Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1772818 | High Energy Density Physics | 2008 | 5 Pages |
Abstract
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.
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Authors
I.A. Andriyash, V.Yu. Bychenkov, W. Rozmus,