The study of tuning system for BEPC II

Tuning system plays a very important role when superconducting cavity works. It cooperates with other control loops, to adjust the frequency of cavity with high precision, reduce the reflection power, guarantee the stability of beam and ensure the safety of superconducting cavity. This paper focuses mainly on the tuning system working principle, the working state and problems that BEPC (Beijing Electron Positron Collider) II has encountered during operation.