W-Band Second-Harmonic Gyrotron Traveling Wave Amplifier with Distributed-Loss and Severed Structures |
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Authors: | Yi Sheng Yeh Chien Lun Hung Chi-Wen Su Ting-Shu Wu You-Yan Shin Yu-Tsung Lo |
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Affiliation: | (1) Department of Electrical Engineering, Southern Taiwan University of Technology, Tainan, Taiwan, R.O.C;(2) Department of Communication Engineering, National Penghu Institute of Technology, Penghu, Taiwan, R.O.C |
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Abstract: | The second harmonic TE02 gyrotron traveling wave amplifier (gyro-TWT) is a high-power, broadband, millimeter-wave amplifier with a low applied magnetic field. Mode-selective interaction circuits were applied to suppressing spurious oscillations. However, the mode-selective interaction circuit may perturb the operating mode in the gyro-TWT. A multi-stage gyro-TWT design with distributed-loss and severed structures is proposed to stabilize the amplification. This study presents a nonlinear analysis of typical oscillations, including absolute instability, gyrotron backward oscillation (gyro-BWO) and reflective oscillation. The lossy and severed sections of the multi-stage gyro-TWT seem to increase effectively the start-oscillation currents of the absolute instability, gyro-BWO, and reflection oscillation. The multi-stage gyro-TWT is predicted to yield a peak output power of 215 kW at 89.9 GHz with an efficiency of 14.3 %, a saturated gain of 60 dB and a bandwidth of 1.7 GHz for a 100 kV, 15 A electron beam with an axial velocity spread z/z = 5%. |
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Keywords: | Gyrotron traveling wave amplifier absolute instability gyrotron backward oscillation reflective oscillation distributed wall loss attenuating sever |
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