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Report No.
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Data acquisition monitoring system with Manyo Library at MLF, J-PARC

Inamura, Yasuhiro  ; Ito, Takayoshi*; Suzuki, Jiro*

The on-line monitoring system, which executes data reduction and visualization in the middle of a measurement, is strongly required by users at MLF, J-PARC. To realize useful on-line monitoring, we have developed successfully the system to read and analyze only event data increased newly by our data acquisition system by means of repeated observations of data files. This system is achieved by two developments. One is a new component of DAQ-Middleware to make position indexes in data files at a same time as neutron event recoding in order to enable fast access to a part of event data files. Another is a new function in Manyo Library to make histogram by reading repeatedly incremental events using the index information of event data files. As results, a mount of events analyzed at a time is optimized and its process time including the visualization becomes short, which works like the on-line monitoring.

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