1.
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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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2.
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Design, construction, and beam tests of a rotatable collimator prototype for high-intensity and high-energy hadron accelerators
/ Markiewicz, T (SLAC) ; Bong, E (SLAC) ; Keller, L (SLAC) ; Smith, J (SLAC) ; Aberle, O (CERN) ; Accettura, C (CERN) ; Bertarelli, A (CERN) ; Berthome, E (CERN) ; Biancacci, N (CERN) ; Butcher, M (CERN) et al.
A rotatable-jaw collimator design was conceived as a solution to recover from catastrophic beam impacts which would damage a collimator at the Large Hadron Collider (LHC) or its High-Luminosity upgrade (HL-LHC). One such rotatable collimator prototype was designed and built at SLAC and delivered to CERN for tests with LHC-type circulating beams in the Super Proton Synchrotron (SPS). [...]
2019 - 15 p.
- Published in : Phys. Rev. Accel. Beams 22 (2019) 123002
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3.
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High Energy Beam Impact Tests on a LHC Tertiary Collimator at CERN HiRadMat Facility
/ Cauchi, M (CERN ; University of Malta, Msida, Malta) ; Aberle, O (CERN) ; Assmann, R (CERN) ; Bertarelli, A (CERN) ; Carra, F (CERN) ; Dallocchio, A (CERN) ; Deboy, D (CERN) ; Redaelli, S (CERN) ; Rossi, A (CERN) ; Salvachua, B (CERN) et al.
The correct functioning of the collimation system is crucial to safelyoperate the LHC. The requirements to handle high intensity beams can be demanding. [...]
CERN-ACC-2013-0051.-
Geneva : CERN, 2013 - 3 p.
Fulltext: PDF;
In : 4th International Particle Accelerator Conference, Shanghai, China, 12 - 17 May 2013, pp.954
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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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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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6.
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Acoustic measurements in the collimation region of the LHC
/ Deboy, D (CERN) ; Assmann, R W (CERN) ; Baccigalupi, C (CERN) ; Burkart, F (CERN) ; Cauchi, M (CERN) ; Derrez, C S (CERN) ; Lendaro, J (CERN) ; Masi, A (CERN) ; Spiezia, G (CERN) ; Wollmann, D (CERN)
The LHC accelerator at CERN has the most advanced collimation system ever being installed. The collimators intercept unavoidable particle losses and therefore are essential to avoid beam induced quenches of the superconducting magnets. [...]
CERN-ATS-2011-116.-
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.THPZ031
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7.
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Preliminary thermo-mechanical analysis of angular beam impact on LHC collimators
/ Cauchi, M (CERN ; Malta U.) ; Assmann, R (CERN) ; Bertarelli, A (CERN) ; Carra, F (CERN) ; Dallocchio, A (CERN) ; Deboy, D (CERN) ; Mariani, N (CERN) ; Rossi, A (CERN) ; Lari, L (CERN ; Valencia U., IFIC) ; Mollicone, P (Malta U.) et al.
The correct functioning of the LHC Collimation System is crucial to attain the desired LHC luminosity performance. However, the requirements to handle high intensity beams can be demanding. [...]
CERN-ATS-2012-234.-
Geneva : CERN, 2012 - 3 p.
- Published in : Conf. Proc.: C1205201 (2012) , pp. MOPPD079
Fulltext: PDF; External link: Published version from JaCoW
In : 3rd International Particle Accelerator Conference, New Orleans, LA, USA, 20 - 25 May 2012, pp.550
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8.
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First beam results for a collimator with in-jaw beam position monitors
/ Wollmann, D (CERN) ; Aberle, O (CERN) ; Aßmann, R W (CERN) ; Bertarelli, A (CERN) ; Boccard, C (CERN) ; Bruce, R (CERN) ; Burkart, F (CERN) ; Cauchi, M (CERN) ; Dallocchio, A (CERN) ; Deboy, D (CERN) et al.
With more than 100 collimators the LHC has the most complex collimation system ever installed in an accelerator. The beam-based setup time of the system was a nonnegligible factor during the commissioning of the LHC. [...]
CERN-ATS-2011-112.-
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.THPZ027
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9.
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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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10.
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Detecting Impacts of Proton Beams on the LHC Collimators With Vibration and Sound Measurements
/ Redaelli, Stefano ; Aberle, Oliver ; Assmann, R W ; Masi, Alessandro ; Spiezia, Giovanni
The 360 MJ stored energy of the 7 TeV LHC beams can seriously damage the beam line elements in case of accidental beam losses. Notably, the collimators will sit at 6 to 7 sigmas from the beam centre (1.2 to 1.4 mm) and will be hit and possibly damaged in case of failures, with a consequent degradation of the cleaning performance of the overall collimation system. [...]
LHC-Project-Report-843; CERN-LHC-Project-Report-843.-
Geneva : CERN, 2005 - 4 p.
Access to fulltext document: PDF; External link: Published version from JACoW
In : 21st IEEE Particle Accelerator Conference, Knoxville, TN, USA, 16 - 20 May 2005, pp.1018
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