Discharge processes in Gases

• Electron production

  • α- action
    • collisional ionization of electron and atom.
    • N=n0exp(αd) α：collisional ionization coefficient
  • γ- action
    • electron releasing process from surface of cathode
    • N=γn0

• Townsend 理論

  • Applied to low pressure and short gap size
  • disregard the space charge effect
    • mechanism of sparking

• Streamer理論

  • regarding the space charge effect of plus ions.
    • Electrons make avalanche in the direction of the plus ion cloud
    • When（the field caused by plus ion） = （Applied field）, electron avalanche converts to streamer.

d

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