北京大学高功率耦合器谐振环锻炼平台是对北京大学1.3 GHz超导加速器的耦合器进行高功率测试和锻炼的平台, 通过谐振环与信号源谐振来产生高功率。在谐振环工作过程中, 由于外界扰动会使其共振频率发生变化, 故需要对谐振环路进行频率锁定, 从而维持其与信号源的共振。将PDH（Pound-Drever-Hall）技术应用在此锻炼平台上, 用以锁定微波信号源与谐振环的频率。实验验证表明, 该PDH反馈系统能有效维持谐振环的高增益。

A radio-frequency (RF) resonant ring test bench has been developed at Peking University for testing and conditioning the power couplers of the 1.3 GHz superconducting radio-frequency accelerator. To maintain the resonant condition of the resonant ring under external disturbance, the Pound-Drever-Hall (PDH) technique has been adopted for frequency locking between the ring and the power source. This paper introduces the application of PDH technique in the RF resonant ring and presents the experiment results showing the effectiveness of the frequency locking against external disturbance.