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Radiation Measurements From A 35 GHz Cyclotron Autoresonance Maser (CARM) Amplifier

Studies of a cyclotron autoresonance maser (CARM) are presented. The measurements are carried out at a frequency of 35 GHz using a mildly relativistic electron beam (1.5 MeV, 260 A) generated by a field emission electron gun followed by an emittance selector that removes the outer, hot electrons. Perpendicular energy is imparted to the electrons by means of a bifilar helical wiggler. Amplification measurements give a small signal gain of approximately 90 dB/m. Computer simulations are also presented.