Forward-wave enhanced radiation in the terahertz electron cyclotron maser

doi:10.1088/1674-1056/ac90b4

中国物理B ›› 2022, Vol. 31 ›› Issue (12): 128401-128401.doi: 10.1088/1674-1056/ac90b4

Forward-wave enhanced radiation in the terahertz electron cyclotron maser

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)^‡

School of Electronics, Peking University, Beijing 100871, China

收稿日期:2022-06-24 修回日期:2022-07-31 接受日期:2022-09-09 出版日期:2022-11-11 发布日期:2022-11-11
通讯作者: Chao-Hai Du, Pu-Kun Liu E-mail:duchaohai@pku.edu.cn;pkliu@pku.edu.cn
基金资助:
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).

Forward-wave enhanced radiation in the terahertz electron cyclotron maser

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)^‡

School of Electronics, Peking University, Beijing 100871, China

Received:2022-06-24 Revised:2022-07-31 Accepted:2022-09-09 Online:2022-11-11 Published:2022-11-11
Contact: Chao-Hai Du, Pu-Kun Liu E-mail:duchaohai@pku.edu.cn;pkliu@pku.edu.cn
Supported by:
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).

摘要/Abstract

摘要： 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.

关键词: electron cyclotron maser, ohmic loss, harmonic operation, traveling wave interaction

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.

Key words: electron cyclotron maser, ohmic loss, harmonic operation, traveling wave interaction

中图分类号: (Masers; gyrotrons (cyclotron-resonance masers))

84.40.Ik

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[J]. 中国物理B, 2022, 31(12): 128401-128401.

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Forward-wave enhanced radiation in the terahertz electron cyclotron maser

Forward-wave enhanced radiation in the terahertz electron cyclotron maser

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