Performance of a multi-anode photomultiplier employing an ultra bi-alkali photo-cathode and rugged dynodes

T. Toizumi*, S. Inagawa, T. Nakamori, J. Kataoka, Y. Tsubuku, Y. Yatsu, T. Shimokawabe, N. Kawai, T. Okada, I. Ohtsu

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)


We report on the performance testing of a multi-anode photomultiplier (MAPMT), the R8900-200-M16MOD-UBA, newly developed by Hamamatsu Photonics K.K. Although the R8900 series offers the great advantage of a highly sensitive surface (≥80% of physical area), the quantum efficiency (Q.E.) was relatively low (at up to 20%). This paper describes two substantial changes we have made to the R8900-200-M16MOD-UBA: (1) improving the Q.E. to the 40% level by employing an ultra bi-alkali (UBA) photo-cathode and (2) constructing a rugged dynode that can withstand vibration for future use in space. We measured each pixel signal at the single photoelectron level and the signals of scintillation photons by using a 16-pixel plastic scintillator array. Thanks to high Q.E., good energy resolution of 29.9% (FWHM) was obtained for 59.5 keV γ-rays. We also demonstrated tolerance to vibration up to 17 Grms in possible launching vehicles.

Original languageEnglish
Pages (from-to)168-173
Number of pages6
JournalNuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Issue number1-2
Publication statusPublished - 2009 Jun 1
Externally publishedYes


  • Multianode photomultiplier
  • Ultra bi-alkali

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Instrumentation


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