Development of machine protection system for SRILAC

The RIKEN linear accelerator (RILAC) is implemented as one of the injectors of RIBF at RIKEN Nishina Center. A superconducting RILAC (SRILAC) has been installed to search for superheavy elements of 119 and higher. In the past, the machine protection system for RILAC was constructed by a combination of simple relay circuits. On the other hand, most of the other parts of the RIBF have been equipped with machine protection systems using MELSEC-Q series since 2006. Since the beam intensity has been increased and to prevent breakdown of the superconducting cavity due to beam orbit changes by such as a trouble of power supplies, the SRILAC project requires enhanced machine protection system. For this reason, we have realized the BIS with higher response performance than the conventional system by using the FA-M3 base. Additionally, FPGA modules have been introduced to achieve response performance faster than 1 msec in FA-M3 based system. The BIS for SRILAC has been implemented and the beam commissioning has been successfully completed in 2020. (author)