Abstract
Abstract Researchers of IHEP have conceived a new concept of MCP-PMT several years ago. Small MCP units replace the bulky Dynode chain in the large PMTs. In addition, transmission and reflection photocathodes are in the same glass bulb to enhance the efficiency of photoelectron conversion. After three years of R&D, a number of 8 inch prototypes were produced in 2013. The 20 inch prototypes followed in 2014 and their performances were improved a lot in 2015. This type of PMT has large sensitive area, high quantum efficiency (QE), and large peak-to-valley (P/V) ratio for good single photoelectron detection. Taking in account the performance and cost of PMT and the radioactivity of PMT glass, JUNO ordered 15000 20-inch MCP-PMT from North Night Vision of Technology CO.(NNVT) in Dec.2015. The MCP-PMT collaboration group finished to build the mass production line in Nanjing, and finished the batch test system in the same place in 2016. From 2017 to 2019, all the 20-inch PMTs are produced and tested individually in NNVT. This paper will focus on the mass production and batch test result of 6000 pieces of MCP-PMT prototypes for JUNO.
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