Evolution of High Energy Density in Plasma Formed upon Irradiation of Steel Foils by Ultrarelativistic Femtosecond Laser Pulses

IF 1.1 4区 物理与天体物理 Q4 PHYSICS, FLUIDS & PLASMAS
M. V. Sedov, M. A. Alkhimova, S. S. Makarov
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Abstract

Results of the particle-in-cell simulation that illustrate evolution of parameters of laser-produced plasma formed upon irradiation of steel foils with a thickness of 1–5 µm by femtosecond laser pulses with intensity of ≥5 × 1021 W/cm2 are presented. Analytical estimates for analysis of energy dissipation in a foil of finite thickness are obtained. Numerical simulations are compared with the results of the recent experiment in which diagnostics of plasma parameters was carried out by methods of X-ray spectroscopy. The results of simulation agree with the experimental results and confirm that a microscopic-sized plasma source with energy density exceeding 1 GJ/cm3 and lifetime of about 500 fs can be formed as a result of action of high-contrast femtosecond laser pulses of ultrarelativistic intensity. In addition, simulations demonstrate that a plasma source with a volume of ~1 µm3 and lifetime of ~5 light periods that has parameters close to those existing inside the Sun, i.e., the temperature of ~1–3 keV and energy density of ≥10 GJ/cm3 (pressure of ≥100 Gbar), can be formed under the same parameters of the experiment.

Abstract Image

超相对论飞秒激光脉冲辐照钢箔后等离子体高能量密度的演化
本文给出了用强度≥5 × 1021 W/cm2的飞秒激光脉冲照射厚度为1 ~ 5µm的钢箔后激光等离子体参数变化的粒子池模拟结果。给出了有限厚度箔片能量耗散分析的解析估计。数值模拟结果与最近用x射线光谱学方法诊断等离子体参数的实验结果进行了比较。模拟结果与实验结果一致,证实了在超相对论强度的高对比度飞秒激光脉冲作用下,可以形成能量密度超过1 GJ/cm3、寿命约500 fs的微观等离子体源。此外,模拟结果表明,在相同的实验参数下,可以形成体积为~1 μ m3、寿命为~5个光周期的等离子体源,其参数与太阳内部的参数接近,即温度为~1 - 3 keV,能量密度≥10 GJ/cm3(压力≥100 Gbar)。
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
Plasma Physics Reports
Plasma Physics Reports 物理-物理:流体与等离子体
CiteScore
1.90
自引率
36.40%
发文量
104
审稿时长
4-8 weeks
期刊介绍: Plasma Physics Reports is a peer reviewed journal devoted to plasma physics. The journal covers the following topics: high-temperature plasma physics related to the problem of controlled nuclear fusion based on magnetic and inertial confinement; physics of cosmic plasma, including magnetosphere plasma, sun and stellar plasma, etc.; gas discharge plasma and plasma generated by laser and particle beams. The journal also publishes papers on such related topics as plasma electronics, generation of radiation in plasma, and plasma diagnostics. As well as other original communications, the journal publishes topical reviews and conference proceedings.
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