Nonlinear Landau damping of high frequency waves in non-Maxwellian plasmas  

作　　者：M.N.S.Qureshi Sumbul Sehar J.K.Shi H.A.Shah 

机构地区：[1]Department of Physics,GC University [2]Center for Space Science and Applied Research,Chinese Academy of Sciences

出　　处：《Chinese Physics B》2013年第11期385-389,共5页中国物理B（英文版）

基　　金：Project supported by the Pakistan Science Foundation Project No.PSF/Res/P-GCU/Phys.(143);the National Natural Science Foundation of China(Grant Nos.41074114 and 41274146);the Specialized Research Fund for State Key Laboratories of China

摘　　要：Space plasmas often possess non-Maxwellian distribution functions which have a significant effect on the plasma waves. When a laser or electron beam passes through a dense plasma, hot low density electron populations can be generated to alter the wave damping/growth rate. In this paper, we present theoretical analysis of the nonlinear Landau damping for Langmuir waves in a plasma where two electron populations are found. The results show a marked difference between the Maxwellian and non-Maxwellian instantaneous damping rates when we employ a non-Maxwellian distribution function called the generalized （r, q） distribution function, which is the generalized form of the kappa and Maxwellian distribution functions. In the limiting case of r = 0 and q→∞, it reduces to the classical Maxwellian distribution function, and when r = 0 and q→k ＋1, it reduces to the kappa distribution function.Space plasmas often possess non-Maxwellian distribution functions which have a significant effect on the plasma waves. When a laser or electron beam passes through a dense plasma, hot low density electron populations can be generated to alter the wave damping/growth rate. In this paper, we present theoretical analysis of the nonlinear Landau damping for Langmuir waves in a plasma where two electron populations are found. The results show a marked difference between the Maxwellian and non-Maxwellian instantaneous damping rates when we employ a non-Maxwellian distribution function called the generalized （r, q） distribution function, which is the generalized form of the kappa and Maxwellian distribution functions. In the limiting case of r = 0 and q→∞, it reduces to the classical Maxwellian distribution function, and when r = 0 and q→k ＋1, it reduces to the kappa distribution function.

关 键 词：nonlinear Landau damping non-Maxwellian distribution function nonlinear Langmuir waves wave-particle interaction 

分 类 号：O53[理学—等离子体物理]