Experimental Observations of Microwave Emission from a 35 GHz Cyclotron Autoresonant Maser. (Final Report for June 1986-July 1990).

摘要

Measurements of microwave emission from a 35 GHz cyclotron autoresonance maser single-pass amplifier are reported. The maser operates in an axial magnetic field of 6 kilogauss and uses a mildly relativistic electron beam (1.5 MeV, 130A) of 30 ns duration. Electrons are imparted perpendicular velocity by means of a bifilar helical wiggler. Peak power from the CARM is 12.2 MW, which corresponds to an efficiency of 6.3% with a linear growth rate of 50 dB/m. The experiment operates in the fundamental TE11 mode of a circular waveguide. During amplifier operation of 17 kW signal is injected from a 35 GHz magnetron. When the CARM is operated as a superradiant amplifier (amplification of background noise.), evidence of multimoding is observed. Numerical simulations that utilize the results of beam dynamics calculations as input into the CARM simulations are in good agreement with experimental results. Theses. (RH)