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利用压控振荡器锁相环路(VCO-PLL)锁定超导射频谐振腔体的本征频率,使腔体稳定谐振。在原理验证阶段,利用NI-Labview对实验原理做了仿真。得到的仿真结果显示,环路增益选取的不同会直接影响整个系统的锁定状态。在实验测试阶段,根据原理和仿真结果搭建了相应的实验平台,从而得到环路锁定的测试结果。最后在低温超导态测试阶段,用经过验证的实验平台对IMP-HWR010超导腔体进行了频率锁定测试,并得到了腔体频率随氦压变化的实际测量结果,df/dp约为0.73 Hz/Pa。
The VCO-PLL is used to lock the eigenfrequency of the superconducting RF resonant cavity to make the cavity resonate steadily. In the principle verification stage, the experimental principle is simulated by NI-Labview. The simulation results show that the difference between the loop gain selection will directly affect the entire system lock state. In the experimental test phase, the corresponding experimental platform is built according to the principle and the simulation results to obtain the test result of the loop lock. Finally, in the low-temperature superconducting state test stage, the frequency-locked test of the IMP-HWR010 superconducting cavity was carried out with a validated experimental platform and the actual measurement results of the cavity frequency changing with the helium pressure were obtained. The df / dp was about 0.73 Hz / Pa.