JUNO's two PMT types differ strongly in dark count rate stability: NNVT MCP-PMTs need about 50 hours to cool and shift 4-12% per degree Celsius with temperature, while HPK dynode PMTs stabilize faster and shift only about 2% per degree.
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Dark Count Rate Stability of JUNO 20-inch PMTs in Mass Testing
JUNO's two PMT types differ strongly in dark count rate stability: NNVT MCP-PMTs need about 50 hours to cool and shift 4-12% per degree Celsius with temperature, while HPK dynode PMTs stabilize faster and shift only about 2% per degree.