The design of a multi-harmonic step-tunable gyrotron

doi:10.1063/1.4977452

CORC > 北京大学 > 信息科学技术学院

	The design of a multi-harmonic step-tunable gyrotron
	Qi, Xiang-Bo ; Du, Chao-Hai ; Zhu, Juan-Feng ; Pan, Shi ; Liu, Pu-Kun
刊名	PHYSICS OF PLASMAS
	2017
关键词	CYCLOTRON HARMONIC GYROTRON HIGH-POWER TERAHERTZ GYROTRON OUTPUT WINDOW PULSE MAGNET THZ GYROTRON FREQUENCY OPERATION ECRH OSCILLATOR
DOI	10.1063/1.4977452
英文摘要	The theoretical study of a step-tunable gyrotron controlled by successive excitation of multiharmonic modes is presented in this paper. An axis-encircling electron beam is employed to eliminate the harmonic mode competition. Physics images are depicted to elaborate the multi-harmonic interaction mechanism in determining the operating parameters at which arbitrary harmonic tuning can be realized by magnetic field sweeping to achieve controlled multiband frequencies' radiation. An important principle is revealed that a weak coupling coefficient under a high-harmonic interaction can be compensated by a high Q-factor. To some extent, the complementation between the high Q-factor and weak coupling coefficient makes the high-harmonic mode potential to achieve high efficiency. Based on a previous optimized magnetic cusp gun, the multiharmonic step-tunable gyrotron is feasible by using harmonic tuning of first-to-fourth harmonic modes. Multimode simulation shows that the multi-harmonic gyrotron can operate on the 34 GHz first-harmonic TE11 mode, 54 GHz second-harmonic TE21 mode, 74 GHz third-harmonic TE31 mode, and 94 GHz fourth-harmonic TE41 mode, corresponding to peak efficiencies of 28.6%, 35.7%, 17.1%, and 11.4%, respectively. The multi-harmonic step-tunable gyrotron provides new possibilities in millimeter-terahertz source development especially for advanced terahertz applications. Published by AIP Publishing.; National Natural Science Foundation of China [61531002, 61522101, 61471007]; Beijing NOVA program [Z161100004916057]; Opening Project of Wuhan National High Magnetic Field Center (HUST) [2015KF13]; SCI(E); ARTICLE; 3; 24
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/474801]
专题	信息科学技术学院
推荐引用方式 GB/T 7714	Qi, Xiang-Bo,Du, Chao-Hai,Zhu, Juan-Feng,et al. The design of a multi-harmonic step-tunable gyrotron[J]. PHYSICS OF PLASMAS,2017.
APA	Qi, Xiang-Bo,Du, Chao-Hai,Zhu, Juan-Feng,Pan, Shi,&Liu, Pu-Kun.(2017).The design of a multi-harmonic step-tunable gyrotron.PHYSICS OF PLASMAS.
MLA	Qi, Xiang-Bo,et al."The design of a multi-harmonic step-tunable gyrotron".PHYSICS OF PLASMAS (2017).