CONTROL OF THE LOW LEVEL RF SYSTEM FOR THE J-PARC LINAC

The J-PARC 181-Mev proton linac requires twentyfour RF systems, which operate at a 620-µs pulse width, 50-Hz repetition rate, and 324-MHz frequency. The required basic functions of the low level RF (LLRF) control system for the klystron RF source are: field control, high-power protection, analog and status monitor and klystron drive. To perform these functions a programmable logic controller (PLC) is used as the main system controller. The PLC will be locally operated by a touch panel on PLC LAN and remotely by an EPICS Operator Interface (OPI) on EPICS LAN. This paper describes the LLRF hardware configurations and the system control using the PLC.