Cargando…
Beam Induced Ferrite Heating of the LHC Injection Kickers and Proposals for Improved Cooling
The two LHC injection kicker systems produce an integrated field strength of 1.3 T·m with a flattop 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 each magnet, which consists of a ceramic tube with co...
Autores principales: | , , , , , , , , , , , |
---|---|
Lenguaje: | eng |
Publicado: |
2013
|
Materias: | |
Acceso en línea: | http://cds.cern.ch/record/1574588 |
_version_ | 1780931049008660480 |
---|---|
author | Barnes, M J Caspers, F Calatroni, S Day, H Ducimetière, L Garlaschè, M Gomes Namora, V Mertens, V Sobiech, Z Taborelli, M Uythoven, J Weterings, W |
author_facet | Barnes, M J Caspers, F Calatroni, S Day, H Ducimetière, L Garlaschè, M Gomes Namora, V Mertens, V Sobiech, Z Taborelli, M Uythoven, J Weterings, W |
author_sort | Barnes, M J |
collection | CERN |
description | The two LHC injection kicker systems produce an integrated field strength of 1.3 T·m with a flattop 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 each magnet, which consists of a ceramic tube with conductors in the inner wall. The conductors provide a path for the beam image current and screen the ferrite yoke against wakefields. Recent LHC operation, with high intensity beam stable for many hours, resulted in significant heating of both the ferrite yoke and beam impedance reduction ferrites. For one kicker magnet the ferrite yoke approached its Curie temperature. As a result of a long thermal time-constant the ferrite yoke can require several hours to cool sufficiently to allow re-injection of beam, thus limiting the running efficiency of the LHC. Thermal measurement data has been analysed, a thermal model developed and emissivity measurements carried out. Various measures to improve the ferrite cooling have been simulated, including an improved emissivity of the vacuum tank and active cooling on the outside of the tank. |
id | cern-1574588 |
institution | Organización Europea para la Investigación Nuclear |
language | eng |
publishDate | 2013 |
record_format | invenio |
spelling | cern-15745882019-09-30T06:29:59Zhttp://cds.cern.ch/record/1574588engBarnes, M JCaspers, FCalatroni, SDay, HDucimetière, LGarlaschè, MGomes Namora, VMertens, VSobiech, ZTaborelli, MUythoven, JWeterings, WBeam Induced Ferrite Heating of the LHC Injection Kickers and Proposals for Improved CoolingAccelerators and Storage RingsThe two LHC injection kicker systems produce an integrated field strength of 1.3 T·m with a flattop 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 each magnet, which consists of a ceramic tube with conductors in the inner wall. The conductors provide a path for the beam image current and screen the ferrite yoke against wakefields. Recent LHC operation, with high intensity beam stable for many hours, resulted in significant heating of both the ferrite yoke and beam impedance reduction ferrites. For one kicker magnet the ferrite yoke approached its Curie temperature. As a result of a long thermal time-constant the ferrite yoke can require several hours to cool sufficiently to allow re-injection of beam, thus limiting the running efficiency of the LHC. Thermal measurement data has been analysed, a thermal model developed and emissivity measurements carried out. Various measures to improve the ferrite cooling have been simulated, including an improved emissivity of the vacuum tank and active cooling on the outside of the tank.CERN-ACC-2013-0073oai:cds.cern.ch:15745882013-07-31 |
spellingShingle | Accelerators and Storage Rings Barnes, M J Caspers, F Calatroni, S Day, H Ducimetière, L Garlaschè, M Gomes Namora, V Mertens, V Sobiech, Z Taborelli, M Uythoven, J Weterings, W Beam Induced Ferrite Heating of the LHC Injection Kickers and Proposals for Improved Cooling |
title | Beam Induced Ferrite Heating of the LHC Injection Kickers and Proposals for Improved Cooling |
title_full | Beam Induced Ferrite Heating of the LHC Injection Kickers and Proposals for Improved Cooling |
title_fullStr | Beam Induced Ferrite Heating of the LHC Injection Kickers and Proposals for Improved Cooling |
title_full_unstemmed | Beam Induced Ferrite Heating of the LHC Injection Kickers and Proposals for Improved Cooling |
title_short | Beam Induced Ferrite Heating of the LHC Injection Kickers and Proposals for Improved Cooling |
title_sort | beam induced ferrite heating of the lhc injection kickers and proposals for improved cooling |
topic | Accelerators and Storage Rings |
url | http://cds.cern.ch/record/1574588 |
work_keys_str_mv | AT barnesmj beaminducedferriteheatingofthelhcinjectionkickersandproposalsforimprovedcooling AT caspersf beaminducedferriteheatingofthelhcinjectionkickersandproposalsforimprovedcooling AT calatronis beaminducedferriteheatingofthelhcinjectionkickersandproposalsforimprovedcooling AT dayh beaminducedferriteheatingofthelhcinjectionkickersandproposalsforimprovedcooling AT ducimetierel beaminducedferriteheatingofthelhcinjectionkickersandproposalsforimprovedcooling AT garlaschem beaminducedferriteheatingofthelhcinjectionkickersandproposalsforimprovedcooling AT gomesnamorav beaminducedferriteheatingofthelhcinjectionkickersandproposalsforimprovedcooling AT mertensv beaminducedferriteheatingofthelhcinjectionkickersandproposalsforimprovedcooling AT sobiechz beaminducedferriteheatingofthelhcinjectionkickersandproposalsforimprovedcooling AT taborellim beaminducedferriteheatingofthelhcinjectionkickersandproposalsforimprovedcooling AT uythovenj beaminducedferriteheatingofthelhcinjectionkickersandproposalsforimprovedcooling AT weteringsw beaminducedferriteheatingofthelhcinjectionkickersandproposalsforimprovedcooling |