The Silicon Tracking System of the CBM Experiment at FAIR

  • A. Lymanets GSI Helmholtzzentrum f¨ur Schwerionenforschung GmbH
Keywords: low-mass tracking system, double-sided silicon microstrip sensors, self-triggering readout

Abstract

The Compressed Baryonic Matter (CBM) experiment at FAIR (Darmstadt, Germany) is designed to study the dense nuclear matter in a fixed target configuration with heavy ion beams up to kinetic energies of 11 AGeV for Au+Au collision. The charged particle tracking with below 2% momentum resolution will be performed by the Silicon Tracking System (STS) located in the aperture of a dipole magnet. The detector will be able to reconstruct secondary decay vertices of rare probes, e.g., multistrange hyperons, with 50 мm spatial resolution in the heavy-ion collision environment with up to 1000 charged particle per inelastic interaction at the 10 MHz collision rate. This task requires a highly granular fast detector with radiation tolerance enough to withstand a particle fluence of up to 1014 neq/cm1-MeV equivalent accumulated over several years of operation. The system comprises 8 tracking stations based on double-sided silicon microstrip sensors with 58 мm pitch and strips oriented at 7.5∘ stereo angle. The analog signals are read out via stacked microcables (up to 50 cm long) by the front-end electronics based on the STS-XYTER ASIC with self-triggering architecture. Detector modules with this structure will have a material budget between 0.3% and 1.5% radiation length increasing towards the periphery. First detector modules and ladders built from pre-final components have been operated in the demonstrator experiment mCBM at GSI-SIS18 (FAIR Phase-0) providing a test stand for the performance evaluation and system integration. The results of mSTS detector commissioning and the performance in the beam will be presented.

References

B. Friman et al. The CBM Physics Book, Compressed Baryonic Matter in Laboratory Experiments. Lecture Notes in Physics 814 (2011) [ISBN: 978-3-642-13292-6]. https://doi.org/10.1007/978-3-642-13293-3

J. Heuser et al. Technical Design Report for the CBM. Silicon Tracking System (STS). GSI Report 2013-4, Darmstadt (2013), 167 p.

J. Heuser et al. Description of the STS microstrip sensors for series production. CBM-TN-19005 (technical note), Darmstadt (2019).

V.M. Borshchov et al. Pre-series production of microcables for STS detector modules at LTU Ltd. CBM Progress Report 2015 (2016), 36.

K. Kasinski, R. Kleczek, R. Szczygiel. Front-end readout electronics considerations for Silicon Tracking System and Muon Chamber. J. Inst. 11, C02024 (2016). https://doi.org/10.1088/1748-0221/11/02/C02024

K. Agarwal et al. Conceptual Design Report of the STS Cooling System. CBM-TN-18004 (technical note), Darmstadt (2018).

C. Sturm et al. mCBM@SIS18 is on its way. CBM Progress Report 2017 (2018), p. 170.

O. Vasylyev et al. Progress with the integration of the mCBM Mini Silicon Tracking System. CBM Progress Report 2017 (2018), p. 177.

P. Moreira et al. The GBT Project. Topical Workshop on Electronics for Particle Physics, Paris, France, 21-25 Sep. 2009 (CERN-2009-006), p. 342.

Published
2019-09-17
How to Cite
Lymanets, A. (2019). The Silicon Tracking System of the CBM Experiment at FAIR. Ukrainian Journal of Physics, 64(7), 607. https://doi.org/10.15407/ujpe64.7.607
Section
New Trends in High-Energy Physics (Conference materials)