Afterpulse Measurements of R7081 Photomultipliers for the Double Chooz Experiment

TL;DR

This paper reports on afterpulse measurements of 473 photomultipliers used in the Double Chooz experiment, providing data on occurrence probability and timing distributions to ensure detector performance.

Contribution

It offers detailed afterpulse characterization of R7081 photomultipliers, including probability and timing, with comparative analysis using various light sources and measurement techniques.

Findings

Average afterpulse occurrence probability quantified

Time distribution of afterpulses characterized

Enhanced understanding of afterpulse behavior in photomultipliers

Abstract

We present the results of afterpulse measurements performed as qualification test for 473 inner detector photomultipliers of the Double Chooz experiment. The measurements include the determination of a total afterpulse occurrence probability as well as an average time distribution of these pulses. Additionally, more detailed measurements with different light sources and simultaneous charge and timing measurements were performed with a few photomultipliers to allow a more detailed understanding of the effect. The results of all measurements are presented and discussed.