Author/Authors :
T. Toizumi، نويسنده , , T. and Inagawa، نويسنده , , S. and Nakamori، نويسنده , , T. and Kataoka، نويسنده , , J. and Tsubuku، نويسنده , , Y. and Yatsu، نويسنده , , Y. and Shimokawabe، نويسنده , , T. and Kawai، نويسنده , , N. and Okada، نويسنده , , T. and Ohtsu، نويسنده , , I.، نويسنده ,
Abstract :
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 G rms in possible launching vehicles.
