Abstract
The design of a Ka-band gyrotron traveling wave amplifier with high power and wide bandwidth is presented in detail. The amplifier operates in the TE11 circular mode at the fundamental cyclotron harmonic. The distributed loss technique is adopted in the interaction circuit which guarantees the amplifier zero-drive stability. The effects of the parameters such as input power, driver frequency and magnetic field on the performance of the gyro-TWT are discussed. The simulation results show that the gain and the 3dB bandwidth of the designed Ka-band gyro-TWT are about 56.0dB and 1.8 GHz ,respectively. The peak output power and the corresponding electronic efficiency are about 100 kW and 23.8% respectively with the voltage 70 kV and the current 6A at the velocity ratio 1.0.
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