Performance of a multi-anode photomultiplier employing an ultra bi-alkali photo-cathode and rugged dynodes
✍ Scribed by Toizumi, T.; Inagawa, S.; Nakamori, T.; Kataoka, J.; Tsubuku, Y.; Yatsu, Y.; Shimokawabe, T.; Kawai, N.; Okada, T.; Ohtsu, I.
- Book ID
- 103857462
- Publisher
- Elsevier Science
- Year
- 2009
- Tongue
- English
- Weight
- 779 KB
- Volume
- 604
- Category
- Article
- ISSN
- 0168-9002
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✦ Synopsis
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 (X80% 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) photocathode 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 g-rays. We also demonstrated tolerance to vibration up to 17 G rms in possible launching vehicles.