Ultrahigh Gain Gyrotron Traveling Wave Amplifier

K. R. Chu, H. Y. Chen, C. L. Hung, T. H. Chang, L. R. Barnett, S. H. Chen, and T. T. Yang
Phys. Rev. Lett. 81, 4760 – Published 23 November 1998
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Abstract

Mode competition in the gyrotron traveling wave amplifier is shown to be intricately connected to the interplay between the absolute/convective instabilities, circuit losses, and reflective feedback. Physical origins of spurious oscillations are analyzed and characterized. Fundamental understanding of these processes leads to a device concept which provides zero-drive stability at ultrahigh gain. The scheme was verified in a proof-of-principle experiment in the Ka band, producing 93 kW saturated peak power at 26.5% efficiency, 70 dB gain, and a 3 dB bandwidth of 3 GHz.

  • Received 29 July 1998

DOI:https://doi.org/10.1103/PhysRevLett.81.4760

©1998 American Physical Society

Authors & Affiliations

K. R. Chu, H. Y. Chen, C. L. Hung, T. H. Chang, and L. R. Barnett

  • Department of Physics, National Tsing Hua University, Hsinchu, Taiwan, Republic of China

S. H. Chen

  • National Center for High-Performance Computing, Hsinchu, Taiwan, Republic of China

T. T. Yang

  • Synchrotron Radiation Research Center, Hsinchu, Taiwan, Republic of China

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Issue

Vol. 81, Iss. 21 — 23 November 1998

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