SMuK 2023 – scientific programme

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T: Fachverband Teilchenphysik

T 21: Si-Strips/CMS, Pixel/Sensor

T 21.2: Talk

Monday, March 20, 2023, 16:45–17:00, WIL/C307

Thermal Measurements of 2S Modules with an evaporative CO₂ Cooling System for the CMS Phase-2 Outer Tracker Upgrade — Christian Dziwok², Lutz Feld¹, Katja Klein¹, Martin Lipinski¹, •Vanessa Oppenländer¹, Alexander Pauls¹, Oliver Pooth², Nicolas Röwert¹, Michael Wlochal¹, and Tim Ziemons² — ¹1. Physikalisches Institut B, RWTH Aachen — ²3. Physikalisches Institut B, RWTH Aachen

The new operating conditions of the future HL-LHC require a replacement of the complete silicon tracking system of the CMS experiment as part of the CMS Phase-2 Upgrade. For the Phase-2 Outer Tracker new silicon strip modules, so-called 2S modules, are being developed that consist of two silicon sensors stacked on top of each other. The high radiation conditions of the HL-LHC lead to a higher leakage current in the silicon sensors, which is exponentially dependent on the sensor temperature. An evaporative CO₂ cooling system will be used to cool the modules and ensure a successful operation. In an unstable cooling scenario it is possible that the module enters an uncontrolled self-heating loop called thermal runaway. Therefore it is crucial that the thermal properties and performance of the 2S modules and the cooling structure are tested and characterized. In this talk measurements with a test setup of 2S modules on a cooling structure using a custom CO₂ cooling system will be presented.