Gießen 2007 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 47: Instrumentation und Anwendungen

HK 47.4: Talk

Thursday, March 15, 2007, 15:00–15:15, F

Status of the RPC TOF System of the Compressed Baryonic Matter Experiment — •Everard Cordier for the CBM collaboration — Physikalisches Institut, Heidelberg, Germany

The Compressed Baryonic Matter Experiment (CBM) is dedicated to the study of the ultra-dense hadronic matter produced in heavy-ion collisions at energies ranging from 2 AGeV to 45 AGeV. A time of flight (TOF) detector system based on timing Resistive Plate Chambers (tRPC) will be used for hadron identification. The TOF wall will be placed at 10 m from the target, providing a polar angle acceptance of 30 degrees and full azimuthal coverage. The total area is in the order of 150 m² and the number of cells has to be about 60.000 in order to keep the occupancy below 5%. Despite the very different rates changing with the polar angle from 1kHz/cm² to 20kHz/cm² the response over the full area has to be homogeneous with a time resolution better than 80 ps and an efficiency close to 100%.

Various investigations are being performed to improve the rate capability of tRPCs: low resistivity material (ceramic, semi-conductive glass), warm float glass and reduced thickness of the glass electrodes. Based on a realistic description of the RPC response we will present results on simulations of the TOF-layout, mainly discussing the capabilities for reconstruction of rare probes in the charm and strange sector.

Supported by EU-FP6 HADRONPHYSICS (RII3-CT-2004-506078) and BMBF (06HD154) and GSI (HD-HER)