München 2019 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 44: Instrumentation IX

HK 44.3: Talk

Wednesday, March 20, 2019, 17:15–17:30, HS 11

Development of cooling demonstrator for the CBM Silicon Tracking System — •Kshitij Agarwal for the CBM collaboration — Physikalisches Institut - Eberhard Karls Universität Tübingen, Tübingen, Germany

As the core detector of the CBM experiment, the Silicon Tracking System (STS) located in the dipole magnet provides track reconstruction & momentum determination of charged particles from beam-target interactions.

Due to the expected 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 microcables are placed outside detector acceptance and bi-phase CO₂ cooling will be 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 recent R&D on several subcomponents, such as CO₂ cooling plant and corresponding distribution system, optimised CO₂ heat exchanger plates, dummy silicon heaters, thermal enclosure, etc. In addition, future plans on the demonstrator integration and design will be also presented.

This work is supported by GSI/FAIR.