First results are presented of a free-electron-laser experiment that utilizes a tapered wiggler for efficiency enhancement. The spontaneous spectrum and the electron-beam energy loss due to the free-electron-laser interaction are measured and compared with theory. With a 2.25% magnetic field taper, 12% of the electrons were decelerated by 0.6%, corresponding to a gain of 2.7% and an efficiency of 0.07%, which is 10 times higher than that calculated for a zero taper and otherwise identical conditions.
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Boehmer et al. (1982) studied this question.
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