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1.
Lifetime Analysis at High Intensity Colliders Applied to the LHC / Salvachua, B (CERN) ; Assmann, RW (CERN) ; Bruce, R (CERN) ; Burkart, F (CERN) ; Redaelli, S (CERN) ; Valentino, G (CERN) ; Wollmann, D (CERN)
The beam lifetime is one of the main parameters to define the performance of a collider. In a super-conducting machine like the LHC, the lifetime determines the intensity reach for a given collimation cleaning. [...]
CERN-ACC-2013-0072.- Geneva : CERN, 2013 - 3 p. Fulltext: PDF;
In : 4th International Particle Accelerator Conference, Shanghai, China, 12 - 17 May 2013, pp.1005
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2.
Cleaning Performance of the LHC Collimation System up to 4 Tev / Salvachua, B (CERN) ; Assmann, RW (CERN) ; Bruce, R (CERN) ; Deboy, D (CERN) ; Marsili, A (CERN) ; Quaranta, E (CERN) ; Redaelli, S (CERN) ; Rossi, A (CERN) ; Mirarchi, D (CERN) ; Valentino, G (Malta U. ; CERN) et al.
In this paper we review the performance of the LHC collimation system during 2012 and compare it with previous years. During 2012, the so-called tight settings were deployed for a better cleaning and improved _⋆ reach. [...]
CERN-ACC-2013-0070.- Geneva : CERN, 2013 - 3 p. Fulltext: PDF;
In : 4th International Particle Accelerator Conference, Shanghai, China, 12 - 17 May 2013, pp.1002
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3.
Remote Estimation of Collimator Jaw Damages With Sounds Measurements During Beam Impacts / Deboy, D (CERN) ; Assmann, RW (CERN) ; Aberle, O (CERN) ; Carra, F (CERN) ; Cauchi, M (CERN) ; Lendaro, J (CERN) ; Masi, A (CERN) ; Redaelli, S (CERN)
Irregular hits of high-intensity LHC beams on collimators can lead to severe damage of the collimator jaws. The identification of damaged collimator jaws by observation of beam measurements is challenging: online loss measurements at the moment of the impacts can be tricky and degradation of the overall performance from single collimator damage can be difficult to measure. [...]
CERN-ACC-2013-0061.- Geneva : CERN, 2013 - 3 p. Fulltext: PDF;
In : 4th International Particle Accelerator Conference, Shanghai, China, 12 - 17 May 2013, pp.951
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4.
Results on nominal collimator settings MD at 4 TeV / Salvachua, B (CERN) ; Assmann, RW (CERN) ; Burov, A (CERN) ; Bruce, R (CERN) ; Cauchi, M (CERN) ; Deboy, D (CERN) ; Lari, L (CERN) ; Marsili, A (CERN) ; Metral, E (CERN) ; Mounet, N (CERN) et al.
The goal of the MD performed on June 24th 2012 was to achieve the nominal 7 TeV settings in mm with nominal single bunch intensities using centers from the beam-based alignment of March 2012. [...]
CERN-ATS-Note-2012-092 MD. - 2012.
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5.
Halo Scraping, Diffusion and Repopulation MD / Valentino, G (CERN) ; Assmann, RW (CERN) ; Bruce, R (CERN) ; Burkart, F (CERN) ; Redaelli, F (CERN) ; Salvachua, B (CERN) ; Previtali, V (Fermilab) ; Stancari, G (Fermilab) ; Valishev, A (Fermilab)
Beam halo measurements in the LHC were conducted through collimator scrapings in an MD carried out on the 22nd June 2012 for the first time at 4 TeV. [...]
CERN-ATS-Note-2012-074 MD. - 2012.
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6.
IR2 aperture measurements at 3.5 TeV / Alabau Pons, C (Universidad de Valencia, Consejo Superior de Investigaciones Cientificas) ; Arduini, A (CERN) ; Assmann, RW (CERN) ; Bruce, R (CERN) ; Giovannozzi, M (CERN) ; Jowett, J M (CERN) ; MacLean, E (University of Oxford, Particle Physics) ; Muller, G ; Redaelli, S (CERN) ; Tomas, R (CERN) et al.
Aperture measurements in the ALICE interaction region were carried out to determine a safe configuration of beta* and crossing angle for the 2011 heavy ion run [...]
CERN-ATS-Note-2012-017 MD. - 2012. - 10 p.
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7.
Tight collimator settings with beta* = 1.0 m / Assmann, RW (CERN) ; Bruce, R (CERN) ; Burkart, F (CERN) ; Cauchi, M (CERN) ; Deboy, D (CERN) ; Lari, L (CERN) ; Redaelli, S (CERN) ; Rossi, A (CERN) ; Valentino, G (CERN) ; Wollmann, D (CERN)
In this MD we have driven all collimators from relaxed settings, used routinely during the 2011 operation, to tight settings (primary collimator at 4 nominal sigma) during the ramp and squeezed to beta* = 1.0 m. [...]
CERN-ATS-Note-2011-079 MD. - 2011. - 3 p.
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8.
Beam distribution measurements in the LHC / Assmann, RW (CERN) ; Bruce, R (CERN) ; Burkart, F (CERN) ; Cauchi, M (CERN) ; Deboy, D (CERN) ; Lari, L (CERN) ; Redaelli, S (CERN) ; Rossi, A (CERN) ; Valentino, G (CERN) ; Wollmann, D (CERN)
Understanding the population and shape of the beam halo is important to predict possible intensity limitations due to collimation at $\unit[7]{TeV}$. [...]
CERN-ATS-Note-2011-057 MD. - 2011.
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9.
Collimator losses in the DS of IR7 and quench test at 3.5~TeV / Assmann, RW (CERN) ; Bruce, R (CERN) ; Burkart, F (CERN) ; Cauchi, M (CERN) ; Deboy, D (CERN) ; Dehning, B (CERN) ; Holzer, EB (CERN) ; Nebot del Busto, E (CERN) ; Priebe, A (CERN) ; Redaelli, S (CERN) et al.
Beam studies to address the limitations of the Phase~I collimation system were performed. [...]
CERN-ATS-Note-2011-042 MD. - 2011.
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