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Volume 358 - 36th International Cosmic Ray Conference (ICRC2019) - CRI - Cosmic Ray Indirect
A study on the impact of LHAASO-WCDA PMT afterpulse
B. Chen,* B. Gao, M. Chen, Z. Pang, M. Zha, Z. Yao
*corresponding author
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Pre-published on: 2019 July 22
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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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