  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.
