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Bench measurements of the LHC injection kicker low frequency impedance properties

The LHC injection kicker contains a ceramic tube with inside printed metallic strips as a RF bypass in order to minimise the beam coupling impedance. These strips are capacitively coupled at one side to avoid eddy current during kicker transients. Experimentally it was found already earlier, using b...

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Detalles Bibliográficos
Autores principales: Caspers, Friedhelm, Mostacci, A
Lenguaje:eng
Publicado: 2002
Materias:
Acceso en línea:http://cds.cern.ch/record/702710
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author Caspers, Friedhelm
Mostacci, A
author_facet Caspers, Friedhelm
Mostacci, A
author_sort Caspers, Friedhelm
collection CERN
description The LHC injection kicker contains a ceramic tube with inside printed metallic strips as a RF bypass in order to minimise the beam coupling impedance. These strips are capacitively coupled at one side to avoid eddy current during kicker transients. Experimentally it was found already earlier, using bench techniques, that in the region between 10 and 30 MHz certain resonances and thus peaks in the coupling impedance occur, related to the transition of the image current from the “cold conductor" to the bypass strips. The presence of these resonances has been reconfirmed as well as their properties. A practical method for reducing their influence by attaching lossy ferrite rings to the ends of the ceramic pipe is proposed and has partly been tested. As the present measurements were done on a mock-up for this RF bypass, which has limited validity towards higher frequencies, a full scale test should be repeated, once the first prototype of the 3 meter long ceramic chamber with printed bypass strips is available.
id cern-702710
institution Organización Europea para la Investigación Nuclear
language eng
publishDate 2002
record_format invenio
spelling cern-7027102023-08-16T09:16:42Zhttp://cds.cern.ch/record/702710engCaspers, FriedhelmMostacci, ABench measurements of the LHC injection kicker low frequency impedance propertiesAccelerators and Storage RingsThe LHC injection kicker contains a ceramic tube with inside printed metallic strips as a RF bypass in order to minimise the beam coupling impedance. These strips are capacitively coupled at one side to avoid eddy current during kicker transients. Experimentally it was found already earlier, using bench techniques, that in the region between 10 and 30 MHz certain resonances and thus peaks in the coupling impedance occur, related to the transition of the image current from the “cold conductor" to the bypass strips. The presence of these resonances has been reconfirmed as well as their properties. A practical method for reducing their influence by attaching lossy ferrite rings to the ends of the ceramic pipe is proposed and has partly been tested. As the present measurements were done on a mock-up for this RF bypass, which has limited validity towards higher frequencies, a full scale test should be repeated, once the first prototype of the 3 meter long ceramic chamber with printed bypass strips is available.SL-Note-2002-030-APoai:cds.cern.ch:7027102002-10-01
spellingShingle Accelerators and Storage Rings
Caspers, Friedhelm
Mostacci, A
Bench measurements of the LHC injection kicker low frequency impedance properties
title Bench measurements of the LHC injection kicker low frequency impedance properties
title_full Bench measurements of the LHC injection kicker low frequency impedance properties
title_fullStr Bench measurements of the LHC injection kicker low frequency impedance properties
title_full_unstemmed Bench measurements of the LHC injection kicker low frequency impedance properties
title_short Bench measurements of the LHC injection kicker low frequency impedance properties
title_sort bench measurements of the lhc injection kicker low frequency impedance properties
topic Accelerators and Storage Rings
url http://cds.cern.ch/record/702710
work_keys_str_mv AT caspersfriedhelm benchmeasurementsofthelhcinjectionkickerlowfrequencyimpedanceproperties
AT mostaccia benchmeasurementsofthelhcinjectionkickerlowfrequencyimpedanceproperties