The performance of cyclotron autoresonance maser amplifiers can be significantly improved by using a properly spatially profiled helical wiggler. The proposed configuration is able to alleviate the severe problem of performance degradation by beam velocity spread. Simulation results show that more than 20% output efficiency can still be attained at 94 GHz, even with 5% beam velocity spread.
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Lin et al. (1997) studied this question.
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