Self-fields in a free-electron laser with electromagnetic-wave wiggler and ion-channel guiding

Mehdian, H.; Hasanbeigi, A.; Jafari, S.
December 2008
Physics of Plasmas;Dec2008, Vol. 15 Issue 12, p123101
Academic Journal
A theory of self-fields in a free-electron laser with electromagnetic-wave wiggler and ion-channel guiding is presented. The equations of motion for an electron have been analyzed. This equation together with its numerical solutions shows that the first part of group I and II trajectories is unstable. The effects of self-fields on the gain for groups I and II orbits have also been investigated by deriving the gain formula and numerical calculation. A gain decrement is found due to the effects of self-fields for group I orbits, and the gain enhancement for group II orbits. The gain decrement (enhancement) arises from diamagnetic (paramagnetic) generated by the self-fields. The gain decrement (enhancement) increases by increasing the beam density.


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