Final Design and Experimental Validation of the Thermal Performance of the LHC Lattice Cryostats

Journal Article · Wed Jun 23 04:00:00 EDT 2004 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.1774719· OSTI ID:20653170

Bourcey, N; Capatina, O; Parma, V; Poncet, A; Rohmig, P; Serio, L; Skoczen, B; Tock, J -P; Williams, L R ^[1]

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1. CERN, European Organization for Nuclear Research, Geneva, 1211 (Switzerland)

The recent commissioning and operation of the LHC String 2 have given a first experimental validation of the global thermal performance of the LHC lattice cryostat at nominal cryogenic conditions. The cryostat designed to minimize the heat inleak from ambient temperature, houses under vacuum and thermally protects the cold mass, which contains the LHC twin-aperture superconducting magnets operating at 1.9 K in superfluid helium. Mechanical components linking the cold mass to the vacuum vessel, such as support posts and insulation vacuum barriers are designed with efficient thermalisations for heat interception to minimise heat conduction. Heat inleak by radiation is reduced by employing multilayer insulation (MLI) wrapped around the cold mass and around an aluminium thermal shield cooled to about 60 K.Measurements of the total helium vaporization rate in String 2 gives, after substraction of supplementary heat loads and end effects, an estimate of the total thermal load to a standard LHC cell (107 m) including two Short Straight Sections and six dipole cryomagnets. Temperature sensors installed at critical locations provide a temperature mapping which allows validation of the calculated and estimated thermal performance of the cryostat components, including efficiency of the heat interceptions.

• OSTI ID: 20653170
• Journal Information: AIP Conference Proceedings, Journal Name: AIP Conference Proceedings Journal Issue: 1 Vol. 710; ISSN APCPCS; ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
ALUMINIUM
AMBIENT TEMPERATURE
APERTURES
CERN LHC
COMMISSIONING
CRYOGENICS
CRYOSTATS
DESIGN
DIPOLES
EFFICIENCY
END EFFECTS
EVAPORATION
HELIUM
INTERCEPTION
OPERATION
PERFORMANCE
SUPERCONDUCTING MAGNETS
SUPERFLUIDITY
TEMPERATURE RANGE 0000-0013 K
THERMAL SHIELDS