Stabilization of Absolute Instabilities in the Gyrotron Traveling Wave Amplifier

K. R. Chu; L. R. Barnett; H. Y. Chen; S. H. Chen; Ch. Wang; Y. S. Yeh; Y. C. Tsai; T. T. Yang; T. Y. Dawn

doi:10.1103/PhysRevLett.74.1103

Stabilization of Absolute Instabilities in the Gyrotron Traveling Wave Amplifier

K. R. Chu, L. R. Barnett, H. Y. Chen, S. H. Chen, Ch. Wang, Y. S. Yeh, Y. C. Tsai, T. T. Yang, and T. Y. Dawn

Phys. Rev. Lett. 74, 1103 – Published 13 February 1995

Abstract

Absolute instabilities in the gyrotron traveling wave amplifier are investigated with a simulation approach which models electron and wave dynamics in the sever and distributed-loss section. Distributed wall losses are shown to be far more effective than the sever in stabilizing these instabilities. Physical interpretations are given and theoretical predictions are verified by a $K_{a}$ -band experiment which achieved 62 kW peak power with 12% bandwidth, 21% efficiency, and 33 dB saturated gain through the use of a mechanically adjustable magnetron injection gun.

Received 17 June 1994

DOI:https://doi.org/10.1103/PhysRevLett.74.1103

Authors & Affiliations

K. R. Chu¹, L. R. Barnett¹, H. Y. Chen¹, S. H. Chen², Ch. Wang³, Y. S. Yeh¹, Y. C. Tsai¹, T. T. Yang³, and T. Y. Dawn²

¹Department of Physics, National Tsing Hua University, Hsinchu, Taiwan
²Department of Nuclear Engineering, National Tsing Hua University, Hsinchu, Taiwan
³RF Group, Synchrotron Radiation Research Center, Hsinchu, Taiwan