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Development of pumped CO2 systems for the upgrade detector cooling at CERN.

Summary

At CERN, evaporative CO2 is the baseline cooling solution for the thermal management of the phase-II silicon detectors which will be installed in 2025 in the ATLAS and CMS experiments. Since 2008 CO2 cooling is used in 3 detectors with capacities ranging 1 to 15 kW at -30°C. A special pumped cycle was developed to guarantee accurate temperature control under all operational conditions.
The challenges for the upgrade are the large increase of the cooling power (300 - 550 kW), the large number of parallel operating evaporators (~1000x), the low evaporative temperature (-45°C) and the implementation of a primary R744 trans-critical cooling system, making the system to work with natural refrigerants only.
This paper describes the development of the pumped systems and the new idea of implementing surface storage of CO2. It will discuss the prototypes under construction and the simulations supporting the developments.

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Development of pumped CO2 systems for the upgrade detector cooling at CERN - Summary

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Details

  • Original title: Development of pumped CO2 systems for the upgrade detector cooling at CERN.
  • Record ID : 30027950
  • Languages: English
  • Subject: Technology
  • Source: 14th IIR-Gustav Lorentzen Conference on Natural Refrigerants(GL2020). Proceedings. Kyoto, Japon, December 7-9th 2020.
  • Publication date: 2020/12/07
  • DOI: http://dx.doi.org/10.18462/iir.gl.2020.1143

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