Bonn 2020 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 63: Combined Instrumentation Session: Semiconductor Detectors (joint session HK/T)

HK 63.5: Talk

Friday, April 3, 2020, 12:00–12:15, H-HS XV

R&D for the Cooling Demonstrator of the CBM Silicon Tracking System (STS) — •Kshitij Agarwal for the CBM collaboration — Physikalisches Institut der Universität Tübingen

As the core detector of the CBM experiment, the Silicon Tracking System (STS) located in the dipole magnet aims to reconstruct charged-particle tracks & momentum from beam-target interactions.
Due to the expected non-ionising irradiation damage (fluence - 10¹⁴ n_eq(1MeV)/cm²), the silicon microstrip sensors will dissipate < 6 mW/cm² at -10^∘C. Thus it is imperative to keep the sensors at or below -10^∘C at all times to avoid thermal runaway and reverse annealing by forced N₂ cooling. The corresponding electronics connected via ultra-thin microcables are placed outside detector acceptance with a dedicated cooling system used to remove ∼ 40kW power dissipated.
To experimentally verify the aforementioned concepts under realistic mechanical constraints, a thermal demonstrator comprising a half-layer of STS is under development. This contribution will describe the electronics cooling system design and respective cooling performance simulations. Experimental proof-of-principle tests/simulations with 3M^™ Novec^™ 649 for electronics cooling and air cooling for silicon sensor cooling will be shown. Lastly, future plans on the demonstrator integration and design will be also presented.
This work is supported by GSI/FAIR.