Forward-wave enhanced radiation in the terahertz electron cyclotron maser  

作　　者：Zi-Chao Gao Chao-Hai Du Fan-Hong Li Zi-Wen Zhang Si-Qi Li Pu-Kun Liu 高子超;杜朝海;李繁弘;张子文;李思琦;刘濮鲲(School of Electronics,Peking University,Beijing 100871,China)

机构地区：[1]School of Electronics,Peking University,Beijing 100871,China

出　　处：《Chinese Physics B》2022年第12期643-649,共7页中国物理B（英文版）

基　　金：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);Newton Advanced Fellowship from Royal Society in the United Kingdom(Grant No.NAF/R1/180121)

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 

分 类 号：O441.4[理学—电磁学]