Abstract
Effects of magnetic field profiling and tuning on the performance of Ka-band gyrotron traveling wave amplifiers are examined experimentally and verified by theoretical calculations. Regimes of stable and unstable operations are systematically investigated and sources of spontaneous oscillations are identified. It is shown that, through magnetic field profiling and tuning, the gyro-TWT can be optimized for maximum gain, bandwidth, or efficiency. In particular, a power level of 50 kW has been achieved with magnetic field profiling. The performances of severed and unsevered gyro-TWT's are also compared. The addition of a sever is shown to result in very significant improvement in gain and stability. Critical functions of a sever in a gyro-TWT will be also discussed.
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