| |
- M. Ishii, M. Kago
JASRI/SPring-8, Hyogo-ken, Japan
- T. Fukui
RIKEN SPring-8 Center, Innovative Light Sources Division, Hyogo, Japan
- T. Maruyama
RIKEN/SPring-8, Hyogo, Japan
- T. Ohshima
RIKEN SPring-8 Center, Sayo-cho, Sayo-gun, Hyogo, Japan
- M. Yoshioka
SES, Hyogo-pref., Japan
|
|
| |
At SACLA, an event-synchronized data acquisition system had been installed. The system collects shot-by-shot data, such as representative point data of the phase and amplitude of the rf cavity pickup signals, in synchronization with the beam operation cycle. In addition, rf waveform data is collected every 10 minutes. However a collection with several minutes cycle couldn’t catch an abnormal rf waveform that suddenly occurs. To overcome this problem, we have developed a system to capture waveform when some abnormal event occurs. The system consists of the VMEbus systems, a DAQ server, and a NoSQL database system, Cassandra. The VMEbus system detects an abnormal rf waveform, collects all related waveforms with same shot and sends to a DAQ server. All waveforms are stored Cassandra via the DAQ server. The DAQ server keeps data for 2 seconds from current time on memory to complement Cassandra’s eventual consistency model. We constructed a prototype DAQ system with a minimum configuration and checked its performance. We report the requirements and structure of the DAQ system and the test results in this paper.
|
|
