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Consequences of warm-up of a sector above 80K

There may be circumstances when a sector has to be partially or totally warmed-up to temperatures above 80 K, that is when thermal dilatation starts to play a role. Some equipment have been identify as presenting a risk, like the non-conform "plug-in" modules in the arcs. Because of motion...

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Autor principal: Strubin, P
Lenguaje:eng
Publicado: 2009
Materias:
Acceso en línea:http://cds.cern.ch/record/1172407
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author Strubin, P
author_facet Strubin, P
author_sort Strubin, P
collection CERN
description There may be circumstances when a sector has to be partially or totally warmed-up to temperatures above 80 K, that is when thermal dilatation starts to play a role. Some equipment have been identify as presenting a risk, like the non-conform "plug-in" modules in the arcs. Because of motion induced by thermal dilatation, the electrical (ElQA) quality control may also have to be done again after cool-down. The main reason identified so far for partial warm-up is the required maintenance of the cooling towers and the cryogenics plants. There is also the request from the vacuum group to periodically warm-up the beam screen to temperatures in the 100 K region to release and pump-out the gas crysorbed on the surface of the beam screen. Observed and expected temperature conditions and statistics on failures of PIMs in sectors which have been warmed-up will be presented in this contribution. Methods to detect buckled PIMs will be described, as well as a recommended strategy for consolidation. Finally, the required electrical quality controls will also be described.
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institution Organización Europea para la Investigación Nuclear
language eng
publishDate 2009
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spelling cern-11724072019-09-30T06:29:59Zhttp://cds.cern.ch/record/1172407engStrubin, PConsequences of warm-up of a sector above 80KAccelerators and Storage RingsThere may be circumstances when a sector has to be partially or totally warmed-up to temperatures above 80 K, that is when thermal dilatation starts to play a role. Some equipment have been identify as presenting a risk, like the non-conform "plug-in" modules in the arcs. Because of motion induced by thermal dilatation, the electrical (ElQA) quality control may also have to be done again after cool-down. The main reason identified so far for partial warm-up is the required maintenance of the cooling towers and the cryogenics plants. There is also the request from the vacuum group to periodically warm-up the beam screen to temperatures in the 100 K region to release and pump-out the gas crysorbed on the surface of the beam screen. Observed and expected temperature conditions and statistics on failures of PIMs in sectors which have been warmed-up will be presented in this contribution. Methods to detect buckled PIMs will be described, as well as a recommended strategy for consolidation. Finally, the required electrical quality controls will also be described.oai:cds.cern.ch:11724072009
spellingShingle Accelerators and Storage Rings
Strubin, P
Consequences of warm-up of a sector above 80K
title Consequences of warm-up of a sector above 80K
title_full Consequences of warm-up of a sector above 80K
title_fullStr Consequences of warm-up of a sector above 80K
title_full_unstemmed Consequences of warm-up of a sector above 80K
title_short Consequences of warm-up of a sector above 80K
title_sort consequences of warm-up of a sector above 80k
topic Accelerators and Storage Rings
url http://cds.cern.ch/record/1172407
work_keys_str_mv AT strubinp consequencesofwarmupofasectorabove80k