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We studied the single-photoelectron detection capabilities of a multianodephotomultiplier tube H8500C-03 and its performance in high magnetic field. Ourresults show that the device can readily resolve signals at the singlephotoelectron level making it suitable for photon detection in both thresholdand ring imaging Cerenkov detectors. We also found that a large longitudinalmagnetic field, up to 300 Gauss, induces a change in the relative output of atmost 55% for an edge pixel, and of at most 15% for a central pixel. TheH8500C-03 signal loss in transverse magnetic fields it is significantly morepronounced than for the longitudinal case. Our studies of single photoelectronreduction in magnetic fields point to the field induced misfocusing of thephotoelectron extracted from the photocathode as primary cause of signal loss.With appropriate shielding this PMT could function in high magnetic fieldenvironments.

Studies of single-photoelectron response and of performance in magnetic field of a H8500C-03 photomultiplier tube