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The development of the CO2 cooling plants for the upgrade silicon detectors of ATLAS and CMS at CERN.

Number: 1246

Author(s) : VERLAAT B., PETAGNA P., ZWALINSKI L., DAGUIN J., BHANOT V., DAVOINE L., SLIWA K., HERPIN Y., LANDRAUD C., TEIXEIRA D., ZIMMY M., GALUSZKA S.

Summary

At CERN there will be a major upgrade in 2026 of the Large Hadron Collider and its particle tracking detectors ATLAS and CMS. The new upgraded silicon tracking detectors will be cooled with evaporative CO2 in accumulator controlled pumped loops. The primary cooling of these plants will be commercial R744 refrigeration systems. The plants will run as cold as -45 ⁰C, wherefore a primary cooling of -53 ⁰C is needed. The cooling heat-loads of the detectors ATLAS and CMS are 290 kW and 570 kW. The cooling system will be segmented in multiple parallel plants operating individually with a common CO2 storage. This paper describes the development activities of these plants with the new challenges highlighted. New developments with respect to previous accumulator pumped loops are the use of a common CO2 storage at the surface to minimize underground CO2 storage, the use of accumulator flow through and the development of special heat exchangers.

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Pages: 10 p.

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Details

  • Original title: The development of the CO2 cooling plants for the upgrade silicon detectors of ATLAS and CMS at CERN.
  • Record ID : 30032744
  • Languages: English
  • Source: 16th IIR-Gustav Lorentzen Conference on Natural Refrigerants (GL2024). Proceedings. University of Maryland, College Park, Maryland, USA, August 11-14 2024
  • Publication date: 2024/08
  • DOI: http://dx.doi.org/10.18462/iir.gl.2024.1246

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