HL-2A装置NBI离子源抑制极电源的实验分析

Study on suppressor gird power supply of NBI ion source on HL-2A tokamak

为提高NBI系统的稳定运行参数和可靠性,研制了一台基于高频开关电源技术的全固态调制输出负高压测试电源,并将HL-2A装置NBI系统原4套抑制极电源的电子管调制器改为基于IGBT串联技术的全固态调制器。对比原抑制极电源系统,给出了基于高频开关技术和IGBT串联技术的抑制极电源结构。结合NBI系统调试实验,通过调节抑制极电源电压,瞬态电流输出能力,分析了抑制极电源输出性能对离子源束流引出特性,离子源引出电极击穿特性的影响,获得了引出稳定离子束流的最低抑制电压。

In order to improve the parameter and system stability, a testing suppressor grid power supply was developed based on high-frequency switching power supply technology and IGBT stacks in series technology, and all the former tetrode modulators with solid-state modulators based on IGBT stacks in series were replaced. The structure of this newly developed power supply was introduced firstly, and the operation performance of power supplies for ion source and its relationship with extraction of ion source was analyzed based on practical data of NBI debugging experiment, and the minimum voltage of suppressor grid power supply for extraction was achieved as well.