Abstract
Confocal waveguide gyrotron traveling wave tube (gyro-TWT) is a novel gyrotron amplifier which can operate in higher order modes and generate high power. In this paper, the linear theory derived from kinetic theory is presented to analyze a 0.22-THz confocal waveguide Gyro-TWT which operates at HE06 mode. The linear gain is 9.6 dB/cm at 220.2 GHz. Different parameters are pointed out to show their influences on critical current of absolute instability.
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