Abstract
An electron beam coupled to an undulator magnet and a radiation field can exhibit a collective instability.1 In this mode the electron beam is microbunched at the radiation wavelength and generates coherent radiation. The efficiency of energy transfer from the electron beam to the radiation field is a function of the beam current and the beam quality. We examine the effects of both an angular and an energy spread in the incident electron beam on the efficiency. For a 500-MeV electron beam with characteristics obtainable in a storage ring, one can produce coherent radiation in the 10-50-Å region with an efficiency on the order of 0.1%, peak and average powers on the order of 1 GW and 1 W, respectively, and a linewidth of about 10−6.
© 1984 Optical Society of America
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