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Paper   IPM / Physic / 8601
School of Physics
  Title:   Kinetic Description of A Plasma-Loaded Free-Electron Laser
  Author(s): 
1.  S. Babaei
2.  B. Maraghechi
  Status:   Published
  Journal: Phys. Plasmas
  Vol.:  14
  Year:  2007
  Pages:   053114
  Supported by:  IPM
  Abstract:
A kinetic theory is used to find the dispersion relation of a plasma-loaded free-electron laser that takes into account the velocity spread of both beam and plasma electrons. For the weak-coupling regime, the dispersion relation for a cold electron beam and plasma is obtained and is studied numerically. The kinetic theory predicts that, for the cold beam and plasma, plasma density increases the growth rate of the higher-frequency resonance and lowers it for the lower-frequency resonance up to a certain plasma density. By increasing the plasma density further, a critical density will be reached that diminishes the instability.

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