W-band TE01 gyrotron backward-wave oscillator with distributed loss

被引：24
作者：
Chang, T. H. [1 ]
Yu, C. F. [1 ]
Hung, C. L. [2 ]
Yeh, Y. S. [3 ]
Hsiao, M. C. [3 ]
Shin, Y. Y. [3 ]
机构：
[1] Natl Tsing Hua Univ, Dept Phys, Hsinchu 300, Taiwan
[2] Natl Penghu Univ, Dept Commun Engn, Penghu, Taiwan
[3] So Taiwan Univ, Dept Electroopt Engn, Tainan, Taiwan
来源：
PHYSICS OF PLASMAS | 2008年 / 15卷 / 07期
关键词：
D O I：
10.1063/1.2950305
中图分类号：
O35 [流体力学]; O53 [等离子体物理学];
学科分类号：
070204 ; 080103 ; 080704 ;
摘要：
Distributed wall loss is proposed to enhance the stability and tunability of a W-band TE01 gyrotron backward-wave oscillator (gyro-BWO). Simulation results reveal that loss effectively suppresses the unwanted transverse modes as well as the high-order axial modes (HOAMs) without degrading the performance of a gyro-BWO that operates at the fundamental axial mode. Linear and nonlinear codes are used to calculate the interaction properties. The effects of the distributed loss on the starting currents of all of the modes of interest are discussed in depth. The interacting structure is optimized for stability. The calculated peak output power is 102 kW, corresponding to an efficiency of 20%. The 3 dB tuning bandwidth is 1.8 GHz, centered at 94.0 GHz when using 5 A and 100 kV electron beam. (C) 2008 American Institute of Physics.
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页数：6
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