Nonstationary laser-supported ionization wave in layer of porous substance with subcritical density

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

Matter and Radiation at Extremes Pub Date : 2023-11-14 DOI:10.1063/5.0157904

S. Yu Gus’kov, R. A. Yakhin

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Abstract

A time-dependent analytical solution is found for the velocity of a plane ionization wave generated under nanosecond laser pulse action on the surface of a flat layer of low-Z porous substance with density less than the critical density of the produced plasma. With corrections for the two-dimensional nature of the problem when a laser beam of finite radius interacts with a flat target, this solution is in quantitative agreement with measurements of ionization wave velocity in various experiments. The solution compared with experimental data covering wide ranges of performance conditions, namely, (3–8) × 1014 W cm−2 for laser pulse intensity, 0.3–3 ns for pulse duration, 0.35–0.53 μm for laser wavelength, 100–1000 μm for laser beam radius, 380–950 μm for layer thickness, 4.5–12 mg cm−3 for average density of porous substance, and 1–25 μm for average pore size. The parameters of the laser beam that ensure the generation of a plane ionization wave in a layer of subcritical porous matter are determined for the problem statements and are found to meet the requirements of practical applications.

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亚临界密度多孔物质层中非稳态激光支持的电离波

在纳秒激光脉冲作用下，在密度小于等离子体临界密度的低z多孔物质的平面层表面产生平面电离波的速度，得到了随时间变化的解析解。当有限半径的激光束与平面目标相互作用时，对问题的二维性质进行了修正，该解与各种实验中电离波速度的测量结果在定量上一致。该方案与实验数据进行了比较，实验数据涵盖了广泛的性能条件，即激光脉冲强度为(3 - 8)× 1014 W cm−2，脉冲持续时间为0.3-3 ns，激光波长为0.35-0.53 μm，激光束半径为100-1000 μm，层厚为380-950 μm，多孔物质平均密度为4.5-12 mg cm−3，平均孔径为1-25 μm。为问题表述确定了保证在亚临界多孔物质层中产生平面电离波的激光束参数，并发现这些参数满足实际应用的要求。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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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.