A 0.4-THz Second Harmonic Gyrotron with Quasi-Optical Confocal Cavity

被引：0
作者：
Xiaotong Guan
Wenjie Fu
Yang Yan
机构：
[1] University of Electronic Science and Technology of China,Terahertz Research Center, School of Physical Electronics
来源：
Journal of Infrared, Millimeter, and Terahertz Waves | 2017年 / 38卷
关键词：
THz; Harmonic gyrotron; Quasi-optical cavity; Cylindrical confocal waveguide; Mode selection;
D O I：
暂无
中图分类号：
学科分类号：
摘要：
Mode density is very relevant for harmonic gyrotron cavity. Theoretical investigations suggest that quasi-optical confocal waveguide performs low mode density and good mode-selective character. By selecting the appropriate mode and optimizing the cavity parameters, the quasi-optical confocal cavity is suitable for high-harmonic terahertz gyrotron without mode competition. In order to verify the theoretical analysis, a 0.4-THz second harmonic gyrotron has been designed and experimented. Driven by a 40-kV, 4.75-A electron beam and 7.51-T magnetic field, the gyrotron prototype could generate 6.44 kW of output power at 395.35 GHz, which corresponds to an electron efficiency of 3.4%. There is no mode competition between the second harmonic and fundamental observed in the experiments.
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页码：1457 / 1470
页数：13
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