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The T2K near detector data acquisition systems

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7 Author(s)
M. Thorpe ; STFC Rutherford Appleton Laboratory, Harwell Science & Innovation Campus, Didcot, Oxon, OX11 0QX, U.K. ; C. Angelsen ; G. Barr ; C. Metelko
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T2K is a second generation long-baseline experiment in Japan, designed to perform precision studies of neutrino oscillations. A neutrino beam originating at the J-PARC facility is sampled by two near detectors, approximately 280m distant from the source and directed towards the Kamioka underground facility, 295km distant, where the Super-Kamiokande water Cerenkov detector is situated. Both the on-axis (INGRID) and off-axis (ND280) near detectors employ the MIDAS framework for their data acquisition systems. Events are selected via a flexible hardware trigger, which allows mixed operating modes incorporating beam spill, cosmic and calibration triggers. Data are acquired from the front-end electronics over optical gigabit Ethernet links by custom MIDAS front-end applications distributed over a cluster of Linux computers. Event fragments from all sub-detectors are merged and logged on a central backend processor and then copied to remote storage for longterm archival. The system is also designed to allow flexible partitioning of sub-detectors for standalone diagnostics and calibration. We present the design of the DAQ system and report on experience gathered during early operation of the near detectors.

Published in:

Real Time Conference (RT), 2010 17th IEEE-NPSS

Date of Conference:

24-28 May 2010