Darmstadt 2016 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 15: Instrumentation IV

HK 15.1: Gruppenbericht

Montag, 14. März 2016, 16:30–17:00, S1/01 A2

The Silicon Tracking System of the CBM Experiment at FAIR — •Anton Lymanets for the CBM collaboration — GSI Darmstadt, Germany

The Compressed Baryonic Matter experiment will investigate the phase diagram of strongly interacting matter in nucleus-nucleus collisions at highest net baryon densities using a number of rare probes and bulk observables. Its key component – the Silicon Tracking System – will reconstruct up to 1000 charged particle trajectories per Au+Au collision at up to 10 MHz interaction rate and will measure their momenta. The system design employs high-granularity sensors matching the non-uniform track density and fast self-triggering electronics with a the free streaming data acquisition system and online event selection. The required momentum resolution of Δ p/p∼1.5% dictates the need of the low-mass design with material budget of 0.3-1%X₀ per station.

The eight tracking stations of the STS operating in the aperture of a dipole magnet with 1 T field will cover the polar angles between 2.5^∘ and 25^∘. The stations with a total sensor area of 4.2 m² will comprize about 1000 detector modules consisting of double-sided silicon microstrip sensors, ultra-thin readout cables and front-end electronics that are mounted onto lightweight carbon fiber support strctures.

The progress with the final components will be discussed, in particular sensors, readout cables and readout ASICs. The assembly of the detector module components into full-scale prototypes and the engineering of the mechanical structure of the STS will be presented.

*Supported by EU-Horizon2020 CREMLIN and BMBF.