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TY - CONF AU - Ishii, M. AU - Fukui, T. AU - Hasegawa, T. AU - Inagaki, T. AU - Kago, M. AU - Maesaka, H. AU - Maruyama, T. AU - Ohshima, T. AU - Otake, Y. AU - Yoshioka, M. ED - Corvetti, Lou ED - Riches, Kathleen ED - Schaa, Volker RW TI - A Data Acquisition System for Abnormal RF Waveform at SACLA J2 - Proc. of ICALEPCS2015, Melbourne, Australia, 17-23 October 2015 C1 - Melbourne, Australia T2 - International Conference on Accelerator and Large Experimental Physics Control Systems T3 - 15 LA - english AB - At the X-ray Free Electron Laser (XFEL) facility, SACLA, an event-synchronized data acquisition system has been utilized for the XFEL operation. This system collects every shot-by-shot data, such as point data of the phase and amplitude of the RF cavity pickup signals, in synchronization with the beam operation cycle. This system also acquires RF waveform data every 10 minutes. In addition to the periodic waveform acquisition, an abnormal RF waveform that suddenly occurs should be collected for failure diagnostics. Therefore, we developed an abnormal RF waveform data acquisition (DAQ) system, which consists of the VME systems, a cache server, and a NoSQL database system, Apache Cassandra. When the VME system detects an abnormal RF waveform, it collects all related waveforms of the same shot. The waveforms are stored in Cassandra through the cache server. Before the installation to SACLA, we ensured the performance with a prototype system. In 2014, we installed the DAQ system into the injection part with five VME systems. In 2015, we will acquire waveforms from the low-level RF control system configured by 74 VME systems at the SACLA accelerator. PB - JACoW CP - Geneva, Switzerland SP - 721 EP - 724 KW - GUI KW - LLRF KW - data-acquisition KW - cavity KW - controls DA - 2015/12 PY - 2015 SN - 978-3-95450-148-9 DO - 10.18429/JACoW-ICALEPCS2015-WEPGF014 UR - http://jacow.org/icalepcs2015/papers/wepgf014.pdf ER -