Mainz 2022 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 47: Instrumentation XI

HK 47.6: Talk

Wednesday, March 30, 2022, 17:15–17:30, HK-H3

The Cooling Concept of the CBM Silicon Tracking System — •Kshitij Agarwal for the CBM collaboration — Eberhard Karls Universität Tübingen, Tübingen, Germany

As the core detector of the CBM experiment at the under-construction FAIR facility, the Silicon Tracking System (STS) located in the dipole magnet (1 T.m) provides track reconstruction (> 95%) & momentum determination (< 2%) of charged particles from the beam-target interactions (sqrt(s_NN) = 2.9 - 4.9 GeV). Due to the expected non-ionising irradiation damage at the end-of-lifetime (10¹⁴ n_eq(1MeV)/cm²), the innermost silicon microstrip sensors will dissipate up to 6 mW/cm² at -10^∘C. So, it is crucial to always keep the silicon sensors at temperatures close to -10^∘C to avoid thermal runaway and reverse annealing by introducing minimal material budget in the detector acceptance.

The first part of this contribution will focus on the silicon sensor cooling concept, where cold gas (at -10^∘C) will be carried via thin carbon-fibre (CF) perforated tubes to directly cool the innermost silicon sensors. This will include the CFD Analysis of the sensor cooling concept with a ’toy model’, and manufacturing of the perforated CF-tubes. The second part will touch upon the electronic cooling concept, where mono-phase 3M NOVEC 649 (at -40^∘C) will be used to keep the electronics temperature at -10^∘C. This will be substantiated with the CFD & Thermal Analysis. The contribution will be concluded by presenting the status of the thermal demonstrator, which will demonstrate the cooling concept under realistic operating conditions.