CsI-photocathode in-situ monitoring system in gaseous and noble-liquid photomultipliers

D. Vartsky, A. Roy, A. Coimbra, S. Shchemelinin, I. Israelashvili, L. Arazi, E. Erdal, A. Breskin

Research output: Contribution to journalArticlepeer-review

1 Scopus citations


A system is described for in-situ monitoring of VUV-photocathode response in gas-avalanche and noble-liquid photon detectors. It consists of a VUV light source, optical-fiber-based optics and a reference photodiode. The system permits real-time monitoring of detector photosensitivity variations due to atmospheric conditions, impurities or aging effects by photons and avalanche ions. We present the system's parameters such as, spectral response, light transmission and operation of the reference photodiode at cryogenic temperatures. We demonstrate a quantitative monitoring of CsI-photocathode deterioration following its exposure to various atmospheric conditions.

Original languageEnglish
Article numberT07006
JournalJournal of Instrumentation
Issue number7
StatePublished - 30 Jul 2019


  • Electron multipliers (gas)
  • GEM
  • InGrid
  • MHSP
  • Micropattern gaseous detectors (MSGC
  • Photoemission
  • Photon detectors for UV
  • etc)
  • solid-photocathodes)
  • visible and IR photons (gas) (gas-photocathodes

ASJC Scopus subject areas

  • Mathematical Physics
  • Instrumentation


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