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Helium cryogenic systems for the LEP2 and LHC projects at CERN

Philippe Lebrun

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Abstract

CERN is presently operating a large distributed 4.5 K helium cryogenic system (48 kW@4.5 K equivalent) for cooling the superconducting acceleration cavities of the 26.7 km circumference LEP2 lepton collider. This also constitutes the first part of the 1.8 K cryogenic system (about 150 kW@4.5 K equivalent) for the future Large Hadron Collider (LHC), the high-field superconducting magnets of which will operate in superfluid helium. We briefly describe the main features of each system, and review the progress of their development, construction and operation.

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CERN is presently operating a large distributed 4.5 K helium cryogenic system (48 kW@4.5 K equivalent) for cooling the superconducting acceleration cavities of the 26.7 km circumference LEP2 lepton collider. This also constitutes the first part of the 1.8 K cryogenic system (about 150 kW@4.5 K equivalent) for the future Large Hadron Collider (LHC), the high-field superconducting magnets of which will operate in superfluid helium. We briefly describe the main features of each system, and review the progress of their development, construction and operation.

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Available abstract

CERN is presently operating a large distributed 4.5 K helium cryogenic system (48 kW@4.5 K equivalent) for cooling the superconducting acceleration cavities of the 26.7 km circumference LEP2 lepton collider. This also constitutes the first part of the 1.8 K cryogenic system (about 150 kW@4.5 K equivalent) for the future Large Hadron Collider (LHC), the high-field superconducting magnets of which will operate in superfluid helium. We briefly describe the main features of each system, and review the progress of their development, construction and operation.

Key concepts: Large Hadron Collider, Physics, Superconducting magnet, Superfluid helium-4, Nuclear physics, Liquid helium, Cryogenics, Cryostat

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