In this study, a 5.8 MW high voltage power supply was developed for two 1.2 MW klystrons to operate the upgraded KSTAR helicon current drive system. The developed power supply was configured to connect 180 pulse step modulator (PSM) modules using semiconductor switches connected in series to produce an output with a rating of −92 kV and 64 A for 300 s. To operate the klystron individually, the output of the cathode power supply (CPS) is divided into two high voltage switches (HVSs). The HVS not only operates as an individual switching, but also cuts off the energy from being transferred to the load within 5 μs in case of an arc or short circuit. At this time, the energy should be 5 J or less. The individual PSM of the power supply is controlled by optic shifting distributor controller, and the overall control and protection are controlled by the CPS controller. Currently, this power supply is installed at KSTAR, and has been tested up to the maximum voltage of −92 kV for performance verification. In addition, the arc energy blocking performance was verified through the wire burning test of HVS. Furthermore, an actual load test was conducted on one klystron installed for operation; an RF test was conducted up to −70 kV, and the maximum output was measured up to 620 kW

在这项研究中，为两个 1.2 MW 速调管开发了一个 5.8 MW 高压电源，以运行升级后的 KSTAR 螺旋电流驱动系统。开发的电源配置为使用串联的半导体开关连接 180 个脉冲步进调制器 (PSM) 模块，以产生额定值为 -92 k​​V 和 64 A 的输出，持续 300 秒。为了单独操作速调管，阴极电源 (CPS) 的输出分为两个高压开关 (HVS)。HVS 不仅作为单独的开关运行，而且在电弧或短路的情况下，在 5 μs 内切断能量传输到负载。此时，能量应为 5 J 或更小。电源的单独PSM由光移分配器控制器控制，整体控制和保护由CPS控制器控制。目前，该电源已安装在科思达，并已通过最高-92 k​​V的电压测试进行性能验证。此外，通过HVS的焊丝燃烧试验验证了电弧能量阻断性能。此外，还对一个安装运行的速调管进行了实际负载测试；射频测试进行了高达 -70 kV 的测试，测量的最大输出高达 620 kW