Bochum 2009 – scientific programme

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HK: Fachverband Hadronen und Kerne

HK 18: Accelerators and Instrumentation I

HK 18.10: Talk

Monday, March 16, 2009, 18:45–19:00, H-ZO 80

Development of a RICH detector for CBM — •Claudia Hoehne — GSI, Darmstadt, Germany

The Compressed Baryonic Matter (CBM) experiment at the Facility for Antiproton and Ion Research (FAIR) at Darmstadt will be a dedicated heavy-ion experiment exploring the intermediate range of the QCD phase diagram with A+A collisions from 10-45 AGeV beam energy. A key observable of the physics program is a precise measurement of low-mass vector mesons and charmonium in their leptonic decay channel. In CBM, electrons will be identified using a gaseous RICH detector combined with several TRD detectors positioned after a system of silicon tracking stations which are located inside a magnetic dipole field.

The concept of the RICH detector, results on R&D as well as feasibility studies in terms of electron efficiency, pion suppression and the invariant mass distributions of low-mass vector mesons and charmonium will be presented. For the RICH detector CO₂ is foreseen as radiator gas. Glass mirrors covered with a reflective Al+MgF₂ coating are developed in cooperation with industry. As photodetector we plan to use MAPMTs coupled to fast, self triggered readout electronics. The usage of wavelengthshifter films is reinvestigated in order to increase the photon conversion efficiency for wavelengths below 300 nm.