Radiation-pressure-driven ion Weibel instability and collisionless shocks
Radiation-pressure-driven ion Weibel instability and collisionless shocks
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DOI：
10.1103/physreve.96.033204
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发表时间：
2017-09-25
影响因子：
2.4
通讯作者：
Riconda, C.
中科院分区：
文献类型：
--
作者：
Grassi, A.;Grech, M.;Riconda, C.
逆流等离子体流的韦伯不稳定性是天体物理学中与无碰撞激波形成密切相关的一个基本过程。本文通过二维和三维模拟，研究了在超高强度激光脉冲(“打孔”过程)的辐射压力下，快速准中性等离子体流发射到靶上的离子-韦伯不稳定性(IWI)的合适构型。在倾斜入射时使用S偏振光是驱动IW的最佳配置，因为它防止了在垂直入射时观察到的表面波纹的发展，这种波纹将导致强烈的电子加热，并将有利于竞争不稳定性。文中还研究了IW演化为无碰撞激波的条件。
The Weibel instability from counterstreaming plasma flows is a basic process highly relevant for collisionless shock formation in astrophysics. In this paper we investigate, via two-and three-dimensional simulations, suitable configurations for laboratory investigations of the ionWeibel instability (IWI) driven by a fast quasineutral plasma flow launched into the target via the radiation pressure of an ultra-high-intensity laser pulse ("hole-boring" process). The use of S-polarized light at oblique incidence is found to be an optimal configuration for driving IWI, as it prevents the development of surface rippling observed at normal incidence that would lead to strong electron heating and would favor competing instabilities. Conditions for the evolution of IWI into a collisionless shock are also investigated.