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1.
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LHC collimation cleaning and operation outlook
/ Salvachua, B (CERN) ; Assmann, R W (CERN) ; Bruce, R (CERN) ; Cauchi, M (CERN) ; Deboy, D (CERN) ; Lari, L (CERN) ; Marsili, A (CERN) ; Mirarchi, D (CERN) ; Quaranta, E (CERN) ; Redaelli, S (CERN) et al.
An overview of the collimation system performance during 2012 is described. The collimator " tight " settings for the 60 cm β reach are introduced and the evolution of the cleaning inefficiency achieved throughout the year with one single collimator alignment is presented. [...]
Geneva : CERN, 2012 - 6 p.
- Published in : (2012) , pp. 155-160
Fulltext: PDF;
In : 4th Evian Workshop on LHC beam operation, Evian-les-Bains, France, 17 - 20 Dec 2012, pp.155-160
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2.
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Thermomechanical assessment of the effects of a jaw-beam angle during beam impact on Large Hadron Collider collimators
/ Cauchi, Marija (CERN ; Malta U.) ; Assmann, R W (CERN) ; Bertarelli, A (CERN) ; Carra, F (CERN) ; Lari, L (CERN) ; Rossi, A (CERN) ; Mollicone, P (Malta U.) ; Sammut, N (Malta U.)
The correct functioning of a collimation system is crucial to safely and successfully operate high-energy particle accelerators, such as the Large Hadron Collider (LHC). However, the requirements to handle high-intensity beams can be demanding, and accident scenarios must be well studied in order to assess if the collimator design is robust against possible error scenarios. [...]
2015 - 14 p.
- Published in : Phys. Rev. Spec. Top. Accel. Beams 18 (2015) 021001
APS Open Access article: PDF;
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3.
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4.
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High energy beam impact tests on a LHC tertiary collimator at the CERN high-radiation to materials facility
/ Cauchi, Marija (CERN ; Malta U.) ; Aberle, O (CERN) ; Assmann, R W (CERN) ; Bertarelli, A (CERN) ; Carra, F (CERN) ; Cornelis, K (CERN) ; Dallocchio, A (CERN) ; Deboy, D (CERN) ; Lari, L (CERN) ; Redaelli, S (CERN) et al.
The correct functioning of a collimation system is crucial to safely operate highly energetic particle accelerators, such as the Large Hadron Collider (LHC). The requirements to handle high intensity beams can be demanding. [...]
2014 - 14 p.
- Published in : Phys. Rev. Spec. Top. Accel. Beams 17 (2014) 021004
APS Open Access article: PDF;
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5.
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Full text
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6.
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Beam feasibility study of a collimator with in-jaw beam position monitors
/ Wollmann, Daniel (CERN) ; Nosych, Andriy A (CERN ; Cockcroft Inst. Accel. Sci. Tech. ; Liverpool U.) ; Valentino, Gianluca (CERN) ; Aberle, Oliver (CERN) ; Aßmann, Ralph W (CERN) ; Bertarelli, Alessandro (CERN) ; Boccard, Christian (CERN) ; Bruce, Roderik (CERN) ; Burkart, Florian (CERN) ; Calvo, Eva (CERN) et al.
At present, the beam-based alignment of the LHC collimators is performed by touching the beam halo with both jaws of each collimator. This method requires dedicated fills at low intensities that are done infrequently and makes this procedure time consuming. [...]
2014 - 7 p.
- Published in : Nucl. Instrum. Methods Phys. Res., A 768 (2014) 62-68
Elsevier Open Access article: PDF;
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7.
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Multi-turn losses and cleaning in 2011 and 2012
/ Valentino, G (CERN ; Malta U.) ; Assmann, R W (CERN) ; Bellodi, G (CERN) ; Bruce, R (CERN) ; Burkart, F (CERN) ; Cauchi, M (CERN) ; Deboy, D (CERN) ; Jowett, J M (CERN) ; Lari, L (CERN) ; Redaelli, S (CERN) et al.
LHC beam collimation is based on a hierarchical multistage cleaning system. Maintaining the correct hierarchy ensures maximal cleaning efficiency and machine protection. [...]
2012
Published version from CERN: PDF;
In : 3rd Evian Workshop on LHC beam operation, Evian-les-bains, France, 12 - 14 Dec 2011, pp.111-116
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8.
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Simulations and measurements of beam loss patterns at the CERN Large Hadron Collider
/ Bruce, R. (CERN) ; Assmann, R.W. (DESY) ; Boccone, V. (CERN) ; Bracco, C. (CERN) ; Brugger, M. (CERN) ; Cauchi, M. (CERN) ; Cerutti, F. (CERN) ; Deboy, D. (CERN) ; Ferrari, A. (CERN) ; Lari, L. (CERN ; Valencia U., IFIC) et al.
The CERN Large Hadron Collider (LHC) is designed to collide proton beams of unprecedented energy, in order to extend the frontiers of high-energy particle physics. During the first very successful running period in 2010--2013, the LHC was routinely storing protons at 3.5--4 TeV with a total beam energy of up to 146 MJ, and even higher stored energies are foreseen in the future. [...]
arXiv:1409.3123.-
2014-08-21 - 16 p.
- Published in : Phys. Rev. Spec. Top. Accel. Beams 17 (2014) 081004
APS Open Access article: PDF; Fulltext: PDF; External link: Preprint
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9.
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Handling 1 MW losses with the LHC collimation system
/ Salvachua, B (CERN) ; Bruce, R (CERN) ; Carra, F (CERN) ; Cauchi, M (CERN) ; Del Busto, E (CERN) ; Höfle, W (CERN) ; Holzer, E (CERN) ; Jacquet, D (CERN) ; Mirarchi, D (CERN) ; Redaelli, S (CERN) et al.
The LHC superconducting magnets in the dispersion suppressor of IR7 are the most exposed to beam losses leaking from the betatron collimation system and represent the main limitation for the halo cleaning. In 2013, quench tests were performed at 4 TeV to improve the quench limit estimates, which determine the maximum allowed beam loss rate for a given collimation cleaning. [...]
CERN-ACC-2014-0133.-
Geneva : CERN, 2014 - 4 p.
Fulltext: PDF; External link: Published version from JaCoW
In : 5th International Particle Accelerator Conference, Dresden, Germany, 15 - 20 Jun 2014, pp.174
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10.
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Quench tests at the Large Hadron Collider with collimation losses at 3.5 Z TeV
/ Redaelli, S (CERN) ; Assmann, R W (CERN) ; Bellodi, G (CERN) ; Brodzinski, K (CERN) ; Bruce, R (CERN) ; Burkart, F (CERN) ; Cauchi, M (CERN) ; Deboy, D (CERN) ; Dehning, B (CERN) ; Holzer, E B (CERN) et al.
The Large Hadron Collider (LHC) has been operating since 2010 at 3.5 TeV and 4.0 TeV without experiencing quenches induced by losses from circulating beams. This situation might change at 7 TeV where the quench margins in the super-conducting magnets are reduced. [...]
2013 - 5 p.
External link: Published version from JACoW
In : 52nd ICFA Advanced Beam Dynamics Workshop on High-Intensity and High-Brightness Hadron Beams, Beijing, China, 17 - 21 Sep 2012, pp.157
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