High Energy Density Physics最新文献_第6页

Three-dimensional reconstruction of implosion stagnation in laser direct drive on OMEGA 欧米茄激光直接驱动中内爆停滞的三维重建

IF 1.6 3区物理与天体物理

High Energy Density Physics Pub Date : 2024-05-23 DOI: 10.1016/j.hedp.2024.101108

K. Churnetski , K.M. Woo , W. Theobald , C. Stoeckl , L. Ceurvorst , V. Gopalaswamy , H.G. Rinderknecht , P.V. Heuer , J.P. Knauer , C.J. Forrest , I.V. Igumenshchev , S.T. Ivancic , M. Michalko , R.C. Shah , A. Lees , P.B. Radha , R. Betti , C.A. Thomas , S.P. Regan , J. Kunimune , J.A. Frenje

{"title":"Three-dimensional reconstruction of implosion stagnation in laser direct drive on OMEGA","authors":"K. Churnetski , K.M. Woo , W. Theobald , C. Stoeckl , L. Ceurvorst , V. Gopalaswamy , H.G. Rinderknecht , P.V. Heuer , J.P. Knauer , C.J. Forrest , I.V. Igumenshchev , S.T. Ivancic , M. Michalko , R.C. Shah , A. Lees , P.B. Radha , R. Betti , C.A. Thomas , S.P. Regan , J. Kunimune , J.A. Frenje","doi":"10.1016/j.hedp.2024.101108","DOIUrl":"10.1016/j.hedp.2024.101108","url":null,"abstract":"<div><p>Multidimensional effects on hot-spot formation must be considered to better understand the current limits on the performance of direct-drive inertial confinement fusion experiments on OMEGA with cryogenically layered solid deuterium–tritium targets. A comprehensive reconstruction effort has been established at the Laboratory for Laser Energetics to infer hot-spot and shell conditions at stagnation from a large collection of x-ray, neutron, and particle detectors along multiple lines of sight. Several time-gated and time-integrated x-ray imagers are being used to record the shape of the hot-spot plasma. A 3D hot-spot x-ray emission tomography technique has been developed to infer low-mode drive asymmetries from the hot-spot shape. A suite of neutron diagnostics is used to provide measurements of hot-spot flow velocity, ion temperature, and areal density. The information obtained from the x-ray and neutron detectors will be combined into a coherent model of the shape of the hot spot and shell assembly.</p></div>","PeriodicalId":49267,"journal":{"name":"High Energy Density Physics","volume":"52 ","pages":"Article 101108"},"PeriodicalIF":1.6,"publicationDate":"2024-05-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141144914","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Resistive diffusion in magnetized ICF implosions: Reduced magnetic stabilization of the Richtmyer–Meshkov instability 磁化 ICF 内爆中的电阻扩散：Richtmyer-Meshkov 不稳定性的减磁稳定性

IF 1.6 3区物理与天体物理

High Energy Density Physics Pub Date : 2024-05-13 DOI: 10.1016/j.hedp.2024.101103

C.A. Walsh , D.J. Strozzi , H. Sio , B.B. Pollock , B.D. Appelbe , A.J. Crilly , S. O’Neill , C. Weber , J.P. Chittenden , J.D. Moody

{"title":"Resistive diffusion in magnetized ICF implosions: Reduced magnetic stabilization of the Richtmyer–Meshkov instability","authors":"C.A. Walsh , D.J. Strozzi , H. Sio , B.B. Pollock , B.D. Appelbe , A.J. Crilly , S. O’Neill , C. Weber , J.P. Chittenden , J.D. Moody","doi":"10.1016/j.hedp.2024.101103","DOIUrl":"https://doi.org/10.1016/j.hedp.2024.101103","url":null,"abstract":"<div><p>Resistive diffusion is typically regarded to be negligible in magnetized ICF experiments, with magnetic flux effectively compressed during the implosion. In this work the Richtmyer–Meshkov instability at the ice-ablator interface is taken as an example for investigating resistive effects. For a high temperature (<span><math><mo>≈</mo></math></span>100eV) interface with magnetic field applied perpendicular to shock propagation, perturbation growth is suppressed by magnetic tension. However, for lower temperature interfaces the resistive diffusion prevents substantial magnetic field twisting at small scales. ICF implosion simulations are then used to assess magnetic diffusivity at different interfaces; the ice-ablator interface is found to be too resistive for the magnetic fields to enhance stability. For Rayleigh–Taylor growth at the hot-spot edge, on the other hand, resistivity is estimated to only be a secondary effect, as seen in previous simulation studies.</p></div>","PeriodicalId":49267,"journal":{"name":"High Energy Density Physics","volume":"51 ","pages":"Article 101103"},"PeriodicalIF":1.6,"publicationDate":"2024-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141068056","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Isofield plasma expansion in kJ petawatt laser-driven ion acceleration with a tailored fast electron temperature 千焦帕特激光驱动离子加速中的等场等离子体膨胀与定制的快速电子温度

IF 1.6 3区物理与天体物理

High Energy Density Physics Pub Date : 2024-05-11 DOI: 10.1016/j.hedp.2024.101107

N. Iwata , K. Mima , Y. Sentoku

{"title":"Isofield plasma expansion in kJ petawatt laser-driven ion acceleration with a tailored fast electron temperature","authors":"N. Iwata , K. Mima , Y. Sentoku","doi":"10.1016/j.hedp.2024.101107","DOIUrl":"10.1016/j.hedp.2024.101107","url":null,"abstract":"<div><p>Kilojoule-class relativistic intensity lasers, having multi-picosecond (ps) pulse durations, enable efficient ion acceleration in the interaction with thin foil targets. The foil plasma expands under the laser energy input over picoseconds where fast electrons keep increasing their effective temperature, while they convert a part of the energy into fast ions through generation of a sheath electric field. The temporal evolution of the sheath electric field is the key to understanding the efficient ion acceleration seen in kJ-class laser experiments. Here, we extend the non-isothermal plasma expansion model by introducing a temporal function of the effective temperature of fast electrons to obtain the sheath electric field in the expanding plasma. We theoretically derived that when the effective temperature of fast electrons increases in proportional to the square of the time, the strength of the sheath electric field is kept constant without depletion during the expansion. This ‘isofield’ expansion is confirmed by a quasi-one-dimensional particle-in-cell simulation. The isofield expansion results in a high energy ion acceleration with a small expansion length, which is favorable for realizing an efficient ion acceleration with less lateral energy loss in multi-dimensional situations.</p></div>","PeriodicalId":49267,"journal":{"name":"High Energy Density Physics","volume":"51 ","pages":"Article 101107"},"PeriodicalIF":1.6,"publicationDate":"2024-05-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141047057","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

On the computation of moments in the Super-Transition-Arrays model for radiative opacity calculations 关于用于辐射不透明性计算的超转换阵模型中的矩计算

IF 1.6 3区物理与天体物理

High Energy Density Physics Pub Date : 2024-05-06 DOI: 10.1016/j.hedp.2024.101104

Jean-Christophe Pain , Brian G. Wilson

{"title":"On the computation of moments in the Super-Transition-Arrays model for radiative opacity calculations","authors":"Jean-Christophe Pain , Brian G. Wilson","doi":"10.1016/j.hedp.2024.101104","DOIUrl":"10.1016/j.hedp.2024.101104","url":null,"abstract":"<div><p>In the Super-Transition-Array statistical method for the computation of radiative opacity of hot dense matter, the moments of the absorption or emission features involve partition functions with reduced degeneracies, occurring through the calculation of averages of products of subshell populations. In the present work, we discuss several aspects of the computation of such peculiar partition functions, insisting on the precautions that must be taken in order to avoid numerical difficulties. In a previous work, we derived a formula for supershell partition functions, which takes the form of a functional of the distribution of energies within the supershell and allows for fast and accurate computations, truncating the number of terms in the expansion. The latter involves coefficients for which we obtained a recursion relation and an explicit formula. We show that such an expansion can be combined with the recurrence relation for shifted partition functions. We also propose, neglecting the effect of fine structure as a first step, a positive-definite formula for the Super-Transition-Array moments of any order, providing an insight into the asymmetry and sharpness of the latter. The corresponding formulas are free of alternating sums. Several ways to speed up the calculations are also presented.</p></div>","PeriodicalId":49267,"journal":{"name":"High Energy Density Physics","volume":"51 ","pages":"Article 101104"},"PeriodicalIF":1.6,"publicationDate":"2024-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140930863","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Configuration entropy and thermodynamics phase transition of black hole in f(R) gravity f(R) 引力下黑洞的构型熵和热力学相变

IF 1.6 3区物理与天体物理

High Energy Density Physics Pub Date : 2024-05-06 DOI: 10.1016/j.hedp.2024.101105

Shad Ali

{"title":"Configuration entropy and thermodynamics phase transition of black hole in f(R) gravity","authors":"Shad Ali","doi":"10.1016/j.hedp.2024.101105","DOIUrl":"https://doi.org/10.1016/j.hedp.2024.101105","url":null,"abstract":"<div><p>Starting from a d<span><math><mo>−</mo></math></span>dimensional black hole (BH) in <span><math><mrow><mi>f</mi><mrow><mo>(</mo><mi>R</mi><mo>)</mo></mrow></mrow></math></span> gravity, we analyzed the effect of modified gravity on critical point parameters, the difference in number densities, and configuration entropy during the BH phase transition phenomenon. From our investigations, consistent results with charged AdS BH are obtained that is holographic dual of van der Waal’s fluid and hence the BH in modified gravity. The thermodynamic pressure, temperature, and free energy are affected by <span><math><mrow><mi>f</mi><mrow><mo>(</mo><mi>R</mi><mo>)</mo></mrow></mrow></math></span> gravity. The difference in the number densities of molecules (small and large BHs) and configuration entropy are investigated as a function of reduced temperature <span><math><mrow><mo>(</mo><mover><mrow><mi>τ</mi></mrow><mrow><mo>̃</mo></mrow></mover><mo>)</mo></mrow></math></span>. The difference in the number densities of BH molecules in <span><math><mrow><mi>f</mi><mrow><mo>(</mo><mi>R</mi><mo>)</mo></mrow></mrow></math></span> gravity decreases with the increase in <span><math><mover><mrow><mi>τ</mi></mrow><mrow><mo>̃</mo></mrow></mover></math></span>, whereas, <span><math><msub><mrow><mi>S</mi></mrow><mrow><mi>c</mi><mi>o</mi><mi>n</mi></mrow></msub></math></span> increases monotonically and becomes a concave function with the increase in space–time dimensions. The relation between the difference in the number density of BH molecules and space–time dimensions <span><math><mrow><mo>(</mo><mi>d</mi><mo>)</mo></mrow></math></span> decreases with the increase in dimension <span><math><mi>d</mi></math></span>. Finally, using our results, the laws of BH Physics are also discussed.</p></div>","PeriodicalId":49267,"journal":{"name":"High Energy Density Physics","volume":"51 ","pages":"Article 101105"},"PeriodicalIF":1.6,"publicationDate":"2024-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140893371","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Eigenmodes and eigenfunctions of high-power electromagnetic waves in inhomogeneous magnetized plasmas and their stability to stimulated Raman backscattering 非均质磁化等离子体中大功率电磁波的特征模和特征函数及其受激拉曼反向散射的稳定性

IF 1.6 3区物理与天体物理

High Energy Density Physics Pub Date : 2024-04-30 DOI: 10.1016/j.hedp.2024.101106

M. Hashemzadeh, A. Heidari

引用次数: 0

Probing dense plasmas for HEDS and ICF* 探测高密度等离子体，用于 HEDS 和 ICF*

IF 1.6 3区物理与天体物理

High Energy Density Physics Pub Date : 2024-04-21 DOI: 10.1016/j.hedp.2024.101102

O L Landen

引用次数: 0

Erratum and addendum to “Simple electron-impact excitation cross-sections including plasma density effects” [High Energy Density Phys. 38 100923 (2021)] 包括等离子体密度效应的简单电子撞击激发截面"[《高能量密度物理学》38 100923 (2021)] 勘误和增编

IF 1.6 3区物理与天体物理

High Energy Density Physics Pub Date : 2024-04-20 DOI: 10.1016/j.hedp.2024.101100

Jean-Christophe Pain , Djamel Benredjem

引用次数: 0

Thick-shell model of indirect-drive yield sensitivity 间接驱动产量灵敏度厚壳模型

IF 1.6 3区物理与天体物理

High Energy Density Physics Pub Date : 2024-04-12 DOI: 10.1016/j.hedp.2024.101101

引用次数: 0

Corrigendum to “Supersonic radiation wave in doped low density foam” [High Energy Density Physics, 50, 101082 (2024)] 掺杂低密度泡沫中的超音速辐射波》[《高能量密度物理学》，50，101082 (2024)] 更正

IF 1.6 3区物理与天体物理

High Energy Density Physics Pub Date : 2024-04-06 DOI: 10.1016/j.hedp.2024.101096

Avner P. Cohen , Elad Malka , Guy Malamud

引用次数: 0