Comparative Analysis of Gyrotrons Driven by External Signals

Terahertz gyrotrons in harmonic operation offer the magnetic-field reduction, but they also easily generate various competing modes that operate at low harmonics. In this paper, we used a nonlinear multi-mode code to comparatively analyze the second-harmonic TE 8,9 -mode backward-wave-driven gyrotron, forward-wave-driven gyrotron, and gyrotron traveling-wave amplifier (gyro-TWA).