Development of EPICS-based software of triggered scaler

A 'triggered scaler' has been developed for J-PARC accelerators. It is a scaler to count pulsed signals, which are provided for accelerator components. It stores counts in a memory array, and each external trigger (typically 25Hz, from J-PARC Timing System) shifts the pointer to the array during a machine cycle (2.48s or 5.20s). Then, stored data (waveform-type EPICS record) is expected to verify no miss-trigger (or, to find a miss-trigger) in the previous machine cycle. In order to realize such functionalities, we have made basic design of database definitions (EPICS db) for triggered scaler. Three-layered design has been discussed. Development status of EPICS db, early experiences with real MR signals, are reported. (author)