Event recording data acquisition system and experiment data management system for neutron experiments at MLF, J-PARC

Nakatani, Takeshi ; Inamura, Yasuhiro  ; Moriyama, Kentaro; Ito, Takayoshi*; Muto, Suguru*; Otomo, Toshiya*

In MLF, J-PARC 18 neutron experimental instruments have already been under operation and various measurements are carried out by many users. These instruments are composed of neutron detectors, sample environment and neutron optics devices. The signals from these components and the neutron source are transformed into the digital signals by the DAQ electronics and recorded as the event data with the time in the DAQ computers by "DAQ Middleware". The DAQ system produces the enormous measurement event data (GB) under various measurement conditions. Simultaneously, the measurement meta-data indicating each measurement condition is recorded in XML format by the MLF control software framework "IROHA". These measurement event data and meta-data are collected in the MLF common storage and cataloged by the MLF Experimental Database based on the commercial XML database. The database system provides the web interface for the experiment data management and the remote data analysis for users.