CERN Accelerating science

LHC Articles

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2011-05-20
13:36
Proton-Nucleus Collisions at the LHC: Scientific Opportunities and Requirements / Salgado, C A (Santiago de Compostela U., IGFAE ; Santiago de Compostela U.) ; Alvarez-Muniz, J (Santiago de Compostela U., IGFAE) ; Arleo, F (Annecy, LAPTH) ; Armesto, N (Santiago de Compostela U., IGFAE) ; Botje, M (NIKHEF, Amsterdam) ; Cacciari, M (Paris, LPTHE) ; Campbell, J (Fermilab) ; Carli, C (CERN) ; Cole, B (Nevis Labs, Columbia U.) ; D'Enterria, D (CERN ; ICC, Barcelona U. ; ICREA, Barcelona) et al.
Proton-nucleus (p+A) collisions have long been recognized as a crucial component of the physics programme with nuclear beams at high energies, in particular for their reference role to interpret and understand nucleus-nucleus data as well as for their potential to elucidate the partonic structure of matter at low parton fractional momenta (small-x). Here, we summarize the main motivations that make a proton-nucleus run a decisive ingredient for a successful heavy-ion programme at the Large Hadron Collider (LHC) and we present unique scientific opportunities arising from these collisions. [...]
arXiv:1105.3919; CERN-PH-TH-2011-119; LHC-PROJECT-REPORT-1181.- Geneva : CERN, 2012 - 33 p. - Published in : J. Phys. G 39 (2012) 015010 External link: Preprint

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2009-11-06
15:51
Cold Leak Tests of LHC Beam Screens / Collomb-Patton, C (CERN) ; Cruikshank, P (CERN) ; Jenninger, B (CERN) ; Kos, N (CERN)
In order to guide the high energy proton beams inside its two 27 km long vacuum rings, the Large Hadron Collider (LHC) at CERN, Geneva, makes use of superconducting technology to create the required magnetic fields. More than 4000 beam screens, cooled at 7 20 K, are inserted inside the 1.9 K beam vacuum tubes to intercept beam induced heat loads and to provide dynamic vacuum stability. [...]
LHC-PROJECT-Report-1178; CERN-LHC-PROJECT-Report-1178.- Geneva : CERN, 2009 - 6 p. - Published in : Vacuum 84 (2009) 293-297
In : 12th Joint Vacuum Conference, 10th European Vacuum Conference and 7th Annual Meeting of the German Vacuum Society, Balatonalmadi, Hungary, 22 - 26 Sep 2008, pp.293-297

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2009-08-19
11:20
Measurements of heavy ion beam losses from collimation / Bruce, R (CERN) ; Assmann, Ralph Wolfgang (CERN) ; Bellodi, G (CERN) ; Bracco, C (CERN) ; Braun, H H (CERN) ; Gilardoni, S (CERN) ; Holzer, E B (CERN) ; Jowett, John M (CERN) ; Redaelli, S (CERN) ; Weiler, T (CERN) et al.
The collimation efficiency for Pb ion beams in the LHC is predicted to be lower than requirements. Nuclear fragmentation and electromagnetic dissociation in the primary collimators create fragments with a wide range of Z/A ratios, which are not intercepted by the secondary collimators but lost where the dispersion has grown sufficiently large. [...]
arXiv:0908.2553.- 2009 - 12 p. - Published in : Phys. Rev. Spec. Top. Accel. Beams 12 (2009) 011001 APS Published version, local copy: PDF; External link: Preprint

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2009-01-20
14:12
An overview of the LHC Transverse Diagnostics Systems / Boccardi, A (CERN) ; Gasior, M (CERN) ; Jones, O (CERN) ; Steinhagen, R J (CERN)
The unprecedented intensity and energy of the LHC proton beams will require an excellent control of the transverse beam dynamics in order to limit particle loss in the superconducting systems. Due to restricted tolerances of the machine protection system and a tight beam emittance blow-up budget only small beam excitation is allowed, making precise measurements of the transverse beam parameters very challenging. [...]
LHC-PROJECT-Report-1166; CERN-BE-2009-002.- Geneva : CERN, 2009 - 5 p. Fulltext: PDF;
In : 13th Beam Instrumentation Workshop, Tahoe City, CA, USA, 04 - 08 May 2008, pp.409-414

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2008-10-01
04:47
LHC Machine / Evans, Lyndon R (ed.) (CERN) ; Bryant, Philip (ed.) (CERN)
2008 - 164 p. - Published in : J. Instrum. 3 (2008) S08001 SISSA/IOP Open Access article: PDF;
In : The CERN Large Hadron Collider

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2008-09-05
15:04
Impact Distribution of the Beam Losses at the LHC Collimators in Case of Magnet Failures / Gómez Alonso, A (CERN)
During LHC operation, magnet failures may affect the beam optics leading to proton losses in the collimators. These losses, with about 360MJ of stored energy per beam at nominal collision operation, are potentially dangerous for the accelerator equipment. [...]
LHC-PROJECT-Report-1162; CERN-LHC-PROJECT-Report-1162.- Geneva : CERN, 2008 - 4 p. Preprint: PDF; External link: Published version from JACoW
In : 11th European Particle Accelerator Conference, Genoa, Italy, 23 - 27 Jun 2008, pp.WEPP068

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2008-09-05
14:50
Apertures in the LHC Beam Dump System and Beam Losses During Beam Abort / Kramer, T (CERN) ; Goddard, B (CERN) ; Gyr, M (CERN) ; Koschik, A (CERN) ; Uythoven, J (CERN) ; Weiler, T (CERN)
The LHC beam dumping system (LBDS) is used to dispose accelerated protons and ions in a wide energy range from 450 GeV up to 7 TeV. An abort gap of $3 \mu$s is foreseen to avoid sweeping particles through the LHC ring aperture. [...]
LHC-PROJECT-Report-1161; CERN-LHC-PROJECT-Report-1161.- Geneva : CERN, 2008 - 4 p. Fulltext: LHC-PROJECT-REPORT-1161_2 - PDF; LHC-PROJECT-REPORT-1161 - PDF; External link: Published version from JACoW
In : 11th European Particle Accelerator Conference, Genoa, Italy, 23 - 27 Jun 2008, pp.WEPP064

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2008-09-05
14:39
Abort Gap Cleaning using the Transverse Feedback System : Simulation and Measurements in the SPS for the LHC Beam Dump System / Koschik, A (CERN) ; Goddard, B (CERN) ; Höfle, Wolfgang (CERN) ; Kotzian, G (CERN) ; Kramer, Daniel (CERN) ; Kramer, T (CERN)
The critical and delicate process of dumping the beams of the LHC requires very low particle densities within the $3 \mu$s of the dump kicker rising edge. High beam population in this so-called 'abort gap' might cause magnet quenches or even damage. [...]
LHC-PROJECT-Report-1160; CERN-LHC-PROJECT-Report-1160.- Geneva : CERN, 2008 - 4 p. Fulltext: PDF; External link: Published version from JACoW
In : 11th European Particle Accelerator Conference, Genoa, Italy, 23 - 27 Jun 2008, pp.WEPP060

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2008-09-05
14:03
Results of the LHC Prototype Chromaticity Measurement System Studies in the CERN-SPS / Steinhagen, R (CERN) ; Boccardi, A (CERN) ; Bohl, T (CERN) ; Gasior, M (CERN) ; Jones, O R (CERN) ; Kasinski, K K (AGH-UST, Cracow) ; Wenninger, J (CERN)
Tune and chromaticity control is an integral part of safe and reliable LHC operation. Tight tolerances on the maximum beam excursions allow excitation amplitudes of less than 30 $\mu$m. [...]
LHC-PROJECT-Report-1159; CERN-LHC-PROJECT-Report-1159.- Geneva : CERN, 2008 - 4 p. Fulltext: PDF; External link: Published version from JACoW
In : 11th European Particle Accelerator Conference, Genoa, Italy, 23 - 27 Jun 2008, pp.TUPC098

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2008-09-05
11:25
Generation of 1.5 Million Beam Loss Threshold Values / Holzer, E B (CERN) ; Bocian, D (CERN) ; Böhlen, T T (CERN) ; Dehning, B (CERN) ; Kramer, Daniel (CERN) ; Ponce, L (CERN) ; Priebe, A (CERN) ; Sapinski, M (CERN) ; Stockner, M (CERN)
CERN's Large Hadron Collider will store an unprecedented amount of energy in its circulating beams. Beamloss monitoring (BLM) is, therefore, critical for machine protection. [...]
LHC-PROJECT-Report-1158; CERN-LHC-PROJECT-Report-1158.- Geneva : CERN, 2008 - 4 p. Preprint: PDF; External link: Published version from JACoW
In : 11th European Particle Accelerator Conference, Genoa, Italy, 23 - 27 Jun 2008, pp.THPC147

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