Lifetime studies of the 19-channel hybrid photodiode for the CMS hadronic calorimeter

Priscilla Cushman, Brian Sherwood

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

A subset of the ∼1000 CMS hybrid photodiode tubes which passed through our quality assurance program was subjected to long term testing of their properties as a function of time. Over the course of several years, the tubes were operated under non-uniform illumination at rates up to 3.75 nW per pixel and for total integrated charges of up to 7 C at the anode. In situ measurements of quantum efficiency and gain, coupled with periodic photocathode uniformity scans, dark current and cross talk, provide information on expected time-dependent changes in the tube photosensitivity and some indication of possible failure modes.

Original languageEnglish (US)
Pages (from-to)250-258
Number of pages9
JournalNuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Volume587
Issue number2-3
DOIs
StatePublished - Mar 21 2008

Keywords

  • CMS HCAL
  • HPD
  • Hadronic calorimeter
  • Hybrid photodiode

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