中国物理B ›› 2013, Vol. 22 ›› Issue (11): 115201-115201.doi: 10.1088/1674-1056/22/11/115201

• PHYSICS OF GASES, PLASMAS, AND ELECTRIC DISCHARGES • 上一篇    下一篇

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

M. N. S. Qureshia b, Sumbul Sehara, J. K. Shib, H. A. Shaha   

  1. a Department of Physics, GC University, Lahore;
    b Center for Space Science and Applied Research, Chinese Academy of Sciences, Beijing 100190, China
  • 收稿日期:2013-03-11 修回日期:2013-05-28 出版日期:2013-09-28 发布日期:2013-09-28
  • 基金资助:
    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), and the Specialized Research Fund for State Key Laboratories of China.

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

M. N. S. Qureshia b, Sumbul Sehara, J. K. Shib, H. A. Shaha   

  1. a Department of Physics, GC University, Lahore;
    b Center for Space Science and Applied Research, Chinese Academy of Sciences, Beijing 100190, China
  • Received:2013-03-11 Revised:2013-05-28 Online:2013-09-28 Published:2013-09-28
  • Contact: M. N. S. Qureshi E-mail:nouman_sarwar@yahoo.com
  • Supported by:
    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), and the Specialized Research Fund for State Key Laboratories of China.

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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.

关键词: nonlinear Landau damping, non-Maxwellian distribution function, nonlinear Langmuir waves, wave–particle interaction

Abstract: 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.

Key words: nonlinear Landau damping, non-Maxwellian distribution function, nonlinear Langmuir waves, wave–particle interaction

中图分类号:  (Plasma kinetic equations)

  • 52.25.Dg
52.27.Cm (Multicomponent and negative-ion plasmas) 52.35.Fp (Electrostatic waves and oscillations (e.g., ion-acoustic waves)) 52.35.Mw (Nonlinear phenomena: waves, wave propagation, and other interactions (including parametric effects, mode coupling, ponderomotive effects, etc.))