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Paper   IPM / Physic / 7368
School of Physics
  Title:   Wiebel Instability of Microwave Gas Dischrage in Strong Linear and Circular Pulsed Fields
1.  B. Shokri
2.  M. Ghorbanalilu
  Status:   Published
  Journal: Phys. Plasmas
  No.:  6
  Vol.:  11
  Year:  2004
  Pages:   2989-2993
  Supported by:  IPM
Being much weaker than the atomic fields, the gas breakdown produced by high-power pulsed microwave fields is investigated in the nonrelativistic case. The distribution function of the electrons produced by the interaction with intense linearly and circularly polarized microwave fields is obtained and it is shown that it is in a nonequilibrium state and anisotropic. The discharge mechanism for the gas atoms is governed by electron-impact avalanche ionization. By analyzing the instability of the system and by finding its growth rate, it is shown that the instability which is governed by the anisotropic property of the distribution function is Wiebel instability.

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