Mass characterization of multi-pixel photon counters for the T2K 280 m near detector

摘要

A few thousands multi-pixel photon counters (MPPC) have been characterized for the T2K 280 m near detector (ND280). For this purpose a test facility has been developed enabling the characterization of 128 MPPC per day. A mean gain value of 5.4 x 10s at breakdown voltage (V_(break))+1 V with a dispersion of 2.6% has been measured at 20 ℃. It is shown that the accuracy of the test facility for the gain measurement is at the level of 0.76%. At 20 ℃ the dark noise rates (DNR) have been measured in a range from ～400 up to ～730 kHz at V_(break)+1.6V.