Tuner control system of spoke012 SRF cavity for C-ADS injector I at IHEP
  A new tuner control system of spoke superconducting radio frequency (SRF) cavity has been developed and applied to cryomodule I (CM1) of C-ADS injector I at IHEP. We have successfully implemented the tuner controllerfor the first time and achieved a cavity tuning phase error of 0.7degrees (about 4 Hz peak to peak) in the presence of electromechanical coupled resonance. This paper will present the preliminary experimental results based on the new tuner controller under proton beam commissioning. 
Na Liu, Yi Sun, Guang-Wei Wang, Zheng-Hui Mi, Hai-Ying Lin, Qun-Yao   Wang, Rong Liu, Xin-Peng Ma
physics.acc-ph cs.SY hep-ex