Cathode position response of large-area photomultipliers under a magnetic field

T. Koblesky, J. Roloff, C. Polly, J. C. Peng

Research output: Contribution to journalArticlepeer-review


With the increasingly common use of large area PMTs (photomultiplier tubes) for nuclear and particle physics experiments, information on the position dependent magnetic field effects across the PMTs photocathode is important to effectively analyze and understand data collected from PMTs. Using an automated two-dimensional scanner, we have measured the PMT response to an external magnetic field as a function of the cathode position impinged by a collimated light source. This study shows a clear dependence on the cathode position in both collection efficiency and gain of the PMT in the presence of a magnetic field. In particular, a pronounced valley in the collection efficiency is observed for certain locations of the cathode when the magnetic field is transverse to the PMT axis. The pattern of the position dependence is presented for several different magnitudes and orientations of the magnetic field relative to the PMT.

Original languageEnglish (US)
Pages (from-to)40-44
Number of pages5
JournalNuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
StatePublished - Apr 1 2012


  • PMT response in magnetic field
  • Photo-multiplier tubes

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Instrumentation


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