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W-Band Second-Harmonic Gyrotron Traveling Wave Amplifier with Distributed-Loss and Severed Structures

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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 Δν z/ν z = 5%.

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Authors and Affiliations

  1. Department of Electrical Engineering, Southern Taiwan University of Technology, Tainan, Taiwan, R.O.C

    Yi Sheng Yeh, Chi-Wen Su, Ting-Shu Wu, You-Yan Shin & Yu-Tsung Lo

  2. Department of Communication Engineering, National Penghu Institute of Technology, Penghu, Taiwan, R.O.C

    Chien Lun Hung

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  1. Yi Sheng Yeh
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Yeh, Y.S., Hung, C.L., Su, CW. et al. W-Band Second-Harmonic Gyrotron Traveling Wave Amplifier with Distributed-Loss and Severed Structures. International Journal of Infrared and Millimeter Waves 25, 29–42 (2004). https://doi.org/10.1023/B:IJIM.0000012760.90309.6f

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