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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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Collimation system post-LS1: status and commissioning
/ Salvachua, B (CERN) ; Valentino, G (CERN) ; Aberle, O (CERN) ; Albertone, J (CERN) ; Athanasiadis, S (CERN) ; Baglin, V (CERN) ; Bertarelli, A (CERN) ; Boccard, C (CERN) ; Bruce, R (CERN) ; Carra, F (CERN) et al.
The LHC collimation system has undergone an important upgrade during LS1. A
total of 32 collimator installations are taking place to consolidate and improve
the Run 1 system. [...]
Geneva : CERN, 2014 - 6 p.
- Published in : (2014) , pp. 111-116
Fulltext: PDF;
In : 5th Evian Workshop on LHC beam operation, Evian-les-Bains, France, 2 - 4 Jun 2014, pp.111-116
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Chapter 5: Collimation System
/ Appleby, R. B. (U. Manchester (main) ; Cockcroft Inst. Accel. Sci. Tech.) ; Barlow, R. (Huddersfield U.) ; Bertarelli, A. (CERN) ; Bruce, R. (CERN) ; Carra, F. (CERN) ; Cerutti, F. (CERN) ; Esposito, L. (CERN) ; Faus-Golfe, A. (Valencia U., IFIC) ; Garcia Morales, H. (Royal Holloway, U. of London) ; Gentini, L. (CERN) et al.
Chapter 5 in High-Luminosity Large Hadron Collider (HL-LHC) : Preliminary Design Report. The Large Hadron Collider (LHC) is one of the largest scientific instruments ever built. [...]
arXiv:1705.09483; FERMILAB-TM-2658-AD-APC.-
Geneva : CERN, 2015 - 22 p.
- Published in : 10.5170/CERN-2015-005.109
Fulltext: arXiv:1705.09483 - PDF; fermilab-tm-2658-ad-apc - PDF; Published version from CERN: PDF; External link: Fermilab Library Server (fulltext available)
In : High-Luminosity Large Hadron Collider (HL-LHC), pp.109-130
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Beam Loss Monitoring for LHC Machine Protection
/ Holzer, Eva Barbara (CERN) ; Dehning, Bernd (CERN) ; Effnger, Ewald (CERN) ; Emery, Jonathan (CERN) ; Grishin, Viatcheslav (CERN) ; Hajdu, Csaba (CERN) ; Jackson, Stephen (CERN) ; Kurfuerst, Christoph (CERN) ; Marsili, Aurelien (CERN) ; Misiowiec, Marek (CERN) et al.
The energy stored in the nominal LHC beams is two times 362 MJ, 100 times the energy of the Tevatron. As little as 1 mJ/cm 3 deposited energy quenches a magnet at 7 TeV and 1 J/cm 3 causes magnet damage. [...]
2012 - 8 p.
- Published in : Phys. Procedia 37 (2012) 2055-2062
Elsevier Open Access article: PDF;
In : 2nd International Conference on Technology and Instrumentation in Particle Physics, Chicago, IL, USA, 9 - 14 Jun 2011, pp.2055-2062
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Simulations of fast crab cavity failures in the high luminosity Large Hadron Collider
/ Yee-Rendon, Bruce (CINVESTAV, IPN) ; Lopez-Fernandez, Ricardo (CINVESTAV, IPN) ; Barranco, Javier (CERN) ; Calaga, Rama (CERN) ; Marsili, Aurelien (CERN) ; Tomás, Rogelio (CERN) ; Zimmermann, Frank (CERN) ; Bouly, Frédéric (LPSC, Grenoble)
Crab cavities (CCs) are a key ingredient of the high luminosity Large Hadron Collider (HL-LHC) project for increasing the luminosity of the LHC. At KEKB, CCs have exhibited abrupt changes of phase and voltage during a time period of the order of a few LHC turns and considering the significant stored energy in the HL-LHC beam, CC failures represent a serious threat in regard to LHC machine protection. [...]
2014 - 12 p.
- Published in : Phys. Rev. Spec. Top. Accel. Beams 17 (2014) 051001
APS Open Access article: PDF;
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Collimation Cleaning for HL-LHC Optics Scenarios with Error Models
/ Marsili, Aurelien (CERN) ; Bruce, Roderik (CERN) ; Redaelli, Stefano (CERN)
The upgrade of the LHC collimation system in view of the High-Luminosity upgrade of the Large Hadron Collider (LHC) foresees, amongst other scenarios, local collimation in the dispersion suppressors (DS) of IR7. Layouts have been worked out which rely on using stronger and short bending dipoles to free space for a collimator in the cold DS. [...]
2014 - 3 p.
- Published in : , pp. MOPRO040
Fulltext: PDF; External link: Published version from JACoW
In : 5th International Particle Accelerator Conference, Dresden, Germany, 15 - 20 Jun 2014, pp.MOPRO040
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Power Deposition in LHC Magnets With and Without Dispersion Suppressor Collimators Downstream of the Betatron Cleaning Insertion
/ Lechner, Anton (CERN) ; Auchmann, Bernhard (CERN) ; Bruce, Roderik (CERN) ; Cerutti, Francesco (CERN) ; Granieri, Pier Paolo (CERN) ; Marsili, Aurelien (CERN) ; Redaelli, Stefano (CERN) ; Shetty, Nikhil Vittal (CERN) ; Skordis, Eleftherios (CERN) ; Steele, Genevieve (CERN) et al.
The power deposited in dispersion suppressor (DS) magnets downstream of the LHC betatron cleaning insertion is governed by off-momentum protons which predominantly originate from single-diffractive interactions in primary collimators. With higher beam energy and intensities anticipated in future operation, these clustered proton losses could possibly induce magnet quenches during periods of short beam lifetime. [...]
2014 - 4 p.
- Published in : 10.18429/JACoW-IPAC2014-MOPRO021
Fulltext: PDF; External link: Published version from JACoW
In : 5th International Particle Accelerator Conference, Dresden, Germany, 15 - 20 Jun 2014, pp.MOPRO021
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