Abstract: The method of ameliorating the plasma current quench in major disruptions using laser ablation of high Z impurity is described and the preliminary results on HL-1M and HL-2A tokamak are presented. The experimental results show that a resistive, highly radiating plasma can be formed prior to the thermal quench due to the rapidly-increased radiation caused by the high-impurity, both the thermal and magnetic energy are dissipated significantly and thereby the major disruption can be mitigated.

Key words: High Z impurity, Disruption, Plasma termination, Laser ablation

摘要： HL-2A和HL-1M装置采用了激光吹气注入高Z杂质来缓减大破裂中的等离子体电流衰竭，并给出了初步实验结果。在HL-2A装置上建立了利用MHD扰动的参量预报放电破裂先兆的报警系统，研制了MHD实时检测与处理系统，实现了放电破裂先兆的预报、快速触发激光吹气、形成阻性高辐射等离子体、消耗热能和磁能，缓减大破裂。实验证明，这是一种使得大型聚变实验装置在放电破裂之前显著减少等离子体中热能和磁能，而且能安全终止放电的简单、快速和有效的途径。

关键词: 高Z杂质, 破裂, 等离子体终止, 激光吹气