Control System of 3 GeV Rapid Cycling Synchrotron at J-PARC

Since the 3GeV Rapid Cycling Synchrotron (RCS) produces huge beam power of 1 MW, extreme cares must be taken to design the control system in order to minimize radiation due to beam loss. Another complexity appears in the control system, because each beam bunch of 25 Hz is required to be injected either into the Material and Life Science Facility (MLF) or into the 50GeV Main Ring (MR). Therefore, each bunch of 25 Hz must be operated with different parameters, and the data acquisition system also must collect synchronized data within each pulse. To achieve these goals, a control system via reflective memory and wave endless recorders have been developed. EPICS is adopted in the control system. Since the number of devices is huge, the management of EPICS records and their configurations need huge amount of time and man power. To reduce this work significantly, a Relational Data Base (RDB) for static machine information has been developed. This RDB stores (1) EPICS related information of devices, interfaces, and Input Output Controller (IOC) with a capability to generate EPICS records automatically, and (2) geometrical information of components with a capability to generate lattice files for various simulation codes. The status of the RCS control system focusing on the data acquisition system and the RDB will be presented.