Evolution of photoionization two-stream instability in collisional plasma

被引:8
作者
Andriyash, I. A. [2 ]
Bychenkov, V. Yu [2 ]
Rozmus, W. [1 ]
机构
[1] Univ Alberta, Inst Theoret Phys, Dept Phys, Edmonton, AB T6G 2J1, Canada
[2] Russian Acad Sci, PN Lebedev Phys Inst, Moscow 119991, Russia
基金
加拿大自然科学与工程研究理事会;
关键词
Plasma instability; Free electron laser; Photoionization; X-ray pulse; Gas jet plasma;
D O I
10.1016/j.hedp.2008.03.001
中图分类号
O35 [流体力学]; O53 [等离子体物理学];
学科分类号
070204 ; 080103 ; 080704 ;
摘要
A kinetic model which takes into account gas jet photoionization by an ultrashort linearly polarized EUV/X-ray free electron laser (FEL) pulse, a self-generated low frequency electric field, and elastic electron scattering on atoms is introduced to study the photoionization two-stream (PITS) instability. The evolution of PITS instability is described in terms of an integral equation for electron density perturbations. This paper presents a generalization of previous theories of the PITS instability in collisionless plasmas. The instability is produced by the anisotropy of photoionized electrons and is strongly affected by electron-atom collisions. Relaxation of the PITS instability is studied for different relations between the FEL pulse duration, the instability growth time, and the electron collision time. (C) 2008 Elsevier B.V. All rights reserved.
引用
收藏
页码:73 / 77
页数:5
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