Raman amplification in plasma. Wavebreaking and heating effects
Raman amplification in plasma. Wavebreaking and heating effects
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DOI：
10.1063/1.3492713
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发表时间：
2010-11-01
影响因子：
2.2
通讯作者：
Jaroszynski, D. A.
中科院分区：
文献类型：
--
作者：
Farmer, J. P.;Ersfeld, B.;Jaroszynski, D. A.
本文提出了一个三波模型，研究了波的破碎和热效应对等离子体中拉曼放大的影响。这一模型与粒子模拟程序进行了比较，得到了肯定的结果。这里，由于单色泵对等离子体的加热而引起的等离子体共振的偏移允许探测脉冲被放大和压缩，显著的泵浦损耗在阻尼占主导地位的情况下，发现逆韧致辐射在高密度下占主导地位，并且可以通过在低密度或高泵浦强度下预热等离子体来实现改进的生长速率，由于在有限的温度（C）下降低了波破碎极限，因此热效应的加入可以显著降低可达到的峰值强度。2010年美国物理学会[doi 10 1063/1 3492713]
A three-wave model has been developed to investigate the influence of wavebreaking and thermal effects on the Raman amplification in plasma This has been benchmarked against a particle-in-cell code with positive results A new regime, the "thermal chirp" regime, has been identified and illustrated Here the shift in plasma resonance due to heating of the plasma by a monochromatic pump allows a probe pulse to be amplified and compressed without significant pump depletion In regimes where damping dominates, it is found that inverse bremsstrahlung dominates at high densities, and improved growth rates may be achieved by preheating the plasma At low densities or high pump intensities, wavebreaking acts to limit amplification The inclusion of thermal effects can dramatically reduce the peak attainable intensity because of the reduced wavebreaking limit at finite temperatures (C) 2010 American Institute of Physics [doi 10 1063/1 3492713]