Document IIF

Système de refroidissement évaporatif au CO2 pour la rénovation du détecteur à pixels du CMS (solénoïde compact pour muons) au CERN.

Evaporative CO2 cooling system for the upgrade of the CMS pixel detector at CERN.

Numéro : pap. n. 188

Auteurs : DAGUIN J., ARNDT K., BERTL W., et al.


Carbon dioxide (CO2) has gained interest for evaporative cooling of high-energy particle physics detectors. Silicon tracking detectors need to be maintained at sub-zero temperature to increase their lifetime in the presence of radiation, with a material budget allocated to infrastructure as small as possible to allow maximum transparency for particle tracking. Evaporative cooling is clearly a good method to meet these goals, and CO2 coolant is an excellent option as it can withstand a large amount of radiation and has excellent thermal behavior in small diameter tubes. For these reasons, this technology has been selected for the next generation CMS Pixel detector. The design requirements for this new system are a coolant minimum temperature of -20°C and a total cooling power of about 15 kW. Following successful applications in AMS and LHCb Velo projects, the 2-Phase Accumulator Controlled Loop method (2PACL) has been chosen and adapted to the higher cooling power requirement of the CMS Pixels. This paper describes the general design of the Pixel cooling system, both inside the detector and at the plant level. On-going tests of the in-detector evaporators and long transfer line prototypes are detailed, showing how the present design will be validated. This development is part of the CMS Pixel Upgrade project, and it is being carried out in the framework of the CMS Pixel Collaboration.

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Pages : 8 p.


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  • Titre original : Evaporative CO2 cooling system for the upgrade of the CMS pixel detector at CERN.
  • Identifiant de la fiche : 30004328
  • Langues : Anglais
  • Source : 10th IIR-Gustav Lorentzen Conference on Natural Working Fluids (GL2012). Proceedings. Delft, The Netherlands, June 25-27, 2012.
  • Date d'édition : 25/06/2012


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