A prototype ion cyclotron range of frequency (ICRF) antenna with RF power of 6 MW has been developed for the long pulse (300 s), high power operation in the Korea superconducting tokamak advanced research (KSTAR) tokamak. Cooling paths in the antenna were carefully designed to remove the dissipated RF power loss. An RF power test has been performed to estimate the standoff capability of the antenna. A high power RF test at a frequency of 30 MHz gives a standoff voltage of 30.5 kVp for 60 s and 23.2 kVp for 300 s (without cooling). During the RF pulse, the peak voltage, forward/reflected powers, temperature of the antenna, and gas pressure are measured. A vacuum feedthrough of 1 MW RF power has been developed, which has two alumina ceramic cylinders and an O-ring seal. For cooling of the ceramic parts, dry air is injected into the ceramic surface through two outer nozzles. Independent cooling water channels are installed to cool the inner conductor of the feedthrough. RF high voltage tests show that stable operation is possible, with a peak voltage of 28.9 kVp for 300 s, without any severe damage.
原型离子回旋频率范围（ICRF）天线已开发用于韩国超导托卡马克先进研究（KSTAR）装置中的长脉冲（300秒）、高功率运行，其射频功率为6兆瓦。天线中的冷却路径经过精心设计，以耗散射频功率损耗。为评估天线的耐压能力，进行了射频功率测试。在30兆赫频率下的高功率射频测试中，60秒内获得30.5千伏峰值耐压，300秒内（无冷却）获得23.2千伏峰值耐压。在射频脉冲期间，测量了峰值电压、正向/反射功率、天线温度及气体压力。已开发出额定射频功率为1兆瓦的真空馈通，其采用两个氧化铝陶瓷圆柱体和一个O形圈密封。为冷却陶瓷部件，通过两个外部喷嘴向陶瓷表面注入干燥空气。馈通内部导体则通过独立的冷却水通道进行冷却。射频高压测试表明，在28.9千伏峰值电压下可持续稳定运行300秒，且无任何严重损坏。