UFOs in the LHC after LS1

UFOs (Unidentified Falling Objects) are potentially a major luminosity limitation for nominal LHC operation. With large-scale increases of the BLM thresholds, their impact on LHC availability was mitigated in the second half of 2011. For higher beam energy and lower magnet quench limits, the problem...

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Detalles Bibliográficos
Autores principales: Baer, T, Barnes, M J, Carlier, E, Cerutti, F, Dehning, B, Ducimetière, L, Ferrari, A, Garrel, N, Gérardin, A, Goddard, B, Holzer, E B, Jackson, S, Jimenez, J M, Kain, V, Lechner, A, Mertens, V, Misiowiec, M, Morón Ballester, R, Nebot del Busto, E, Norderhaug Drosdal, L, Nordt, A, Uythoven, J, Velghe, B, Vlachoudis, V, Wenninger, J, Zamantzas, C, Zimmermann, F, Fuster Martinez, N
Lenguaje:eng
Publicado: CERN 2012
Materias:
Accelerators and Storage Rings
Acceso en línea:https://dx.doi.org/10.5170/CERN-2012-006.294
http://cds.cern.ch/record/1493018
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author Baer, T
Barnes, M J
Carlier, E
Cerutti, F
Dehning, B
Ducimetière, L
Ferrari, A
Garrel, N
Gérardin, A
Goddard, B
Holzer, E B
Jackson, S
Jimenez, J M
Kain, V
Lechner, A
Mertens, V
Misiowiec, M
Morón Ballester, R
Nebot del Busto, E
Norderhaug Drosdal, L
Nordt, A
Uythoven, J
Velghe, B
Vlachoudis, V
Wenninger, J
Zamantzas, C
Zimmermann, F
Fuster Martinez, N
author_facet Baer, T
Barnes, M J
Carlier, E
Cerutti, F
Dehning, B
Ducimetière, L
Ferrari, A
Garrel, N
Gérardin, A
Goddard, B
Holzer, E B
Jackson, S
Jimenez, J M
Kain, V
Lechner, A
Mertens, V
Misiowiec, M
Morón Ballester, R
Nebot del Busto, E
Norderhaug Drosdal, L
Nordt, A
Uythoven, J
Velghe, B
Vlachoudis, V
Wenninger, J
Zamantzas, C
Zimmermann, F
Fuster Martinez, N
author_sort Baer, T
collection CERN
description UFOs (Unidentified Falling Objects) are potentially a major luminosity limitation for nominal LHC operation. With large-scale increases of the BLM thresholds, their impact on LHC availability was mitigated in the second half of 2011. For higher beam energy and lower magnet quench limits, the problem is expected to be considerably worse, though. Therefore, in 2011, 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. In this paper, the state of knowledge is summarized and extrapolations for LHC operation after LS1 are presented. Mitigation strategies are proposed and related tests and measures for 2012 are specified.
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institution Organización Europea para la Investigación Nuclear
language eng
publishDate 2012
publisher CERN
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spelling cern-14930182022-08-10T20:41:33Zdoi:10.5170/CERN-2012-006.294http://cds.cern.ch/record/1493018engBaer, TBarnes, M JCarlier, ECerutti, FDehning, BDucimetière, LFerrari, AGarrel, NGérardin, AGoddard, BHolzer, E BJackson, SJimenez, J MKain, VLechner, AMertens, VMisiowiec, MMorón Ballester, RNebot del Busto, ENorderhaug Drosdal, LNordt, AUythoven, JVelghe, BVlachoudis, VWenninger, JZamantzas, CZimmermann, FFuster Martinez, NUFOs in the LHC after LS1Accelerators and Storage RingsUFOs (Unidentified Falling Objects) are potentially a major luminosity limitation for nominal LHC operation. With large-scale increases of the BLM thresholds, their impact on LHC availability was mitigated in the second half of 2011. For higher beam energy and lower magnet quench limits, the problem is expected to be considerably worse, though. Therefore, in 2011, 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. In this paper, the state of knowledge is summarized and extrapolations for LHC operation after LS1 are presented. Mitigation strategies are proposed and related tests and measures for 2012 are specified.CERNoai:cds.cern.ch:14930182012
spellingShingle Accelerators and Storage Rings
Baer, T
Barnes, M J
Carlier, E
Cerutti, F
Dehning, B
Ducimetière, L
Ferrari, A
Garrel, N
Gérardin, A
Goddard, B
Holzer, E B
Jackson, S
Jimenez, J M
Kain, V
Lechner, A
Mertens, V
Misiowiec, M
Morón Ballester, R
Nebot del Busto, E
Norderhaug Drosdal, L
Nordt, A
Uythoven, J
Velghe, B
Vlachoudis, V
Wenninger, J
Zamantzas, C
Zimmermann, F
Fuster Martinez, N
UFOs in the LHC after LS1
title UFOs in the LHC after LS1
title_full UFOs in the LHC after LS1
title_fullStr UFOs in the LHC after LS1
title_full_unstemmed UFOs in the LHC after LS1
title_short UFOs in the LHC after LS1
title_sort ufos in the lhc after ls1
topic Accelerators and Storage Rings
url https://dx.doi.org/10.5170/CERN-2012-006.294
http://cds.cern.ch/record/1493018
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