, and K. Watanabe

LINAC and the Rapid Cycling Synchrotron (RCS) in the J-PARC accelerator complex consist of a huge number of accelerator machine components. They produce extreme high power beam of 1 MW. To minimize radiation due to beam loss, systematic control of machine parameters of components as the single accelerator system is required. RCS is further complex system where each beam pulse of 25 Hz is injected either into the Material and Life Science Facility (MLF) or into the 50 GeV Main Ring (MR). In order to store these complex control parameters as the only data source shared by the whole control system and accelerator components, a relational database (RDB) system has been developed. The RDB system consists of three kinds of RDB; a machine database which records static machine parameters, a data acquisition database which records data taken with the data acquisition system, and an operation log database which records history of operation parameters. The machine database stores static machine information about control system of each accelerator component. One of the main goals of the database is to generate EPICS configuration files automatically. A JAVA code has been developed and tested successfully. The machine database also stores geometry information and conversion parameters between device parameters and physics parameters. The overall RDB system is designed to have close connection to the high level accelerator operation applications and online simulators. The high level application can save and restore operation parameters with the operation log database. The same set of parameters is used to generate simulation input files together with the geometry data from the machine database. The generator code in JAVA has been developed for XAL and Trace3D, and SAD simulation codes. The code utilizes XAL framework [5] developed in SNS. By conversion between device and machine parameters from the machine database, the high level application can directly compare operation parameters of the machines with simulations. The design and the current status of the RDB system are discussed