相对论电子束在等离子体中的能量沉积  

Energy deposition of relativistic electron beam in plasmas

作　　者：刘占军[1] 郑春阳[1] 李斌[1] 朱少平[1] 曹莉华[1] 

机构地区：[1]北京应用物理与计算数学研究所,北京100088

出　　处：《强激光与粒子束》2005年第1期79-82,共4页High Power Laser and Particle Beams

基　　金：国家自然科学基金资助课题(10335020;10375011);国家863计划项目资助课题;中国工程物理研究院基金资助课题

摘　　要：用3维粒子模拟程序LARED P研究了束 等离子体不稳定性,不稳定性激发的强电磁场使电 子束在非常短的距离内沉积能量。对于10MeV的单能电子束,束电子数目占总电子数目5%的情况下,最终 约损失14%的束能量。推导了等离子体的色散关系,得出了增长率。Weibel instability is studied by three dimensional particle in cell simulation code LARED-P. The generated magnetic field and currents by Weibel instability present filamentary structure. When the Weibel instability reaches the saturation stage, the current filaments begin to interact with each other. The relativistic electron beam deposits part of its energy into the plasmas through instabilities. For 10 MeV electrons, when the beam electron density concentrates 5% of the total electron density, 14% energy of beam can be deposited at last. The dispersion relation in this case also deduced, the growth rate is obtained in some simple cases.

关 键 词：集体相互作用 Weibel不稳定性 能量沉积 粒子模拟 

分 类 号：O534[理学—等离子体物理]