介绍了HL-2A装置3.7GHz LHCD系统的功率测量方法.利用HFSS仿真发现,当定向耦合器隔离度>30dB时,可以有效地抑制反向微波相位对前向功率测量产生的影响.经过对系统改进,2016年实验中LHCD传输系统总体传输线效率可达到89％,最大传输功率达到1.5MW.%The power measurement method for 3.7GHz LHCD system on HL-2A was introduced. It is found by HFSS simulation that the impact of backward wave phase on the measurement of forward power may be suppressed if the isolation of directional coupler is more than 30dB. After improving the system, the total transmission line efficiency of the LHCD system can reach 89％ with maximum power 1.5MW in 2016 experiment campaign.
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