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Trigger and data acquisition system for the N-N¯ experiment

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23 Author(s)
Baldo-Ceolin, M. ; Dipartimento di Fisica G. Galilei, Padova Univ., Italy ; Benetti, P. ; Bobisut, F. ; Bonaiti, V.
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The trigger and data acquisition system for the N-N ¯ experiment at the Institute Laue-Langevin at Grenoble is described along with CAMAC modules especially designed for this experiment. The trigger system is organized around three logical levels; it works in the presence of a high level of beam-induced noise, without beam pulse synchronization, looking for a very rare signal. The final trigger rate is 4 Hz, not very different from the beam off rate, while the trigger efficiency for the antineutron annihilation detection is >0.7. The data acquisition is based on a MicroVAX II computer, in a cluster with four VaxStations, interfaces to CAMAC, and uses a modified version of the DAQP software developed at CERN. The system, has been working for a year with high efficiency and reliability

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Nuclear Science, IEEE Transactions on  (Volume:38 ,  Issue: 2 )