The Application of 20 inch MCP-PMT In LHAASO-WCDA
X. You*, B. Gao, M. Chen, H. Li, C. Liu, K. Li on behalf of the LHAASO Collaboration
July 30, 2021
March 18, 2022
In the Large High Altitude Air Shower Observatory (LHAASO), the main physics objectiveof the Water Cherenkov Detector Array (WCDA) is to survey the gamma-ray sky continuouslyin the energy range from 100 GeV to PeV. The Water Cherenkov detector array, covering an area of about 78,000𝑚$^2$ area, is constituted by 3120 detector units divided into 3 separate arrays. In the second and third array are installed 2220 20" PMTs instead of the 8 PMT usedin the first 150×150𝑚$^2$ array. This type of PMT has large sensitive area, high quantum efficiency (QE), and large peak-to-valley (P/V) ratio for single photoelectron detection.In this work, we will report on the application of 20 inch MCP-PMT.
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