Characterization of hot electrons generated by laser–plasma interaction at shock ignition intensities

IF 4.8 1区物理与天体物理 Q1 PHYSICS, MULTIDISCIPLINARY

Matter and Radiation at Extremes Pub Date : 2023-09-13 DOI:10.1063/5.0157168

E. D. Filippov, M. Khan, A. Tentori, P. Gajdos, A. S. Martynenko, R. Dudzak, P. Koester, G. Zeraouli, D. Mancelli, F. Baffigi, L. A. Gizzi, S. A. Pikuz, Ph.D. Nicolaï, N. C. Woolsey, R. Fedosejevs, M. Krus, L. Juha, D. Batani, O. Renner, G. Cristoforetti

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引用次数: 1

Abstract

In an experiment carried out at the Prague Asterix Laser System at laser intensities relevant to shock ignition conditions (I > 1016 W/cm2), the heating and transport of hot electrons were studied by using several complementary diagnostics, i.e., Kα time-resolved imaging, hard x-ray filtering (a bremsstrahlung cannon), and electron spectroscopy. Ablators with differing composition from low Z (parylene N) to high Z (nickel) were used in multilayer planar targets to produce plasmas with different coronal temperature and collisionality and modify the conditions of hot-electron generation. The variety of available diagnostics allowed full characterization of the population of hot electrons, retrieving their conversion efficiency, time generation and duration, temperature, and angular divergence. The obtained results are shown to be consistent with those from detailed simulations and similar inertial confinement fusion experiments. Based on the measured data, the advantages, reliability, and complementarity of the experimental diagnostics are discussed.

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激波点火强度下激光等离子体相互作用产生的热电子的表征

在布拉格阿斯特里克斯激光系统进行的一项实验中，激光强度与激波点火条件有关(I >1016 W/cm2)时，利用Kα时间分辨成像、硬x射线滤波(韧致辐射炮)和电子能谱等辅助诊断方法研究了热电子的加热和输运。采用低Z(聚对二甲苯N)和高Z(镍)两种不同组成的烧蚀体，在多层平面靶材中产生不同日冕温度和碰撞强度的等离子体，改变了热电子产生的条件。各种可用的诊断方法可以充分表征热电子的种群，检索它们的转换效率、时间产生和持续时间、温度和角发散。所得结果与详细的模拟和类似的惯性约束聚变实验结果一致。根据实测数据，讨论了实验诊断的优点、可靠性和互补性。

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来源期刊

Matter and Radiation at Extremes Physics and Astronomy-Atomic and Molecular Physics, and Optics

CiteScore

8.60

自引率

9.80%

发文量

160

审稿时长

15 weeks

期刊介绍： Matter and Radiation at Extremes (MRE), is committed to the publication of original and impactful research and review papers that address extreme states of matter and radiation, and the associated science and technology that are employed to produce and diagnose these conditions in the laboratory. Drivers, targets and diagnostics are included along with related numerical simulation and computational methods. It aims to provide a peer-reviewed platform for the international physics community and promote worldwide dissemination of the latest and impactful research in related fields.