Stability properties of free-electron laser in Raman regime with thermal electron beam

Chakhmachi, A.; Maraghechi, B.
April 2009
Physics of Plasmas;Apr2009, Vol. 16 Issue 4, p043110
Academic Journal
In the context of kinetic theory an expression for the growth rate of a free-electron laser, under the weak resonance instability condition, for full dispersion relation has been obtained. The space-charge potential is included in the analysis and the expression for growth rate reduces to that of the Compton regime under the low density condition. With the assumption of a spread in the longitudinal momentum in the form of a Gaussian distribution function, the effect of the thermal electron beam on the growth rate is studied. The results are compared to another linear theory, a computer simulation, and an experiment.


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