Abstract
The electron dynamics in the inverse FEL accelerator is investigated by a 1D FEL simulation code. The electron bunch length in acceleration buckets and the trapping fraction are found to vary when the gradient of wiggler field tapering is changed. When an infrared laser of 60 GW is focused to a 200 μm diameter laser spot, the maximum acceleration rate reaches 100 MeV/m and the bunch length is about 115 of the laser wavelength. As a realistic case study, FInite bandwidth of the laser field has to be taken into account. The critical bandwidth is found to be approximately a betatron oscillation frequency.
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