A helium freeze-out cleaner operating at atmospheric pressure

Dauvergne, J. P.; Delikaris, D.; Haug, F.; Knoops, S.

doi:10.1016/s0011-2275(05)80028-1

Cited by 5 publications

(3 citation statements)

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“…8 We would also like to acknowledge our colleagues U. Wagner and S. Claudet for their contribution and continuous support.…”

Section: Acknowledgementsmentioning

confidence: 97%

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Large Cryogenic Infrastructure for LHC Superconducting Magnet and Cryogenic Component Tests: Layout, Commissioning and Operational Experience

Calzas¹,

Chanat²,

Knoops³

et al. 2004

AIP Conference Proceedings

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The largest cryogenic test facility at CERN, located at Zone 18, is used to validate and to test all main components working at cryogenic temperature in the LHC (Large Hadron Collider) before final installation in the machine tunnel. In total about 1300 main dipoles, 400 main quadrupoles, 5 RF-modules, eight 1.8 K refrigeration units will be tested in the coming years. The test facility has been improved and upgraded over the last few years and the first 18 kW refrigerator for the LHC machine has been added to boost the cryogenic capacity for the area via a 25,000 liter liquid helium dewar. The existing 6 kW refrigerator, used for the LHC Test String experiments, will also be employed to commission LHC cryogenic components. We report on the design and layout of the test facility as well as the commissioning and the first 10,000 hours operational experience of the test facility and the 18 kW LHC refrigerator. ABSTRACTThe largest cryogenic test facility at CERN, located at Zone 18, is used to validate and to test all main components working at cryogenic temperature in the LHC (Large Hadron Collider) before final installation in the machine tunnel. In total about 1300 main dipoles, 400 main quadrupoles, 5 RF-modules, eight 1.8 K refrigeration units will be tested in the coming years.The test facility has been improved and upgraded over the last few years and the first 18 kW refrigerator for the LHC machine has been added to boost the cryogenic capacity for the area via a 25,000 liter liquid helium dewar. The existing 6 kW refrigerator, used for the LHC Test String experiments, will also be employed to commission LHC cryogenic components.We report on the design and layout of the test facility as well as the commissioning and the first 10,000 hours operational experience of the test facility and the 18 kW LHC refrigerator.

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“…8 We would also like to acknowledge our colleagues U. Wagner and S. Claudet for their contribution and continuous support.…”

Section: Acknowledgementsmentioning

confidence: 97%

“…An on-line low pressure helium purification system (POL) is used to purify the flow coming from the warm pumping units [8]. It has a capacity of 18 g/s and can be directly connected to the low pressure of any of the refrigerators.…”

Section: General Layoutmentioning

confidence: 99%

Large Cryogenic Infrastructure for LHC Superconducting Magnet and Cryogenic Component Tests: Layout, Commissioning and Operational Experience

Calzas¹,

Chanat²,

Knoops³

et al. 2004

AIP Conference Proceedings

View full text Add to dashboard Cite

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“…The pumping speed of the Roots group is 1.6 g/s at 24 mbar. After online purification [5], the pumping line is connected to the recovery line back to the helium liquefier, which, in turn, feeds the central dewar. An 80 m 3 capacity balloon is predisposed to receive excess helium evaporated during transients to normal state (quenches) of the superconducting magnets under test.…”

Section: Layout Of the Installationsmentioning

confidence: 99%

The test facility for the short prototypes of the LHC superconducting magnets

Delsolaro¹,

Arn²,

Bottura³

et al. 2002

AIP Conference Proceedings

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The LHC development program relies on cryogenic tests of prototype and model magnets. This vigorous program is pursued in a dedicated test facility based on several vertical cryostats working at superfluid helium temperatures. The performance of the facility is detailed. Goals and test equipment for currently performed studies are reviewed: quench analysis and magnet protection studies, measurement of the field quality, test of ancillary electrical equipment like diodes and busbars. The paper covers the equipment available for tests of prototypes and some special series of LHC magnets to come. ABSTRACTThe LHC development program relies on cryogenic tests of prototype and model magnets. This vigorous program is pursued in a dedicated test facility based on several vertical cryostats working at superfluid helium temperatures. The performance of the facility is detailed. Goals and test equipment for currently performed studies are reviewed: quench analysis and magnet protection studies, measurement of the field quality, test of ancillary electrical equipment like diodes and busbars. The paper covers the equipment available for tests of prototypes and some special series of LHC magnets to come.

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Upgrade of the CERN Cryogenic Station for Superfluid Helium Testing of Prototype LHC Superconducting Magnets

Benda

Dauvergne

Haug

et al. 1997

Proceedings of the Sixteenth International Cryogenic Engineering Conference/International Cryogenic Materials Conference

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The cryogenic infrastructure of the station for testing LHC prototype superconducting magnets in superfluid helium below 2 K has been upgraded. Liquid nitrogen precooling has permitted to increase the liquefaction capacity of the refrigerator. The addition of cold centrifugal compressors with a pressure ratio of 3:1 has boosted the capacity of the warm pumping unit. To ensure adaptation of the pumping capacity, a heater-and-valve box allows to bypass the cold compressors. This box also comprises a 32 kW electrical heater for warming up the low-pressure gaseous helium before it enters the volumetric warm pumping unit. Possible impurities in the helium returning from the subatmospheric circuits are trapped in a freeze-out helium cleaner. Automatic process control and supervision permit unattended operation and optimal management of the helium inventory.

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A helium freeze-out cleaner operating at atmospheric pressure

Cited by 5 publications

References 0 publications

Large Cryogenic Infrastructure for LHC Superconducting Magnet and Cryogenic Component Tests: Layout, Commissioning and Operational Experience

Large Cryogenic Infrastructure for LHC Superconducting Magnet and Cryogenic Component Tests: Layout, Commissioning and Operational Experience

The test facility for the short prototypes of the LHC superconducting magnets

Upgrade of the CERN Cryogenic Station for Superfluid Helium Testing of Prototype LHC Superconducting Magnets

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