UFOs in the LHC: Observations, studies and extrapolations

Unidentified falling objects (UFOs) are potentially a major luminosity limitation for nominal LHC operation. They are presumably micrometer sized dust particles which lead to fast beam losses when they interact with the beam. With large-scale increases and optimizations of the beam loss monitor (BLM...

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Detalles Bibliográficos
Autores principales: Baer, T, Barnes, MJ, Cerutti, F, Ferrari, A, Garrel, N, Goddard, B, Holzer, EB, Jackson, S, Lechner, A, Mertens, V, Misiowiec, M, Nebot del Busto, E, Nordt, A, Uythoven, J, Vlachoudis, V, Wenninger, J, Zamantzas, C, Zimmermann, F, Fuster, N
Lenguaje:eng
Publicado: 2012
Materias:
Accelerators and Storage Rings
Acceso en línea:http://cds.cern.ch/record/1459446
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author Baer, T
Barnes, MJ
Cerutti, F
Ferrari, A
Garrel, N
Goddard, B
Holzer, EB
Jackson, S
Lechner, A
Mertens, V
Misiowiec, M
Nebot del Busto, E
Nordt, A
Uythoven, J
Vlachoudis, V
Wenninger, J
Zamantzas, C
Zimmermann, F
Fuster, N
author_facet Baer, T
Barnes, MJ
Cerutti, F
Ferrari, A
Garrel, N
Goddard, B
Holzer, EB
Jackson, S
Lechner, A
Mertens, V
Misiowiec, M
Nebot del Busto, E
Nordt, A
Uythoven, J
Vlachoudis, V
Wenninger, J
Zamantzas, C
Zimmermann, F
Fuster, N
author_sort Baer, T
collection CERN
description Unidentified falling objects (UFOs) are potentially a major luminosity limitation for nominal LHC operation. They are presumably micrometer sized dust particles which lead to fast beam losses when they interact with the beam. With large-scale increases and optimizations of the beam loss monitor (BLM) thresholds, their impact on LHC availability was mitigated from mid 2011 onwards. For higher beam energy and lower magnet quench limits, the problem is expected to be considerably worse, though. In 2011/12, the diagnostics for UFO events were significantly improved: dedicated experiments and measurements in the LHC and in the laboratory were made and complemented by FLUKA simulations and theoretical studies. The state of knowledge, extrapolations for nominal LHC operation and mitigation strategies are presented
id cern-1459446
institution Organización Europea para la Investigación Nuclear
language eng
publishDate 2012
record_format invenio
spelling cern-14594462022-08-17T13:25:24Zhttp://cds.cern.ch/record/1459446engBaer, TBarnes, MJCerutti, FFerrari, AGarrel, NGoddard, BHolzer, EBJackson, SLechner, AMertens, VMisiowiec, MNebot del Busto, ENordt, AUythoven, JVlachoudis, VWenninger, JZamantzas, CZimmermann, FFuster, NUFOs in the LHC: Observations, studies and extrapolationsAccelerators and Storage RingsUnidentified falling objects (UFOs) are potentially a major luminosity limitation for nominal LHC operation. They are presumably micrometer sized dust particles which lead to fast beam losses when they interact with the beam. With large-scale increases and optimizations of the beam loss monitor (BLM) thresholds, their impact on LHC availability was mitigated from mid 2011 onwards. For higher beam energy and lower magnet quench limits, the problem is expected to be considerably worse, though. In 2011/12, the diagnostics for UFO events were significantly improved: dedicated experiments and measurements in the LHC and in the laboratory were made and complemented by FLUKA simulations and theoretical studies. The state of knowledge, extrapolations for nominal LHC operation and mitigation strategies are presentedCERN-ATS-2012-100oai:cds.cern.ch:14594462012-05-20
spellingShingle Accelerators and Storage Rings
Baer, T
Barnes, MJ
Cerutti, F
Ferrari, A
Garrel, N
Goddard, B
Holzer, EB
Jackson, S
Lechner, A
Mertens, V
Misiowiec, M
Nebot del Busto, E
Nordt, A
Uythoven, J
Vlachoudis, V
Wenninger, J
Zamantzas, C
Zimmermann, F
Fuster, N
UFOs in the LHC: Observations, studies and extrapolations
title UFOs in the LHC: Observations, studies and extrapolations
title_full UFOs in the LHC: Observations, studies and extrapolations
title_fullStr UFOs in the LHC: Observations, studies and extrapolations
title_full_unstemmed UFOs in the LHC: Observations, studies and extrapolations
title_short UFOs in the LHC: Observations, studies and extrapolations
title_sort ufos in the lhc: observations, studies and extrapolations
topic Accelerators and Storage Rings
url http://cds.cern.ch/record/1459446
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