The status of the batch test of 20 inch MCP-PMT

Abstract

The JUNO needs the 20 in. large area photo detector with 20,000 PMTs, which have large sensitive area, high quantum efficiency, high gain for good single photoelectron detection. In 2009, the IHEP researchers have designed a new type of 20 in. PMT for JUNO. Using the small MCP units replace the bulky Dynode chain in the large area PMTs for better performance improvement. After many years R&D process, a lot of prototypes were produced within 5 in., 8 in., 20 in. for the performance test by the MCP-PMT evaluation system built at IHEP. The final version 20 in. MCP-PMT was produced at the end of 2015, The PMT mass production and batch test system were ran in 2017 achieving quick test of all performance for every PMT instead of sampling. This manuscript will introduce this batch test equipment and it’s preliminary result.