作者机构：
[Chen Wenguang] Univ S China, Sch Elect Engn, Hengyang 421001, Peoples R China.;[HL-2A NBI Grp; Chen Wenguang; Kang Zihua; Rao Jun; Cao Jianyong; Wang Mingwei; Feng Kun; Lei Guangjiu; Li Bo] SW Inst Phys, Chengdu 610041, Peoples R China.
通讯机构：
[Chen Wenguang] U;Univ S China, Sch Elect Engn, Hengyang 421001, Peoples R China.
关键词：
HL-2A;neutral beam injector;neutral beam injection power supply;control sequence
摘要：
Neutral beam injection (NBI) is one of the most effective ways to heat and drive plasma in a tokamak. The mega watt level neutral beam injector on the HL-2A tokamak consists of four high-power ion sources. Each source is supplied by discharge, beam extraction and auxiliary power supplies. Some circuit topologies and control sequences designed for the system are presented in this paper. Some important technologies such as the notching circuit, insulated gate bipolar transistor (IGBT) series-connected switch, high-frequency switching power supply and control system based on a digital signal processor (DSP) have been used. The system can be effectively used for high current ion beam extraction, protection, ion optics and so on. The power system has been safely used in HL-2A high-parameter NBI experiments for three years. The power of NBI can be kept at higher than 0.75 MW for 1 second and the ion beam power extracted from the ion source is higher than 2 MW. The ion temperature of the plasma center is close to 2.0 keV. These results show that the design of this power system is reasonable and reliable, and it can fully meet the system requirements for NBI of the HL-2A tokamak.
作者机构：
[盛义发; 桂卫华; 喻寿益] School of Information Science and Engineering, Central South University, Changsha 410083, China;[周文振; 刘升学; 盛义发] School of Electrical Engineering, University of South China, Hengyang 421001, China
通讯机构：
School of Information Science and Engineering, Central South University, China
作者机构：
[詹杰; 王彦; 刘宏立] College of Electrical and Information Engineering, Hunan University, Changsha 410082, China;[王彦] College of Electrical Engineering, Nanhua University, Hengyang 421001, China
通讯机构：
College of Electrical and Information Engineering, Hunan University, China
作者机构：
[李盛伟; 孙景钌; 金强; 李永丽; 李旭光] Key Laboratory of Smart Grid of Ministry of Education, Tianjin University, Tianjin 300072, China;[邓哲] School of Electric Engineering, University of South China, Hengyang 421001, China;[李盛伟] Tianjin Electric Power Corporation Technical Center, Tianjin 300384, China
通讯机构：
Key Laboratory of Smart Grid of Ministry of Education, Tianjin University, China
作者机构：
[陈文光] School of Electrical Engineering, University of South China, Hengyang 421001, China;[陈文光; 李波; 饶军; 王明伟; 雷光玖] Southwestern Institute of Physics, Chengdu 610041, China
通讯机构：
[Chen, W.-G.] S;School of Electrical Engineering, University of South China, China
作者机构：
[蒋陆萍; Zeng, Xiangjun; 李泽文] School of Electrical and Information Engineering, Changsha University of Science and Technology, Changsha 410076, Hunan Province, China;[彭安安] School of Electrical Engineering, Nanhua University, Hengyang 421001, Hunan Province, China
通讯机构：
School of Electrical and Information Engineering, Changsha University of Science and Technology, China
作者机构：
[徐伟东] Institute of Electrical Engineering, Chinese Acad. of Sci., Beijing 100190, China;[姚列英; 王英翘; 徐伟东; 宣伟民; 陈文光] Southwest Institute of Physics, Chengdu 610041, China;[陈文光] University of South China, Hengyang 421001, China
通讯机构：
[Xu, W.] I;Institute of Electrical Engineering, Chinese Acad. of Sci., China
作者机构：
[刘宏立; 王彦] College of Electrical and Information Engineering, Hunan Univ., Changsha, Hunan 410082, China;[杨珂; 王彦] College of Electrical Engineering, Nanhua Univ., Hengyang, Hunan 421001, China
通讯机构：
College of Electrical and Information Engineering, Hunan Univ., China
