Forward-wave enhanced radiation in the terahertz electron cyclotron maser

doi:10.1088/1674-1056/ac90b4

Abstract Based on the principle of electron cyclotron maser (ECM), gyrotrons are among the most promising devices to generate powerful coherent terahertz (THz) radiation and play a vital role in numerous advanced THz applications. Unfortunately, THz ECM systems using a conventional high-Q cavity were theoretically and experimentally demonstrated to suffer from strong ohmic losses, and, accordingly, the wave output efficiency was significantly reduced. A scheme to alleviate such a challenging problem is systematically investigated in this paper. The traveling-wave operation concept is employed in a 1-THz third harmonic gyrotron oscillator, which strengthens electron-wave interaction efficiency and reduces the ohmic dissipation, simultaneously. A lossy belt is added in the interaction circuit to stably constitute the traveling-wave interaction, and a down-tapered magnetic field is employed to further amplify the forward-wave (FW) component. The results demonstrate that the proportion of ohmic losses is nearly halved, and output efficiency is nearly doubled, which is promising for further advancement of high-power continuous-wave operation of the ECM-based devices.

Keywords: electron cyclotron maser ohmic loss harmonic operation traveling wave interaction

Received: 24 June 2022
Revised: 31 July 2022
Accepted manuscript online: 09 September 2022

PACS:

84.40.Ik

(Masers; gyrotrons (cyclotron-resonance masers))

Fund: This work was supported in part by Beijing Science Foundation for Distinguished Young Scholars (Grant No. JQ21011), the National Natural Science Foundation of China (Grant Nos. U1830201 and 61531002), and Newton Advanced Fellowship from Royal Society in the United Kingdom (Grant No. NAF/R1/180121).

Corresponding Authors: Chao-Hai Du, Pu-Kun Liu
E-mail: duchaohai@pku.edu.cn;pkliu@pku.edu.cn

Cite this article:

Zi-Chao Gao(高子超), Chao-Hai Du(杜朝海), Fan-Hong Li(李繁弘), Zi-Wen Zhang(张子文), Si-Qi Li(李思琦), and Pu-Kun Liu(刘濮鲲) Forward-wave enhanced radiation in the terahertz electron cyclotron maser 2022 Chin. Phys. B 31 128401

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