A 6 kW at 4.5 K Helium Refrigerator for CERN’s Cryogenic Test Station

Gistau, G.; Bonneton, M.

doi:10.1007/978-1-4615-2522-6_66

Cited by 7 publications

(1 citation statement)

References 3 publications

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“…The main refrigerator (MR), manufactured by Air Liquide in 1991 for an equivalent cooling capacity of 6 kW at 4.5 K [3], will be used to cool-down the magnets from 100 K to 4.5 K and then ensure the steady-state operation of all magnets at 4.5 K, which includes the cooling of the current leads.…”

Section: Helium Refrigeratorsmentioning

confidence: 99%

Commissioning of the Cryogenic System for the ATLAS Superconducting Magnets

Delruelle¹,

Haug²,

Kate³

et al. 2006

AIP Conference Proceedings

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The paper describes the test results of the helium cryoplant for the superconducting magnets of the ATLAS particle detector at CERN. It consists of two refrigerators used in common by all the magnets and of two proximity cryogenic systems (PCS) interfacing respectively the toroids and the central solenoid. Emphasis is given to the commissioning of the refrigerators: the main unit of 6 kW equivalent capacity at 4.5 K and the thermal shield refrigerator providing 20 kW between 40 K and 80 K. The first unit is used for refrigeration at 4.5 K and for the cooling of three sets of 20 kA current leads, while the second one provides, in addition to the 20 kW refrigeration of the thermal shields, 60 kW for the cool-down to 100 K of the 660 ton cold mass of the magnets. The tests, carried out with the equipment in the final underground configuration, are extended to the PCS that includes the large liquid helium centrifugal pumps (each providing 1.2 kg/s) for forced-flow cooling of the magnets and the complex distribution system needed to fulfil their different operating requirements. COMMISSIONING OF THE CRYOGENIC SYSTEM FOR THE ATLAS SUPERCONDUCTING MAGNETS ABSTRACTThe paper describes the test results of the helium cryoplant for the superconducting magnets of the ATLAS particle detector at CERN. It consists of two refrigerators used in common by all the magnets and of two proximity cryogenic systems (PCS) interfacing respectively the toroids and the central solenoid. Emphasis is given to the commissioning of the refrigerators: the main unit of 6 kW equivalent capacity at 4.5 K and the thermal shield refrigerator providing 20 kW between 40 K and 80 K. The first unit is used for refrigeration at 4.5 K and for the cooling of three sets of 20 kA current leads, while the second one provides, in addition to the 20 kW refrigeration of the thermal shields, 60 kW for the cool-down to 100 K of the 660 ton cold mass of the magnets. The tests, carried out with the equipment in the final underground configuration, are extended to the PCS that includes the large liquid helium centrifugal pumps (each providing 1.2 kg/s) for forcedflow cooling of the magnets and the complex distribution system needed to fulfill their different operating requirements.

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Section: Helium Refrigeratorsmentioning

confidence: 99%