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MD on UFOs at MKIs and MKQs
/ Baer, T (U. Hamburg (main)) ; Barnes, M (CERN) ; Bartmann, W (CERN) ; Bracco, C (CERN) ; Carlier, E (CERN) ; Dehning, B (CERN) ; Garrel, N ; Goddard, B (CERN) ; Jackson, S (CERN) ; Jimenez, M (DESY) et al.
UFOs ("Unidentified Falling Objects") are expected to be one of the major known performance limitation of the LHC. [...]
CERN-ATS-Note-2012-018 MD.
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2012.
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5.
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Analysis of fast losses in the LHC with the BLM system
/ Nebot, E (CERN) ; Velghe, B (CERN) ; Holzer, E (CERN) ; Dehning, B (CERN) ; Nordt, A (CERN) ; Sapinski, M (CERN) ; Emery, J (CERN) ; Zamantzas, C (CERN) ; Effinger, E (CERN) ; Marsili, A (CERN) et al.
About 3600 Ionization Chambers are located around the LHC ring to detect beam losses that could damage the equipment or quench superconducting magnets. The Beam Loss Monitors (BLMs) integrate the losses in 12 different time intervals (from 40 us to 83.8 s) allowing for different abort thresholds depending on the duration of the loss and the beam energy. [...]
CERN-ATS-2011-057.-
Geneva : CERN, 2011 - 3 p.
Fulltext: PDF; External link: Published version from JACoW
In : 2nd International Particle Accelerator Conference, San Sebastian, Spain, 4 - 9 Sep 2011, pp.TUPC136
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6.
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UFOs in the LHC
/ Baer, T (CERN ; Hamburg U.) ; Barnes, M (CERN) ; Goddard, B (CERN) ; Holzer, E B (CERN) ; Jimenez, J M (CERN) ; Lechner, V (CERN) ; Mertens, V (CERN) ; Nebot Del Busto, E (CERN) ; Nordt, A (CERN) ; Uythoven, J (CERN) et al.
One of the major known limitations for the performance of the Large Hadron Collider are so called UFOs (Unidentified Falling Objects). UFOs were first observed in July 2010 and caused numerous protection beam dumps since then. [...]
CERN-ATS-2011-276; CERN-ATS-2011-051.-
Geneva : CERN, 2011 - 4 p.
Fulltext: CERN-ATS-2011-276 - PDF; CERN-ATS-2011-051 - PDF; External link: Published version from JACoW
In : 2nd International Particle Accelerator Conference, San Sebastian, Spain, 4 - 9 Sep 2011, pp.TUPC137
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9.
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MKI UFOs at Injection
/ Baer, T (Hamburg U.) ; Barnes, M (CERN) ; Bartmann, W (CERN) ; Bracco, C (CERN) ; Carlier, E (CERN) ; Chanavat, C (CERN) ; Drosdal, L (U. Oslo (main)) ; Garrel, N ; Goddard, B (CERN) ; Kain, V (CERN) et al.
During the MD, the production mechanism of UFOs at the injection kicker magnets (MKIs) was studied. [...]
CERN-ATS-Note-2011-065 MD.
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2011. - 8 p.
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18.
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TECHNICAL COORDINATION
/ A. Ball ; W. Zeuner
1 Operational experience 2011 1.1 Overview Starting on a positive note, it is encouraging that, for the period of this report, the operation of CMS and its entire infrastructure at Point 5 was remarkably stable and efficient. No luminosity was lost due to failures of common systems or infrastructure [...]
CMSBUL-ARTICLE-2011-031.-
2011
- Published in : , no. 2/2011, pp. 2
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25.
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UFOs in the LHC: Observations, studies and extrapolations
/ Baer, T (CERN ; Hamburg U.) ; Barnes, MJ (CERN) ; Cerutti, F (CERN) ; Ferrari, A (CERN) ; Garrel, N (CERN) ; Goddard, B (CERN) ; Holzer, EB (CERN) ; Jackson, S (CERN) ; Lechner, A (CERN) ; Mertens, V (CERN) et al.
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 [...]
CERN-ATS-2012-100.-
Geneva : CERN, 2012 - 3 p.
- Published in : Conf. Proc.: C1205201 (2012) , pp. THPPP086
Fulltext: PDF; External link: Published version from JaCoW
In : 3rd International Particle Accelerator Conference, New Orleans, LA, USA, 20 - 25 May 2012, pp.3936
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26.
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Comparison of ejection events in the jet and accretion disc outflows in 3C 111
/ Tombesi, F (CRESST/NASA/GSFC ; University of Maryland, College Park) ; Sambruna, R M (George Mason University) ; Marscher, A P (Boston University) ; Jorstad, S G (Boston University ; St. Petersburg State University) ; Reynolds, C S (University of Maryland, College Park) ; Markowitz, A (University of California, San Diego ; Frederic-Alexander Universitat, Bamberg)
We present a comparison of the parameters of accretion disc outflows and the jet of the broad-line radio galaxy 3C 111 on sub-pc scales. [...]
arXiv:1205.1734.
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2012.
Preprint
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