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Analysis of ferrite heating of the LHC injection kickers and proposals for future reduction of temperature

The two LHC injection kicker magnet (MKI) systems must produce a kick of 1.3 T.m with a flat top duration variable up to 7860 ns, and rise and fall times of less than 900 ns and 3000 ns, respectively. A beam screen is placed in the aperture of the magnets: the screen consists of a ceramic tube with...

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Detalles Bibliográficos
Autores principales: Barnes, M J, Ducimetière, L, Garrel, N, Goddard, B, Mertens, V, Weterings, W
Lenguaje:eng
Publicado: 2012
Materias:
Acceso en línea:http://cds.cern.ch/record/1470559
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author Barnes, M J
Ducimetière, L
Garrel, N
Goddard, B
Mertens, V
Weterings, W
author_facet Barnes, M J
Ducimetière, L
Garrel, N
Goddard, B
Mertens, V
Weterings, W
author_sort Barnes, M J
collection CERN
description The two LHC injection kicker magnet (MKI) systems must produce a kick of 1.3 T.m with a flat top duration variable up to 7860 ns, and rise and fall times of less than 900 ns and 3000 ns, respectively. A beam screen is placed in the aperture of the magnets: the screen consists of a ceramic tube with conductors on the inner wall. The conductors provide a path for the image current of the high intensity LHC beam and screen the ferrite against wake fields. The conductors initially used gave adequately low beam coupling impedance however screen conductor discharges occurred during pulsing of the magnet; hence an alternative design with fewer screen conductors was implemented to meet the often conflicting requirements for low beam coupling impedance, fast magnetic field rise-time and good high voltage behaviour. During 2011 the LHC was operated with high intensity beam, coasting for many hours at a time, resulting in heating of the ferrite yoke of the MKIs. This paper presents an analysis of thermal measurement data and an extrapolation of the heating for future operation; in addition means are discussed for reducing ferrite heating and improving cooling.
id cern-1470559
institution Organización Europea para la Investigación Nuclear
language eng
publishDate 2012
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spelling cern-14705592022-08-17T13:30:29Zhttp://cds.cern.ch/record/1470559engBarnes, M JDucimetière, LGarrel, NGoddard, BMertens, VWeterings, WAnalysis of ferrite heating of the LHC injection kickers and proposals for future reduction of temperatureAccelerators and Storage RingsThe two LHC injection kicker magnet (MKI) systems must produce a kick of 1.3 T.m with a flat top duration variable up to 7860 ns, and rise and fall times of less than 900 ns and 3000 ns, respectively. A beam screen is placed in the aperture of the magnets: the screen consists of a ceramic tube with conductors on the inner wall. The conductors provide a path for the image current of the high intensity LHC beam and screen the ferrite against wake fields. The conductors initially used gave adequately low beam coupling impedance however screen conductor discharges occurred during pulsing of the magnet; hence an alternative design with fewer screen conductors was implemented to meet the often conflicting requirements for low beam coupling impedance, fast magnetic field rise-time and good high voltage behaviour. During 2011 the LHC was operated with high intensity beam, coasting for many hours at a time, resulting in heating of the ferrite yoke of the MKIs. This paper presents an analysis of thermal measurement data and an extrapolation of the heating for future operation; in addition means are discussed for reducing ferrite heating and improving cooling.CERN-ATS-2012-211oai:cds.cern.ch:14705592012-08-01
spellingShingle Accelerators and Storage Rings
Barnes, M J
Ducimetière, L
Garrel, N
Goddard, B
Mertens, V
Weterings, W
Analysis of ferrite heating of the LHC injection kickers and proposals for future reduction of temperature
title Analysis of ferrite heating of the LHC injection kickers and proposals for future reduction of temperature
title_full Analysis of ferrite heating of the LHC injection kickers and proposals for future reduction of temperature
title_fullStr Analysis of ferrite heating of the LHC injection kickers and proposals for future reduction of temperature
title_full_unstemmed Analysis of ferrite heating of the LHC injection kickers and proposals for future reduction of temperature
title_short Analysis of ferrite heating of the LHC injection kickers and proposals for future reduction of temperature
title_sort analysis of ferrite heating of the lhc injection kickers and proposals for future reduction of temperature
topic Accelerators and Storage Rings
url http://cds.cern.ch/record/1470559
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