THE INSERTION DEVICE CONTROL IN BEPC

The insertion device in the Beijing Electron Positron Collider (BEPC) for synchrotron radiation X-ray beam lines consists of main coil and auxiliary coil that are respectively powered by two independent power supplies with high precision. The two power supplies called main power supply and auxiliary power supply are rebuilt with a new power supply interface (PSI). They are controlled by a power supply controller (PSC). This system is completed within one month after the control prototype for BEPCII magnet power supplies with PSC/PSI was finished. During commissioning, it is modified many times to meet its operational requirements. It has been running for about six months without any big problems enabling synchrotron radiation research on the two x-ray beam lines. This paper describes a new control system based on EPICS for the insertion device power supplies. The requirements to its ramp and its programming are also discussed.