23-27 January 2017
Bormio, Italy
Europe/Berlin timezone

Silicon Tracking System of the future CBM experiment at FAIR

23 Jan 2017, 17:03
Bormio, Italy

Bormio, Italy


Dr Maksym Teklishyn (FAIR)


The physics aim of the Compressed Baryonic Matter (CBM) experiment is to explore the phase diagram of strongly interacting matter at highest net baryon densities and moderate temperatures in the range reachable with AA collisions between 2-45 AGeV, initially 2-14 AGeV (SIS 100). The Silicon Tracking System (STS) is the central detector for charge particle tracking and momentum determination. It is designed to be operated at high occupancies at collision rates up to 10 MHz. It is planned to reach the track reconstruction efficiency of 95%. The momentum resolution is expected to be around 1.5%. To achieve these goals, double sided double metal silicon sensors with a pitch of 58 μm are used. The sensors are mounted on light-weight carbon ladders, forming 8 stations. The read-out electronics is kept outside of the detector acceptance. The self-triggering read-out electronics is connected with the silicon microstrip sensors through the multi-line microcables. The resulting material budget is about 1%X0 per station. The entire system is going to be operated in a thermal enclosure to maintain constant temperature of -5◦C. Before the mass production of the silicon sensors, several studies are performed with prototypes. They include electrical and optical inspection, measurements with the radioactive sources and beam tests of the sensors and the read-out electronics. Particularly, we study possible impact of the severe radiation environment (10^14 neq cm^−2 ) to the sensor performance. The STS project is realized in cooperation of institutes from Germany, Poland, Russia and Ukraine. This presentation is given on behalf of the CBM Collaboration.

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