Münster 2011 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 27: Instrumentierung VI

HK 27.6: Vortrag

Dienstag, 22. März 2011, 17:45–18:00, HS1

Quantum efficiency of multianode photomultiplier tubes and beam test results for the development of a CBM RICH detector* — •Jan Kopfer — Bergische Universität Wuppertal, Germany

The Compressed Baryonic Matter (CBM) experiment at the future Facility for Antiproton and Ion Research (FAIR) is dedicated to explore the intermediate range of the QCD phase diagram using nucleus-nucleus collisions from 8-45 GeV/nucleon beam energy.

A gaseous RICH detector is developed for clean and efficient electron identification. Its photodetector is planned to be based on H8500 Hamamatsu multianode photomultiplier tubes (MAPMTs) whose characteristics are important for the detector performance.

On the way towards a scalable CBM RICH prototype an array of four MAPMTs with self triggered readout electronics has successfully been tested at the Cern PS/T10 beamline in a proximity focussing test beam setup. We present the conceptual design of the CBM RICH detector, discuss results of quantum efficiency measurements of H8500 MAPMTs with bialkali and superbialkali cathodes as well as borosilicate and UV glass windows, and report on the beam test results.

* supported by the German Ministry for Research and Education (BMBF Verbundforschung 06WU9195I)