ECRH Launcher for Four-Beam Injection on HL-2A Tokamak

• Published in: Plasma science & technology Vol. 15; no. 5; pp. 476 - 479
• Main Author: 王超 周俊 黄梅 王贺 陈罡宇 饶军
• Format: Journal Article
• Language: English
• Published: 01.05.2013
• Subjects: Beams (radiation); Cross sections; Deposition; ECRH; Gyrotrons; HL-2A装置; Launchers; Mathematical models; Three dimensional models; Tokamak devices; Tubes; 加热实验; 发射器; 托卡马克; 最大输出功率; 激光等离子体; 电子回旋共振加热系统
• ISSN: 1009-0630
• DOI: 10.1088/1009-0630/15/5/16

An Electron Cyclotron Resonance Heating （ECRH） launcher for four-beam injection has been installed on the HL-2A tokamak and used in plasma heating experiments. By the launcher, four EC wave beams can be injected into the tokamak through a φ350 mm port, which are generated from 2 sets of 68 GHz/1 s and 2 sets of 68 GHz/1.5 s gyrotron tubes manufactured by GYCOM, with maximum output power of 500 kW for each. In this paper, the properties of the EC beam in the launcher and plasma are presented： at the centre of the cross section of the tokamak, the beam radius is 31.7 mm; thermal analysis of a 3D model indicates that the peak temperature increase would be only 30 o C at the mirror surface for a 500 kW/1 s pulse; ray-tracing calculation predicts satisfactory power deposition. In the plasma experiment, six beams including four beams from this launcher and two from another launcher have been injected simultaneously. Besides, obtaining ELM-y H-mode discharges, the ECRH system shows reliability and stability of the launcher functions.