Design and stability analysis of tuning system for new beam buncher B1 at HIRFL

In order to synchronize the extracted ion beam from the Sector Focusing Cyclotron (SFC) with the accelerating RF phase of the Separated Sector Cyclotron (SSC), a new beam buncher is designed in IMP. This paper is mainly devoted to a automatic frequency tuning system which is one of the most important parts of the buncher. The system has been put into operation and it is possible to stabilize the inherent resonant frequency of the cavity on the frequency of input signal (22~54 MHz), consequently avoid the voltage drop down and get higher RF voltage on the accelerated gap in cavity. The safe and effective operation of the beam buncher is ensured.