Data Acquisition System for the NCDs at SNO

Physics – Nuclear Physics

Scientific paper

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Scientific paper

The NCDs at SNO detect thermalized neutrons liberated by the NC interaction between solar neutrinos and SNO's heavy water. The NCD data acquisition system (NCDDAQ) is designed to maximize the identification of these neutron events from various types of backgrounds on an event-by-event basis. The NCDDAQ is capable acquiring data at rates much higher than the expected solar neutrino event rate. This allows the NCDs to monitor the time evolution of potential neutrino signals from galactic supernovae. The NCDDAQ consists of a mixture of commericially available electronics equipment and University of Washington custom--built electronics, and is controlled by our custom--built Online Realtime Control and Acquisition (ORCA) object--oriented software program. The NCDDAQ is fully integrated into SNO's PMT data acquisistion system to provide shared trigger information and a combined data stream. This work was supported by the U. S. Department of Energy Office of Nuclear Physics.

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