Beam Instabilities in Laser-Plasma Interaction: Relevance to Preferential Ion Heating
Beam Instabilities in Laser-Plasma Interaction: Relevance to Preferential Ion Heating
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激光-等离子体相互作用中的光束不稳定性：与优先离子加热的相关性
DOI：
10.1103/physrevlett.94.245002
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发表时间：
2005
影响因子：
8.6
通讯作者：
J. Davies
中科院分区：
文献类型：
--
作者：
J. T. Mendonça;P. Norreys;R. Bingham;J. Davies
我们提出了一种超强激光等离子体中异常离子加热的新机制。该机制基于电子双流不稳定性的激发，该电子双流不稳定性由共振衰减为离子声波的快速电子束驱动。然后，这些低频波会因致密等离子体中的离子碰撞而受到强烈阻尼。该模型对最近拍瓦级激光实验中观察到的大块离子群的优先加热给出了简单的解释。特别是，这项工作为锥引导快速点火实验中 Au 和 CD 等离子体中不同的能量损失提供了解释。
We propose a new mechanism for anomalous ion heating in ultraintense laser plasmas. This mechanism is based on the excitation of an electron two-stream instability that is driven by the fast electron beam that resonantly decays into ion-acoustic waves. These low frequency waves are then strongly damped by the ion collisions in the dense plasma. The model gives a simple explanation for the preferential heating of the bulk ion population observed in recent laser experiments in the petawatt regime. In particular, this work provides an explanation for the different energy loss in the Au and CD plasmas, in cone-guided fast ignition experiments.