe x-rays. The opacity and mass density were deduced simultaneously using the constraint that the total mass of the sample was constant. The Hugoniot and opacity were consistent with density functional theory calculations of the electronic states and equation of state (EOS), and varied significantly from theoretical Hugoniots based on Thomas-Fermi theory. Theoretical models used to predict the compressibility of diamond ablator experiments at the NIF, producing the highest neutron yields so far from inertial confinement fusion experiments, are qualitatively consistent with our EOS measurements but appear to overpredict the compressibility slightly. These measurements help to evaluate theoretical techniques and constrain wide-range EOS models applicable to white dwarf stars, which are the ultimate evolutionary form of at least 97% of stars in the galaxy. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2203.16065v1-abstract-full').style.display = 'none'; document.getElementById('2203.16065v1-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 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">Comments:</span> <span class="has-text-grey-dark mathjax">arXiv admin note: text overlap with arXiv:2203.08891</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> LLNL-JRNL-815773 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2203.08891">arXiv:2203.08891</a> <span> [<a href="https://arxiv.org/pdf/2203.08891">pdf</a>, <a href="https://arxiv.org/ps/2203.08891">ps</a>, <a href="https://arxiv.org/format/2203.08891">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> <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/2106.04556">arXiv:2106.04556</a> <span> [<a href="https://arxiv.org/pdf/2106.04556">pdf</a>, <a href="https://arxiv.org/ps/2106.04556">ps</a>, <a href="https://arxiv.org/format/2106.04556">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Atomic Physics">physics.atom-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Quantum Physics">quant-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/10.1063/5.0056876">10.1063/5.0056876 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Electromagnetic induction imaging with a scanning radio-frequency atomic magnetometer </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Deans%2C+C">Cameron Deans</a>, <a href="/search/physics?searchtype=author&query=Cohen%2C+Y">Yuval Cohen</a>, <a href="/search/physics?searchtype=author&query=Yao%2C+H">Han Yao</a>, <a href="/search/physics?searchtype=author&query=Maddox%2C+B">Benjamin Maddox</a>, <a href="/search/physics?searchtype=author&query=Vigilante%2C+A">Antonio Vigilante</a>, <a href="/search/physics?searchtype=author&query=Renzoni%2C+F">Ferruccio Renzoni</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="2106.04556v1-abstract-short" style="display: inline;"> We demonstrate electromagnetic induction imaging with an unshielded, portable radio-frequency atomic magnetometer scanning over the target object. This configuration satisfies standard requirements in typical applications, from security screening to medical imaging. The ability to scan the magnetometer over the object relies on the miniaturization of the sensor head and on the active compensation… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2106.04556v1-abstract-full').style.display = 'inline'; document.getElementById('2106.04556v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2106.04556v1-abstract-full" style="display: none;"> We demonstrate electromagnetic induction imaging with an unshielded, portable radio-frequency atomic magnetometer scanning over the target object. This configuration satisfies standard requirements in typical applications, from security screening to medical imaging. The ability to scan the magnetometer over the object relies on the miniaturization of the sensor head and on the active compensation of the ambient magnetic field. Additionally, a procedure is implemented to extract high-quality images from the recorded spatial dependent magnetic resonance. The procedure is shown to be effective in suppressing the detrimental effects of the spatial variation of the magnetic environment. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2106.04556v1-abstract-full').style.display = 'none'; document.getElementById('2106.04556v1-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> 8 June, 2021; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> June 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">Letter</span> </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> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1301.2842">arXiv:1301.2842</a> <span> [<a href="https://arxiv.org/pdf/1301.2842">pdf</a>, <a href="https://arxiv.org/ps/1301.2842">ps</a>, <a href="https://arxiv.org/format/1301.2842">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> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Computational Physics">physics.comp-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/PhysRevB.84.161402">10.1103/PhysRevB.84.161402 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> The interactions of same-row oxygen vacancies on rutile TiO$_2$(110) </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Kappes%2C+B+B">B. B. Kappes</a>, <a href="/search/physics?searchtype=author&query=Maddox%2C+W+B">W. B. Maddox</a>, <a href="/search/physics?searchtype=author&query=Acharya%2C+D+P">D. P. Acharya</a>, <a href="/search/physics?searchtype=author&query=Sutter%2C+P">P. Sutter</a>, <a href="/search/physics?searchtype=author&query=Ciobanu%2C+C+V">C. V. Ciobanu</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="1301.2842v1-abstract-short" style="display: inline;"> Based on a dipolar-elastic model for oxygen vacancies on rutile (110), we evaluated analytically the overall energy of a periodic array of two vacancies and extracted the interaction parameters from total-energy density functional theory (DFT) calculations. Our calculations show that the dipole model holds for next-nearest neighbor vacancies and beyond. The elastic-dipolar interaction vanishes for… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1301.2842v1-abstract-full').style.display = 'inline'; document.getElementById('1301.2842v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1301.2842v1-abstract-full" style="display: none;"> Based on a dipolar-elastic model for oxygen vacancies on rutile (110), we evaluated analytically the overall energy of a periodic array of two vacancies and extracted the interaction parameters from total-energy density functional theory (DFT) calculations. Our calculations show that the dipole model holds for next-nearest neighbor vacancies and beyond. The elastic-dipolar interaction vanishes for adjacent vacancies, but they still experience an electrostatic repulsion. The proposed interaction model predicts a vacancy separation distribution that agrees well with that determined in our ultra-high vacuum scanning tunneling microscopy experiments, and provides a perspective for understanding earlier DFT reports. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1301.2842v1-abstract-full').style.display = 'none'; document.getElementById('1301.2842v1-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 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">5 pages, 4 figures, published as a rapid communication</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Physical Review B 84, 161402 (2011) </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 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