Reduction of Coincident Photomultiplier Noise Relevant to Astroparticle Physics Experiment

Details Reduction of Coincident Photomultiplier Noise Relevant to Astroparticle Physics Experiment Reduction of Coincident Photomultiplier Noise Relevant to Astroparticle Physics Experiment

2005-03-05

arxiv.org/abs/physics/0503044v1

Nucl.Instrum.Meth.A545:225-233,2005

Physics

Instrumentation and Detectors

Submitted to NIM A

Scientific paper

10.1016/j.nima.2005.01.319

In low background and low threshold particle astrophysics experiments using observation of Cherenkov or scintillation light it is common to use pairs or arrays of photomultipliers operated in coincidence. In such circumstances, for instance in dark matter and neutrino experiments, unexpected PMT noise events have been observed, probably arising from generation of light from one PMT being detected by one or more other PMTs. We describe here experimental investigation of such coincident noise events and development of new techniques to remove them using novel pulse shape discrimination procedures. When applied to data from a low background NaI detector with facing PMTs the new procedures are found to improve noise rejection by a factor of 20 over conventional techniques, with significantly reduced loss of signal events.

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