Abstract
Generation of microwave radiation from a long-pulse rotating electron beam in a circular wiggler magnetic field (circular free electron laser) has been studied. The beam energy is 300–400 kV, typically, and the beam current is 200 A. The radiation frequency is measured with the grating spectrometer to be 12.7 GHz. Measured values agree with the theoretical prediction. The interaction between the beam mode and the TM waveguide mode is discussed, based upon the dispersion relation.
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