Abstract
In contrast with the conventional injector consisting of dc gun, chopper, subharmonic buncher and/or fundamental buncher, a microwave gun can cooperate with an alpha magnet as a more compact high brightness injector for the dedicated rf linear accelerators driving infrared free electron lasers (FELs). Such a concept has been put into practice in the MARK III FEL and will be used in the Beijing Free Electron Laser (BFEL) as well. In this paper, the phase spread, energy spread, energy spread, emittance growth and intensity variation of a single electron microbunch in such an FEL accelerator system are investigated using SUPERFISH and PARMELA.
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