Two decades of progress in understanding and control of laser plasma instabilities in indirect drive inertial fusion
Two decades of progress in understanding and control of laser plasma instabilities in indirect drive inertial fusion
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DOI：
10.1063/1.4946016
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发表时间：
2016-05-01
影响因子：
2.2
通讯作者：
Montgomery, David S.
中科院分区：
文献类型：
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作者：
Montgomery, David S.
在过去的二十年里，我们对激光等离子体不稳定性（LPI）物理的理解通过实验技术、诊断以及理论和建模方法的进步而得到了显着改善。我们已经取得了进展，从单束实验纳秒脉冲与类似kJ的能量入射到百微米尺度的目标等离子体与类似keV的电子温度的涉及近2MJ的能量在192束到多毫米尺度的等离子体的温度类似于4 keV。与此同时，我们还能够使用较小规模的激光设施来大幅提高我们对LPI物理的理解，并评估控制它们的新方法。这些努力导致了LPI研究范式的变化，开创了一个工程LPI的时代，以实现特定的目标，从调整胶囊内爆对称性到将LPI过程的非线性饱和固定在可接受的水平，以实现在新的等离子体机制中探索高能量密度物理。提供了一个教程，从基础LPI实验结果的Vantage，审查在该领域的进展。将采用最简单的LPI模型的教学框架，但也将注意到需要更复杂的模型来理解观察结果的设置。还将讨论我们对惯性聚变（间接和直接驱动）和其他应用的改进理解的应用前景。出版社：AIP Publishing
Our understanding of laser-plasma instability (LPI) physics has improved dramatically over the past two decades through advancements in experimental techniques, diagnostics, and theoretical and modeling approaches. We have progressed from single-beam experiments-ns pulses with similar to kJ energy incident on hundred-micron-scale target plasmas with similar to keV electron temperatures-to ones involving nearly 2MJ energy in 192 beams onto multi-mm-scale plasmas with temperatures similar to 4 keV. At the same time, we have also been able to use smaller-scale laser facilities to substantially improve our understanding of LPI physics and evaluate novel approaches to their control. These efforts have led to a change in paradigm for LPI research, ushering in an era of engineering LPI to accomplish specific objectives, from tuning capsule implosion symmetry to fixing nonlinear saturation of LPI processes at acceptable levels to enable the exploration of high energy density physics in novel plasma regimes. A tutorial is provided that reviews the progress in the field from the vantage of the foundational LPI experimental results. The pedagogical framework of the simplest models of LPI will be employed, but attention will also be paid to settings where more sophisticated models are needed to understand the observations. Prospects for the application of our improved understanding for inertial fusion (both indirect-and direct-drive) and other applications will also be discussed. Published by AIP Publishing.