C波段连续波大功率水负载设计

The Design of C-Band Continuous Wave High Power Water Load

为满足EAST托卡马克装置低杂波电流驱动系统的大功率速调管和微波器件测试需求,设计了一种新型C波段连续波大功率水负载,该负载采用氧化铍陶瓷片隔开去离子水,再由后者吸收微波功率。低功率测试结果显示,在(4 600±50)MHz带宽范围内,电压驻波比小于1.1,并通过250 k W/1 600 s高功率测试,反射功率小于1.0 k W,当水流量为203.3 L/min时,在250 k W功率水平,进出口水的温差约为17.6℃。

To test high power klystrons and microwave components used in Lower Hybrid Current Drive（LHCD） system for EAST tokamak,a new kind of C-band continuous wave high power water load has been designed,deionized water sealed with beryllia ceramic is used as the microwave absorbent. Low power test results show that,in the（4 600 ± 50） MHz frequency range,the Voltage Standing Wave Ratio（VSWR） is below 1. 1,high power test resulted in 250 k W being absorbed for 1 600 s with less than1. 0 k W power reflection,the water temperature difference between inlet and outlet is about 17. 6 ℃ at250 k W power level,while the water flow rate is 203. 3 L/min.