HL-2M装置5 MW中性束加热束线离子源放电室研制  

Development of ion source discharge chamber for the 5 MW neutral beam heating line on HL-2M device

作　　者：魏会领[1] 曹建勇[1] 余珮炫 邹桂清[1] 周红霞[1] 杨宪福 周博文[1] 罗怀宇 耿少飞[1] Wei Huiling;Cao Jianyong;Yu Peixuan;Zou Guiqing;Zhou Hongxia;Yang Xianfu;Zhou Bowen;Luo Huaiyu;Geng Shaofei(Southwestern Institute of Physics,Chengdu 610225,China)

机构地区：[1]核工业西南物理研究院

出　　处：《强激光与粒子束》2020年第4期123-127,共5页High Power Laser and Particle Beams

基　　金：国家自然科学基金项目(11405048);国际热核聚变实验堆计划专项(2011GB103000)

摘　　要：为了给HL-2M装置建设一条5 MW中性束加热束线,开展了中性束加热用热阴极弧放电离子源放电室的研制。这条中性束束线包含4套80 kV/45 A/5 s离子源,放电室的设计指标为850 A/5 s。首先采用CST软件中的电磁工作室对特定几何结构的放电室会切磁场进行了模拟计算,得到了会切磁场分布,验证了会切磁场布局的合理性。针对放电室加工工艺和实验过程中局部拉弧等问题,对放电室结构进行了不断改进。放电室侧壁由40列会切磁体改为7圈环形磁体,阴极灯丝结构从灯丝板结构最终改为陶瓷可伐结构,并且在放电室和加速器之间增加了陶瓷屏蔽。在阴极板结构放电室和阴极陶瓷可伐结构放电室内都获得了正常的弧放电。最终定型的放电室采用周边7圈环形会切磁体和陶瓷可伐结构。在定型的放电室内达到了5 MW中性束束线离子源弧放电的指标。弧放电时间接近5 s,最大弧放电电流达到1 000 A。To construct a 5 MW neutral beam heating beamline for HL-2 M device, the development of the discharge chamber of the hot cathode arc discharge ion source for neutral beam heating was carried out. The neutral beamline contains four sets of 80 kV/45 A/5 s ion sources, and the discharge chamber design index is 850 A/5 s.Firstly, the electromagnetic studio in CST software was used to simulate the cusp magnetic field of the discharge chamber with specific geometric structure, and the cusp magnetic field distribution was obtained, which verified the rationality of cusp magnetic field layout. To solve the problems in the process of the discharge chamber and the localized arcing in the experiment, the structure of the discharge chamber was improved. The side wall of the discharge chamber changed from 40 rows of cusp magnets to 7 rings of cusp magnets, the cathode structure changed from the filament plate structure to the ceramic kovar structure, and a ceramic shield was added between the discharge chamber and the accelerator. Normal arc discharge was obtained in both the cathode plate discharge chamber and the cathode ceramic kovar discharge chamber. The final shaped discharge chamber adopted 7-ring cusp magnets and ceramic kovar cathode structure. The arc discharge index of the 5 MW neutral beamline ion source was achieved in the final shaped discharge chamber. The arc discharge time was close to 5 s, and the maximum arc discharge current reached 1 000 A.

关 键 词：HL-2M装置 中性束加热 离子源 弧放电室 

分 类 号：O532.26[理学—等离子体物理] O562.4[理学—物理]