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强流离子源是EAST(Experimental Advanced Superconducting Tokamak)中性束注入器(Neutral Beam Injector,NBI)最关键的核心部件,其能达到的性能在很大程度上决定了EAST中性束注入器所能达到的指标。离子源在束引出时电极打火现象偶有发生,这对于离子源的正常运行有非常严重的影响,甚至危害离子源的寿命。本文结合离子源运行过程中的束引出实验波形和水流量热计(Water Flow Calorimetry,WFC)系统的测量数据得出等离子体发射面的束流光学系统一直处于非最佳聚焦状态是导致打火的原因,试通过优化高压投入时刻等离子体与高压的匹配,实现高压的稳定投入有效抑制打火现象的发生,并且给离子源加入硬件保护机制,为离子源安全稳定运行奠定基础。
The strong stream ion source is the most critical core component of the Experimental Neutral Beam Injector (EAST) (Neutral Beam Injector), and the performance it achieves largely determines the EAST Neutral Beam Injector Reached indicators. Occurrence of the electrode ignition phenomenon occurs occasionally when the ion beam is led out, which has a very serious impact on the normal operation of the ion source, and even endanger the life of the ion source. In this paper, the measurement data of the beam extraction experiment waveform and the Water Flow Calorimetry (WFC) system in the process of ion source operation are obtained. It is concluded that the beam emission optical system of the plasma emission surface has been in the non-optimal focus state for a long time, The reason is that by optimizing the match between the plasma and the high pressure at the time of the high voltage input, the realization of the stable input of the high voltage can effectively suppress the occurrence of the ignition phenomenon, and the hardware protection mechanism is added to the ion source to lay a foundation for the safe and stable operation of the ion source.