Dresden 2013 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 35: Instrumentation

HK 35.1: Gruppenbericht

Dienstag, 5. März 2013, 14:00–14:30, WIL-A221

The Silicon Tracking System of the CBM experiment — •Johann M. Heuser — GSI Helmholtzzentrum für Schwerionenforschung GmbH

In the Compressed Baryonic Matter (CBM) experiment at FAIR, the Silicon Tracking System (STS) will perform track reconstruction and momentum determination of the charged particles created in interactions of heavy-ion beams with nuclear targets. The STS consists of 8 tracking layers located at distances between 30 cm and 100 cm downstream of the target inside the 1 T magnetic dipole field. The required momentum resolution of the order of Δp/p = 1% can only be achieved with an ultra-low material budget, imposing particular restrictions on the location of power-dissipating front-end electronics in the fiducial volume. The concept of the STS is based on 300 µm thick double-sided silicon microstrip sensors mounted onto lightweight carbon fiber support ladders. The sensors will be read out through ultra-thin multi-line micro-cables with fast self-triggering electronics at the periphery of the stations where cooling lines and other infrastructure can be placed. The mechanical construction of the STS will allow extracting the detector system and replacing individual ladders e.g. in case of radiation damage.

The status of the STS project is summarized in the presentation. An important milestone was achieved in December 2012 with the submission of the STS Technical Design Report to FAIR.
Supported by EU-FP7 HadronPhysics3, CRISP, MC-PAD, BMBF, LOEWE, HGS-HIRe, H-QM, GSI, ISTC, JINR and ROSATOM.