Münster 2011 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 27: Instrumentierung VI

HK 27.5: Talk

Tuesday, March 22, 2011, 17:30–17:45, HS1

Single photon detection properties of H8500 MAPMTs for the CBM RICH detector ^* — •Christian Pauly — Bergische Universität Wuppertal

The Compressed Baryonic Matter (CBM) experiment, being build at the Facility for Antiproton and Ion Research (FAIR) at Darmstadt, is being designed to investigate heavy-ion collisions in fixed target mode at energies ranging from 10-45 GeV/nucleon. A key component for particle identification in the proposed setup is a gaseous RICH detector using CO₂ as radiator gas. For the photon detector it is foreseen to use Hamamatsu H8500 Multianode PMTs, which provide a good tradeoff in terms of single-photon detection, geometric coverage and price per instrumented area.

We have studied the single photon detection properties of these tubes, in particular in presence of a magnetic field since the CBM RICH detector will be placed in direct vicinity to a superconducting dipole magnet. The possible use of wavelength-shifting coatings to enhance the quantum efficiency in the UV range will be discussed.

For autumn 2011 we plan a fullscale prototype test using 16 MAPMTs in a realistic gas radiator setup. We will report on the ongoing preparations for this test.

^*Supported by the German Ministry for Research and Education, 06WU9195I