Near millimeter wave radiation from a gyromonotron

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Abstract
A cyclotron resonance maser oscillator, or gyromonotron, has been designed to produce radiation at a 1 25 mm wavelength by its operation at the second harmonic of the cycloctron cyclotron frequency in on applied magnetic field of 45 kG. Based on linear gyrotron theory and electron orbit computer simulations, an output power in the 1 to 10 kW range at an efficiency of or exceeding 10% should be achievable. In initial tests of this tube, more than 50 W of radiation at both the first and second harmonics wore observed at various values of applied magnetic field. However, beam interception necessitated modifications in tube construction. The modified tube was an efficient first harmonic radiator, but the second harmonic was suppressed. Further modifications to the tube necessary to obtain the second harmonic radiation are currently under investigation.

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