A study on the impact of the LHAASO-WCDA photomultiplier tube afterpulse
July 22, 2019
The Water Cerenkov Detector Array (WCDA) is an important part of Large High Altitude Air Shower Observatory (LHAASO). It is mainly composed of large photomultiplier tubes (PMT), including 8-inch and 20-inch in diameter. In the PMT test, the afterpulse signal time distribution shows a specific structure in time of 20 μs range after the main pulse. The afterpulse ratio also varies under different main pulse intensity, which will have an effect on the shower trigger and data taking. In this paper, some characteristics of the afterpulse and the influence of light intensity on the afterpulse are studied. It can help us understand performance of photomultiplier tubes and improve the data analysis of WCDA
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