Karlsruhe 2024 – scientific programme

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T: Fachverband Teilchenphysik

T 11: Silicon trackers 1

T 11.6: Talk

Monday, March 4, 2024, 17:15–17:30, Geb. 30.22: kl. HS B

Characterization of the bi-phase CO2 cooling system MARTA for the ITk pixel detector Quality Control — Klaus Desch, Matthias Hamer, •Dominik Hauner, Florian Hinterkeuser, Nico Klein, and Alexandra Wald — Physikalisches Institut der Universität Bonn

Due to the upgrade of the Large Hadron Collider (LHC) to the High-Luminosity-LHC, a significant upgrade of the ATLAS detector is required, including the complete replacement of the Inner Detector with the new Inner Tracker (ITk) silicon detector. The ITk consists of a silicon strip detector and a silicon pixel detector.

During production, several building blocks of the ITk pixel detector, the modules, services and local supports, will be combined into so-called Loaded Local Supports (LLS) at several institutes. The LLS will undergo a rigorous quality control (QC) process before being shipped to CERN, where they are integrated into the ITk. During operation, the LLS will be cooled with a bi-phase CO2 system. In order to avoid any contamination of the evaporators, such a system will also be used for the QC of the LLS.

At the University of Bonn, a MARTA CO2 cooling plant has been deployed for this purpose. In this talk I will present the results of a first characterization of MARTA in Bonn and discuss the cooling capacity in regards to the QC.

Keywords: ATLAS Inner Tracker; Outer Barrel; MARTA; C02 cooling system; ITk quality control