Recent development of a monitoring system for beam line status at the J-PARC slow-extraction beam line

The 50-GeV proton synchrotron of J-PARC (Japan Proton Accelerator Research Complex) [1] now under construction aims to provide a high intensity proton beam (50 GeV, 15 oA) to various nuclear and particle physics experiments. For stable operation of the beam, it is necessary to monitor temperature, vacuum, and differential pressure from the gauges that are attached on apparatus at large beam loss points. It is also required to archive the data of the status of beam line and those apparatus to be able to get historical information and investigate cause of a beam failure. As part of the R&D program to construct such control system, we have recently developed a data logger with the EPICS [2] channel archiver [3] and online GUI display programmed in Python with the XMLRPC and the Tk interface. The performance and evaluation of this system are reported.