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Cooling of the LHC Injection Kicker Magnet Ferrite Yoke: Measurements and Future Proposals

LHC operation with high intensity beam, stable for many hours, resulted in significant heating of the ferrite yoke of the LHC Injection Kicker Magnets. For one kicker magnet the ferrite yoke approached its Curie temperature. As a result of a long thermal time-constant the yoke can require several ho...

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Autores principales: Sobiech, Z, Barnes, MJ, Bouleghlimat, S, Ducimetière, L, Garlaschè, M, Kramer, T, Namora, V, Noulibos, R, Sillanoli, Y, Weterings, W
Lenguaje:eng
Publicado: 2014
Materias:
Acceso en línea:http://cds.cern.ch/record/1966019
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author Sobiech, Z
Barnes, MJ
Bouleghlimat, S
Ducimetière, L
Garlaschè, M
Kramer, T
Namora, V
Noulibos, R
Sillanoli, Y
Weterings, W
author_facet Sobiech, Z
Barnes, MJ
Bouleghlimat, S
Ducimetière, L
Garlaschè, M
Kramer, T
Namora, V
Noulibos, R
Sillanoli, Y
Weterings, W
author_sort Sobiech, Z
collection CERN
description LHC operation with high intensity beam, stable for many hours, resulted in significant heating of the ferrite yoke of the LHC Injection Kicker Magnets. For one kicker magnet the ferrite yoke approached its Curie temperature. As a result of a long thermal time-constant the yoke can require several hours to cool sufficiently to allow re-injection of beam, thus limiting the running efficiency of the LHC. The beam screen, which screens the ferrite yoke from wakefields, has been upgraded to limit ferrite heating. In addition it is important to improve the cooling of the ferrite yoke: one method is to increase the internal emissivity of the cylindrical vacuum tank, in which the kicker magnet is installed. This paper describes a method developed for measuring the emissivity of the inside of the tanks, which has been benchmarked against measurements of the ferrite yoke temperature during heat treatment in an oven and transient thermal simulations. Conclusions are drawn regarding an ion bombardment technique evaluated for improving emissivity without degrading vacuum properties. In addition initial concepts for improved cooling are presented.
id cern-1966019
institution Organización Europea para la Investigación Nuclear
language eng
publishDate 2014
record_format invenio
spelling cern-19660192022-08-17T13:33:05Zhttp://cds.cern.ch/record/1966019engSobiech, ZBarnes, MJBouleghlimat, SDucimetière, LGarlaschè, MKramer, TNamora, VNoulibos, RSillanoli, YWeterings, WCooling of the LHC Injection Kicker Magnet Ferrite Yoke: Measurements and Future ProposalsAccelerators and Storage RingsLHC operation with high intensity beam, stable for many hours, resulted in significant heating of the ferrite yoke of the LHC Injection Kicker Magnets. For one kicker magnet the ferrite yoke approached its Curie temperature. As a result of a long thermal time-constant the yoke can require several hours to cool sufficiently to allow re-injection of beam, thus limiting the running efficiency of the LHC. The beam screen, which screens the ferrite yoke from wakefields, has been upgraded to limit ferrite heating. In addition it is important to improve the cooling of the ferrite yoke: one method is to increase the internal emissivity of the cylindrical vacuum tank, in which the kicker magnet is installed. This paper describes a method developed for measuring the emissivity of the inside of the tanks, which has been benchmarked against measurements of the ferrite yoke temperature during heat treatment in an oven and transient thermal simulations. Conclusions are drawn regarding an ion bombardment technique evaluated for improving emissivity without degrading vacuum properties. In addition initial concepts for improved cooling are presented.CERN-ACC-2014-0241oai:cds.cern.ch:19660192014-10-30
spellingShingle Accelerators and Storage Rings
Sobiech, Z
Barnes, MJ
Bouleghlimat, S
Ducimetière, L
Garlaschè, M
Kramer, T
Namora, V
Noulibos, R
Sillanoli, Y
Weterings, W
Cooling of the LHC Injection Kicker Magnet Ferrite Yoke: Measurements and Future Proposals
title Cooling of the LHC Injection Kicker Magnet Ferrite Yoke: Measurements and Future Proposals
title_full Cooling of the LHC Injection Kicker Magnet Ferrite Yoke: Measurements and Future Proposals
title_fullStr Cooling of the LHC Injection Kicker Magnet Ferrite Yoke: Measurements and Future Proposals
title_full_unstemmed Cooling of the LHC Injection Kicker Magnet Ferrite Yoke: Measurements and Future Proposals
title_short Cooling of the LHC Injection Kicker Magnet Ferrite Yoke: Measurements and Future Proposals
title_sort cooling of the lhc injection kicker magnet ferrite yoke: measurements and future proposals
topic Accelerators and Storage Rings
url http://cds.cern.ch/record/1966019
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