Microwave radiation from a low-energy rotating electron beam in an azimuthally periodic magnetic wiggler field
Abstract
The generation of microwave radiation by the interaction
of a low-energy rotating electron beam (25 kV, 0.5 A, 5 ps) with an
azimuthally periodic magnetic wiggler field has been studied experimentally.
Narrow-band radiation has been observed at a frequency of
10.15 GHz at power levels of about 100 W, corresponding to an electronic
efficiency of about 1 percent. Results are in reasonable agreement
with theoretical expectations when the electron cyclotron frequency
is adjusted to account for a precession in the electron orbits
caused by the wiggler field.
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