中国物理B ›› 2013, Vol. 22 ›› Issue (3): 35201-035201.doi: 10.1088/1674-1056/22/3/035201

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

Effect on Landau damping rates for non-Maxwellian distribution function consisting of two electron populations

M. N. S. Qureshia b, S. Seharb, H. A. Shahb, J. B. Caoa   

  1. a Space Science Institute, Beihang University, Beijing 100191, China;
    b Department of Physics, Government College University, Lahore 54000, Pakistan
  • 收稿日期:2012-05-04 修回日期:2012-11-01 出版日期:2013-02-01 发布日期:2013-02-01
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant No. 40931054), the National Basic Research Program of China (Grant No. 2011CB811404), and the Higher Education Commission of China (Grant No. 20-1886/R&D/10).

Effect on Landau damping rates for non-Maxwellian distribution function consisting of two electron populations

M. N. S. Qureshia b, S. Seharb, H. A. Shahb, J. B. Caoa   

  1. a Space Science Institute, Beihang University, Beijing 100191, China;
    b Department of Physics, Government College University, Lahore 54000, Pakistan
  • Received:2012-05-04 Revised:2012-11-01 Online:2013-02-01 Published:2013-02-01
  • Contact: M. N. S. Qureshi E-mail:nouman_sarwar@yahoo.com
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant No. 40931054), the National Basic Research Program of China (Grant No. 2011CB811404), and the Higher Education Commission of China (Grant No. 20-1886/R&D/10).

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摘要： In many physical situations where a laser or electron beam passes through a dense plasma, hot low-density electron populations can be generated, resulting in a particle distribution function consisting of a dense cold population and a small hot population. Presence of such low-density electron distributions can alter the wave damping rate. Kinetic model is employed to study the Landau damping of Langmuir waves when a small hot electron population is present in the dense cold electron population with non-Maxwellian distribution functions. Departure of plasma from Maxwellian distributions significantly alters the damping rates as compared to the Maxwellian plasma. Strong damping is found for highly non-Maxwellian distributions as well as plasmas with higher dense and hot electron population. Existence of weak damping is also established when the distribution contains broadened flat tops at the low energies or tends to be Maxwellian. These results may be applied in both experimental and space physics regimes.

关键词: Landau damping, Langmuir waves, two electron populations, non-Maxwellian distribution function

Abstract: In many physical situations where a laser or electron beam passes through a dense plasma, hot low-density electron populations can be generated, resulting in a particle distribution function consisting of a dense cold population and a small hot population. Presence of such low-density electron distributions can alter the wave damping rate. Kinetic model is employed to study the Landau damping of Langmuir waves when a small hot electron population is present in the dense cold electron population with non-Maxwellian distribution functions. Departure of plasma from Maxwellian distributions significantly alters the damping rates as compared to the Maxwellian plasma. Strong damping is found for highly non-Maxwellian distributions as well as plasmas with higher dense and hot electron population. Existence of weak damping is also established when the distribution contains broadened flat tops at the low energies or tends to be Maxwellian. These results may be applied in both experimental and space physics regimes.

Key words: Landau damping, Langmuir waves, two electron populations, non-Maxwellian distribution function

中图分类号:  (Multicomponent and negative-ion plasmas)

  • 52.27.Cm
52.35.Fp (Electrostatic waves and oscillations (e.g., ion-acoustic waves)) 94.20.wj (Wave/particle interactions)