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Steady state heat transfer experimental studies of LHC superconducting cables operating in cryogenic environment of superfluid helium

The heat management is a basic and fundamental aspect of the superconducting magnets used in the CERN Large Hadron Collider. Indeed, the coil temperature must be kept below the critical value, despite the heat which can be generated or deposited in the magnet during the normal operations. Therefore,...

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Autor principal: Santandrea, Dario
Lenguaje:eng
Publicado: 2015
Materias:
Acceso en línea:http://cds.cern.ch/record/1988061
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author Santandrea, Dario
author_facet Santandrea, Dario
author_sort Santandrea, Dario
collection CERN
description The heat management is a basic and fundamental aspect of the superconducting magnets used in the CERN Large Hadron Collider. Indeed, the coil temperature must be kept below the critical value, despite the heat which can be generated or deposited in the magnet during the normal operations. Therefore, this thesis work aims at determining the heating power which can be extracted from the superconducting cables of the LHC, specially through their electrical insulation which represents the main thermal barrier. An experimental measurement campaign in superfluid helium bath was performed on several samples reproducting the main LHC magnets. The heating power was generated in the sample by Joule heating and the temperature increase was measured by means of Cernox bare chip and thermocouples. An innovative instrumentation technique which also includes the in-situ calibration of the thermocouples was developed. A thorough uncertainty analysis on the overall measurement chain concluded the experimental setup. The present study allowed to thermally characterize the main LHC magnets: Main Bending, Main Quadrupole and MQXA. The results show the thermal magnets behaviour as a function of bath temperature, heating configuration of the sample, sensor position and the hydrostatic helium pressure effect.
id cern-1988061
institution Organización Europea para la Investigación Nuclear
language eng
publishDate 2015
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spelling cern-19880612019-09-30T06:29:59Zhttp://cds.cern.ch/record/1988061engSantandrea, DarioSteady state heat transfer experimental studies of LHC superconducting cables operating in cryogenic environment of superfluid heliumAccelerators and Storage RingsEngineeringThe heat management is a basic and fundamental aspect of the superconducting magnets used in the CERN Large Hadron Collider. Indeed, the coil temperature must be kept below the critical value, despite the heat which can be generated or deposited in the magnet during the normal operations. Therefore, this thesis work aims at determining the heating power which can be extracted from the superconducting cables of the LHC, specially through their electrical insulation which represents the main thermal barrier. An experimental measurement campaign in superfluid helium bath was performed on several samples reproducting the main LHC magnets. The heating power was generated in the sample by Joule heating and the temperature increase was measured by means of Cernox bare chip and thermocouples. An innovative instrumentation technique which also includes the in-situ calibration of the thermocouples was developed. A thorough uncertainty analysis on the overall measurement chain concluded the experimental setup. The present study allowed to thermally characterize the main LHC magnets: Main Bending, Main Quadrupole and MQXA. The results show the thermal magnets behaviour as a function of bath temperature, heating configuration of the sample, sensor position and the hydrostatic helium pressure effect.CERN-THESIS-2014-248oai:cds.cern.ch:19880612015-02-10T07:13:07Z
spellingShingle Accelerators and Storage Rings
Engineering
Santandrea, Dario
Steady state heat transfer experimental studies of LHC superconducting cables operating in cryogenic environment of superfluid helium
title Steady state heat transfer experimental studies of LHC superconducting cables operating in cryogenic environment of superfluid helium
title_full Steady state heat transfer experimental studies of LHC superconducting cables operating in cryogenic environment of superfluid helium
title_fullStr Steady state heat transfer experimental studies of LHC superconducting cables operating in cryogenic environment of superfluid helium
title_full_unstemmed Steady state heat transfer experimental studies of LHC superconducting cables operating in cryogenic environment of superfluid helium
title_short Steady state heat transfer experimental studies of LHC superconducting cables operating in cryogenic environment of superfluid helium
title_sort steady state heat transfer experimental studies of lhc superconducting cables operating in cryogenic environment of superfluid helium
topic Accelerators and Storage Rings
Engineering
url http://cds.cern.ch/record/1988061
work_keys_str_mv AT santandreadario steadystateheattransferexperimentalstudiesoflhcsuperconductingcablesoperatingincryogenicenvironmentofsuperfluidhelium