Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
8044907 | Vacuum | 2016 | 17 Pages |
Abstract
Gyrotron oscillators are one of promising sources to generate high power terahertz radiation. To achieve high power at high frequency, gyrotrons have to operate at high order modes to alleviate the problem of wall heating and the miniaturization of interaction structures at these frequencies. Due to high order modes, the mode spectrum is very dense and the electron beam is likely to interact with several modes. Mode competition is a major hurdle in achieving stable and efficient operation of a gyrotron at cyclotron harmonics. The gradually tapered complex cavity could suppress mode competition by locking a pair of operating modes in two single cavities. Starting from the general transmission line equations with an electron beam, self-consistent nonlinear simulations on the second harmonic complex cavity gyrotron operating at 0.42Â THz are presented. The influences of the electron beam parameters on the interaction efficiency are analyzed. The experimental results show that the designed complex cavity gyrotron is operationally stable at TE17.4 with pulse output power of 22.25Â kW when the beam current is 4.8 A, beam voltage is 45Â kV, and applied magnetic field is 8.185Â T. The corresponding frequency and interaction efficiency are 421.60Â GHz and 10.27%, respectively.
Keywords
Related Topics
Physical Sciences and Engineering
Materials Science
Surfaces, Coatings and Films
Authors
Tianzhong Zhang, Qixiang Zhao, Sheng Yu, Youwei Yang, Yanyan Zhang, Xiang Li,