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arXiv 2203.07152physics.plasm-phphysics.atom-phphysics.flu-dyn
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低Z弱耦合等离子体逆韧致辐射加热的经典分子动力学模拟

Classical molecular dynamic simulations and modelling of inverse-bremsstrahlung heating in low Z weakly-coupled plasmas

Ronan Devriendt, Olivier Poujade

摘要:

经典的分子动力学模拟(CMDS)研究了物质吸收辐射的主要机制之一,即受激逆韧致辐射。使用LAMMPS代码,用200万个粒子对大范围的电子密度、电子温度、电离$Z=1$的两组分等离子体(电子和离子)进行CMDS。一个参数化的模型(6个可调常数),其中包括在过去提出的最理论模型,以量化加热速率的刺激逆韧致辐射,作为一个参考比较我们的模拟。CMDS的结果足够精确,可以排除这些过去模型中的元素,例如库仑库仑定律仅取决于激光脉动$ω$,而不取决于强度。对参数化模型的6个常数进行了调整,得到的模型与我们的CMDS结果和文献中的CMDS结果相匹配。

英文摘要:

Classical molecular-dynamics simulations (CMDS) have been conducted to investigate one of the main mechanism responsible for absorption of radiation by matter namely stimulated inverse bremsstrahlung. CMDS of two components plasmas (electrons and ions) for a large range of electron densities, electron temperatures, for ionization $Z=1$, were carried out with 2 million particles using the code LAMMPS. A parameterized model (with 6 adjustable constants), which encompasses most theoretical models proposed in the past to quantify heating rate by stimulated inverse bremsstrahlung, serves as a reference for comparison to our simulations. CMDS results are precise enough to rule out elements of these past models such as coulomb logarithms depending solely upon laser pulsation $ω$ and not upon intensity. The 6 constants of the parameterized model have been adjusted and the resulting model matches all our CMDS results and those of previous CMDS in the literature.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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