Abstract-A novel terahertz harmonic gyrotron with dual confocal cavity

Xiaotong Guan, Wenjie Fu, Dun Lu, Tongbin Yang,  Yang Yan

https://ieeexplore.ieee.org/document/8391652/

A novel terahertz harmonic gyrotron with dual confocal cavity has been designed and simulated. The dual confocal waveguide is an improved confocal system to enhance beam-wave interaction efficiency. This terahertz gyrotron is designed to operate in the second harmonic of confocal TE0,11 mode. Particle-In-Cell (PIC) simulation results show that an output power of about 5 kW at 328.93 GHz can be generated when the gyrotron cavity driven by a 40 kV, 2A electron beam with guiding center radius of 1.65 mm and velocity ratio equal to 1.5. The interaction efficiency increases from 1.5% in single focal cavity to 6.2% in dual confocal cavity under the same operation parameters.

Abstract-High harmonic terahertz confocal gyrotron with nonuniform electron beam

Wenjie Fu¹, Xiaotong Guan¹ and Yang Yan¹
http://scitation.aip.org/content/aip/journal/pop/23/1/10.1063/1.4939213
1 THz Research Center, School of Physical Electronics, University of Electronic Science and Technology of China, Chengdu 610054, China
Phys. Plasmas 23, 013301 (2016); http://dx.doi.org/10.1063/1.4939213

The harmonic confocal gyrotron with nonuniform electron beam is proposed in this paper in order to develop compact and high power terahertz radiation source. A 0.56 THz third harmonicconfocal gyrotron with a dual arc section nonuniform electron beam has been designed and investigated. The studies show that confocal cavity has extremely low mode density, and has great advantage to operate at high harmonic. Nonuniform electron beam is an approach to improve output power and interaction efficiency of confocal gyrotron. A dual arc beam magnetron injection gun for designed confocal gyrotron has been developed and presented in this paper.