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

作者：Guan, Xiaotong^*; Fu, Wenjie; Yan, Yang

来源：Journal of Infrared Millimeter and Terahertz Waves, 2017, 38(12): 1457-1470.

DOI：10.1007/s10762-017-0432-8

• THz
• Harmonic gyrotron
• Quasi-optical cavity
• Cylindrical confocal waveguide
• Mode selection

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.

• 出版日期2017-12
• 单位电子科技大学