After five years of operation in the CTAO LST-1 camera, removed PMTs showed no increase in afterpulsing, while stored spare tubes worsened, indicating operation offsets helium-driven aging.
Bernlöhr,Impact of atmospheric parameters on the atmospheric Cherenkov technique, Astroparticle Physics12(2000) 255
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Competition between Increasing and Decreasing Effects of the Afterpulsing Rate of PMTs during Night-Sky Observations
After five years of operation in the CTAO LST-1 camera, removed PMTs showed no increase in afterpulsing, while stored spare tubes worsened, indicating operation offsets helium-driven aging.