HL-2M初始放电位形及波形设计

Design of the configuration and waveform for HL-2M initial discharge

利用EFIT设计了可用于HL-2M初始放电的圆截面限制器位形以及偏滤器位形;设计了满足放电击穿条件要求(零场区域平均杂散磁场应不超过20G)的零场位形。综合分析放电过程伏秒数消耗及真空室涡流的影响,使用PF8线圈电流补偿真空室涡流产生的杂散磁场,设计了等离子体电流200kA的限制器位形及偏滤器位形的自洽的放电波形。将该放电波形作为放电调试的参考波形,成功实现了限制器位形的初始放电实验。

The circular cross-section limiter configuration and divertor configuration that can be used for the initial discharge of HL-2 M tokamak are designed with EFIT. The designed field null configuration meets the requirements of discharge breakdown conditions, that is, the average stray magnetic field in the field null area does not exceed 20 Gauss. By evaluating the discharge volt-second consumption, and using the PF8 coil current to compensate the stray magnetic field generated by the eddy current of the vacuum vessel, the self-consistent discharge waveforms with the plasma current of 200 kA for the limiter configuration and the divertor configuration are designed respectively. The discharge waveform was used as the feed-forward waveform for HL-2 M discharge debugging, and the first plasma experiment with the limiter configuration was successfully achieved.