Dispersion relation and growth rate in two-stream thermal plasma-loaded free-electron laser with helical wiggler
محورهای موضوعی : Journal of Theoretical and Applied Physics
S. Meydanloo
1
(Plasma Physics Research Center, Science and Research Branch, Islamic Azad University)
S. Saviz
2
(Plasma Physics Research Center, Science and Research Branch, Islamic Azad University)
کلید واژه: Two, stream free, electron laser, Thermal plasma,
چکیده مقاله :
AbstractLinear theory of the two-stream free-electron laser consisting of a relativistic electron beam transported along the axis of thermal plasma-loaded helical wiggler is proposed and investigated. The dispersion relation is derived employing linear fluid theory. The characteristics of the dispersion relation are analyzed by numerical solutions. The results show in that in the special values of the plasma temperature the growth rate is considerably enhanced. It is also shown that the growth rate after critical plasma density gradually decreases. Moreover, in the presence of the two-electron beam the growth rate of electrostatic mode is two times greater than that for electromagnetic mode.
