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Evian 2010 Workshop on LHC Commissioning
19 - 20 Jan 2010
- Evian-les-Bains, France
/ Goddard, Brennan (CERN)
The Evian 2010 workshop on LHC commissioning aimed to review the 2009 LHC beam commissioning and beam operations experience, and to look forward to the continued commissioning and operation of the LHC with beam in 2010. Beam related experiences from injection to stable beams were discussed. [...]
Geneva : CERN, 2010 - 168 p.
CERN-ATS-2010-028
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2.
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Chamonix 2010 Workshop on LHC Performance - Chamonix 2010
25 - 29 Jan 2010
- Chamonix, France
/ Carli, C (ed.) (CERN)
The Chamonix 2010 workshop on LHC performance focused on how to reach design energy and to push the performance efficiently and under safe conditions. Strategies for consolidation of the magnet interconnects and underground interventions, safety aspects comprising the performance of the access system and radiation monitoring and radiation to electronics have been discussed. [...]
Geneva : CERN, 2010 - 376 p.
CERN-ATS-2010-026
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4.
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Temperature Induced Degradation of Nb Ti/Cu Composite Superconductors
/ Scheuerlein, C (CERN) ; Pong, I (CERN) ; Senatore, C (Geneva U.) ; Di Michiel, M (ESRF, Grenoble) ; Thilly, L (Poitiers U.) ; Gerardin, A (CERN) ; Reluner, B (Federal Lab. for Materials Res., Germany) ; Oberli, L (CERN) ; Willering, G (CERN) ; Bottura, L (CERN)
The degradation mechanisms of state-of-the-art Nb-Ti/Cu superconductors are described, based on in-situ synchrotron X-ray diffraction measurements during heat treatment. [...]
CERN-ATS-2010-004.
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2009. - 5 p.
Full text
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5.
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Phase Transformations during the Reaction Heat Treatment
/ Scheuerlein, C (CERN) ; Di Michiel, M (ESRF, Grenoble) ; Thilly, L (Poitiers U.) ; Buta, F (Geneva U.) ; Peng, X (Hyper Tech Research Inc., Columbus) ; Gregory, E (Supergenics LLC I, Jefferson) ; Parrell, J A (Oxford Supercond. Tech., Carteret) ; Pong, I (CERN) ; Bordini, B (CERN) ; Cantoni, M (EPFL, Lausanne)
The evolution of Nb containing phases during the diffusion heat treatment of three different high critical current Nb$_{3}$Sn strand types is compared, based on synchrotron X-ray diffraction results that have been obtained at the ID15 beam line of the European Synchrotron Radiation Facility (ESRF). [...]
CERN-ATS-2010-005.
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2009. - 7 p.
Full text
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6.
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Superconductivity: Its Role, Its Success and Its Setbacks in the Large Hadron Collider of CERN
/ Rossi, L (CERN)
The Large Hadron Collider - LHC, the particle accelerator at CERN, Geneva, is the largest and probably the most complex scientific instrument ever built. Superconductivity plays a key role because the accelerator is based on the reliable operation of almost 10,000 superconducting magnets cooled by 130 tonnes of helium at 1.9 and 4.2 K and containing a total stored magnetic energy of about 15,000 MJ (including detector magnets). [...]
CERN-ATS-2010-006.-
Geneva : CERN, 2010 - 27 p.
- Published in : Supercond. Sci. Technol. 23 (2010) 034001
Fulltext: PDF;
In : 9th European Conference on Applied Superconductivity, Dresden, Germany, 13 - 17 Sep 2009, pp.034001
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8.
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The Low-Level Control System for the CERN PS Multi-Turn Extraction Kickers
/ Schipper, J (CERN) ; Bleus, B (CERN) ; Boucly, C (CERN) ; Carlier, E (CERN) ; Fowler, T (CERN) ; Gaudillet, H (CERN) ; Noulibos, R (CERN) ; Sermeus, L (CERN)
To reduce the beam losses when preparing high intensity proton beam for the CERN Neutrino to Gran Sasso (CNGS) facility, a new Multi-Turn extraction (MTE) scheme has been implemented in the PS, to replace the present Continuous Transfer (CT) to the SPS [...]
CERN-ATS-2010-008.
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2010. - 4 p.
Full text
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9.
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The LHC Post Mortem Analysis Framework
/ Andreassen, O O (CERN) ; Baggiolini, V (CERN) ; Castaneda, A (CERN) ; Gorbonosov, R (CERN) ; Khasbulatov, D (CERN) ; Reymond, H (CERN) ; Rijllart, A (CERN) ; Romera Ramirez, I (CERN) ; Trofimov, N (CERN) ; Zerlauth, M (CERN)
The LHC with its unprecedented complexity and criticality of beam operation will need thorough analysis of data taken from systems such as power converters, interlocks and beam instrumentation during events like magnet quenches and beam loss. [...]
CERN-ATS-2010-009.
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2010. - 4 p.
Full text
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12.
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The Control System for the Cryogenics in the LHC Tunnel [First Experience and Improvements]
/ Gomes, P (CERN) ; Blanco, E (CERN) ; Casas, J (CERN) ; Fluder, C (CERN) ; Fortescue, E (CERN) ; Le Roux, P (CERN) ; Penacoba, G (CERN) ; Pezzetti, M (CERN) ; Soubiran, M (CERN) ; Tovar, A (CERN) et al.
The Large Hadron Collider (LHC) was commissioned at CERN and started operation with beams in 2008. [...]
CERN-ATS-2010-012.
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2010. - 4 p.
Full text
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13.
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Radiation Tests on the Complete System of the Instrumentation of the LHC Cryogenics at the CERN Neutrinos to Gran Sasso (CNGS) Test Facility
/ Gousiou, E (CERN) ; Fernandez Penacoba, G (CERN) ; Casas Cubillos, J (CERN) ; de la Gama Serrano, J (CERN)
There are more than 6000 electronic cards for the instrumentation of the LHC cryogenics, housed in crates and distributed around the 27 km tunnel. Cards and crates will be exposed to a complex radiation field during the 10 years of LHC operation. [...]
CERN-ATS-2010-013.-
Geneva : CERN, 2009 - 5 p.
Fulltext: PDF; Published version from CERN: PDF;
In : Topical Workshop on Electronics for Particle Physics, Paris, France, 21 - 25 Sep 2009, pp.161-164 (CERN-2009-006)
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14.
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Commissioning of the CMS Cryogenic System After Final Installation in the Underground Cavern
/ Dupont, T (CERN) ; Courty, J C (Air Liquide, Sassenage) ; Perinic, G (CERN)
After having served for the surface tests of the Compact Muon Solenoid (CMS) magnet, the cold box and ancillaries of the CMS helium refrigerator have been dismantled, moved and re-installed in the USC55 cavern in 2007. The full re-commissioning in the cavern has been followed by several tests of the refrigerator to confirm its nominal performance before it was used for the magnet and detector tests in 2008. [...]
CERN-ATS-2010-014.-
Geneva : CERN, 2010 - 9 p.
- Published in : AIP Conf. Proc. 1218 (2010) 3-10
Fulltext: PDF;
In : Cryogenic Engineering Conference and International Cryogenic Materials Conference, Tucson, AR, USA, 28 Jun - 2 Jul 2009, pp.3-10
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15.
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Commissioning and First Operation of the Low-Beta Triplets and Their Electrical Feed Boxes at the Large Hadron Collider
/ Darve, C (Fermilab) ; Balle, C (CERN) ; Casas-Cubillos, J (CERN) ; Claudet, S (CERN) ; Feher, S (Fermilab) ; Ferlin, G (CERN) ; Kerby, J (Fermilab) ; Metral, L (CERN) ; Perin, A (CERN) ; Peterson, T (Fermilab) et al.
The insertion regions located around the four interaction points of the Large Hadron Collider (LHC) are mainly composed of the low-b triplets, the separation dipoles and their respective electrical feed-boxes (DFBX). The low-b triplets are Nb-Ti superconductor quadrupole magnets, which operate at 215 T/m in superfluid helium at a temperature of 1.9 K. [...]
CERN-ATS-2010-015.-
Geneva : CERN, 2010 - 9 p.
- Published in : AIP Conf. Proc. 1218 (2010) 1283-1290
Fulltext: PDF;
In : Cryogenic Engineering Conference and International Cryogenic Materials Conference, Tucson, AR, USA, 28 Jun - 2 Jul 2009, pp.1283-1290
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16.
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1.9 K Heat Inleak and Resistive Heating Measurements on LHC Cryomagnets
/ Ferlin, G (CERN) ; Claudet, S (CERN) ; Tavian, L (CERN) ; Wagner, U (CERN)
The superconducting magnets of the Large Hadron Collider (LHC) distributed over eight sectors of 3.3-km long are cooled at 1.9 K in pressurized superfluid helium. During the commissioning campaign of the sectors in 2008, cold standby periods at nominal operating temperature have allowed to measure the overall static heat inleaks reaching the magnet cold masses at 1.9 K by enthalpy balance in steady-state operation. [...]
CERN-ATS-2010-016.-
Geneva : CERN, 2010 - 9 p.
- Published in : AIP Conf. Proc. 1218 (2010) 1275-1282
Fulltext: PDF;
In : Cryogenic Engineering Conference and International Cryogenic Materials Conference, Tucson, AR, USA, 28 Jun - 2 Jul 2009, pp.1275-1282
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17.
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Cryogenic Loop Heat Pipes for the Cooling of Small Particle Detectors at CERN
/ Pereira, H (CERN) ; Haug, F (CERN) ; Silva, P (CERN) ; Wu, J (CERN) ; Koettig, T (CERN)
The loop heat pipe (LHP) is among the most effective heat transfer elements. Its principle is based on a continuous evaporation/condensation process and its passive nature does not require any mechanical devices such as pumps to circulate the cooling agent. [...]
CERN-ATS-2010-017.-
Geneva : CERN, 2010 - 9 p.
- Published in : AIP Conf. Proc. 1218 (2010) 1039-1046
Fulltext: PDF;
In : Cryogenic Engineering Conference and International Cryogenic Materials Conference, Tucson, AR, USA, 28 Jun - 2 Jul 2009, pp.1039-1046
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18.
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Commissioning and First Operation of Superconducting Links at the Large Hadron Collider (LHC)
/ van Weelderen, R (CERN) ; Goiffon, T (CERN) ; Perin, A (CERN) ; Darve, C (Fermilab) ; Doohan, R S (Indore, Ctr. for Advanced Tech.) ; Gilankar, S G (Indore, Ctr. for Advanced Tech.)
The Large Hadron Collider (LHC) now under commissioning at CERN is a 26.7 km collider based on several thousand high-field superconducting magnets, the majority of which operating in superfluid helium below 2 K and some isolated magnets operating in normal helium at 4.5 K. Four superconducting links (DSLs) of about 76 m in length and one of about 517 m in length, were designed, constructed and installed over a three year period. [...]
CERN-ATS-2010-018.-
Geneva : CERN, 2010 - 9 p.
- Published in : AIP Conf. Proc. 1218 (2010) 1301-1308
Fulltext: PDF;
In : Cryogenic Engineering Conference and International Cryogenic Materials Conference, Tucson, AR, USA, 28 Jun - 2 Jul 2009, pp.1301-1308
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19.
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Cooling System for the Merit High-Power Target Experiment
/ Haug, F (CERN) ; Pereira, H (CERN) ; Silva, P (CERN) ; Pezzeti, M (CERN) ; Pavlov, O (CERN) ; Pirotte, O (CERN) ; Metselaar, J (CERN) ; Efthymiopoulos, I (CERN) ; Fabich, A (CERN) ; Lettry, J (CERN) et al.
MERIT is a proof-of-principle experiment of a target station suitable as source for future muon colliders or neutrino factories. When installed at the CERN (European Organization for Nuclear Research) PS (Proton Synchrotron)complex fast-extracted high-intensity proton beams intercepted a free mercury jet inside a normal-conducting, pulsed 15-T capture solenoid magnet cooled with liquid nitrogen. [...]
CERN-ATS-2010-019.-
Geneva : CERN, 2010 - 9 p.
- Published in : AIP Conf. Proc. 1218 (2010) 1023-1030
Fulltext: PDF;
In : Cryogenic Engineering Conference and International Cryogenic Materials Conference, Tucson, AR, USA, 28 Jun - 2 Jul 2009, pp.1023-1030
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20.
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Exergy Analysis of the Cryogenic Helium Distribution System for the Large Hadron Collider (LHC)
/ Claudet, S (CERN) ; Lebrun, Ph (CERN) ; Tavian, L (CERN) ; Wagner, U (CERN)
The Large Hadron Collider (LHC) at CERN features the world’s largest helium cryogenic system, spreading over the 26.7 km circumference of the superconducting accelerator. With a total equivalent capacity of 145 kW at 4.5 K including 18 kW at 1.8 K, the LHC refrigerators produce an unprecedented exergetic load, which must be distributed efficiently to the magnets in the tunnel over the 3.3 km length of each of the eight independent sectors of the machine. [...]
CERN-ATS-2010-020.-
Geneva : CERN, 2010 - 9 p.
- Published in : AIP Conf. Proc. 1218 (2010) 1267-1274
Fulltext: PDF;
In : Cryogenic Engineering Conference and International Cryogenic Materials Conference, Tucson, AR, USA, 28 Jun - 2 Jul 2009, pp.1267-1274
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21.
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Commissioning of the Cryogenics of the LHC Long Straight Sections
/ Perin, A. (CERN) ; Casas-Cubillos, J. (CERN) ; Claudet, S. (CERN) ; Darve, C. (Fermilab) ; Ferlin, G. (CERN) ; Millet, F. (CERN) ; Parente, C. (CERN) ; Rabehl, R. (Fermilab) ; Soubiran, M. (CERN) ; van Weelderen, R. (CERN) et al.
The LHC is made of eight circular arcs interspaced with eight Long Straight Sections (LSS). Most powering interfaces to the LHC are located in these sections where the particle beams are focused and shaped for collision, cleaning and acceleration. [...]
arXiv:1207.7093; FERMILAB-CONF-09-772-AD; FERMILAB-CONF-09-772-AD.-
Geneva : CERN, 2010-04-23 - 8 p.
- Published in : AIP Conf. Proc. 1218 (2010) 1309-1316
Fulltext: arXiv:1207.7093 - PDF; fermilab-conf-09-772 - PDF; CERN-ATS-2010-021 - PDF; External link: Fermilab Library Server (fulltext available)
In : Cryogenic Engineering Conference and International Cryogenic Materials Conference, Tucson, AR, USA, 28 Jun - 2 Jul 2009, pp.1309-1316
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23.
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Performances Analysis of Main Components Used in 60 MW Pulsed Supply for Particle Accelerator
/ Peron, R (Converteam SAS, Belfort) ; Guennegues, V (Converteam SAS, Belfort) ; Pouliquen, JL (Converteam SAS, Belfort) ; Gollentz, B (Converteam SAS, Belfort) ; Bordry, F (CERN) ; Burnet, JP (CERN)
The Proton-Synchrotron (PS) accelerator at CERN will be supplied by a new power system. [...]
CERN-ATS-2010-023.
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2010. - 11 p.
Full text
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26.
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LHC Abort Gap Monitoring and Cleaning
/ This work was partly supported by the US Department of Energy, through the US LHC Accelerator Research Program (LARP) and contract DE-AC02-76SF00515 (SLAC). Collaboration
Unbunched beam is a potentially serious issue in the LHC as it may quench the superconducting magnets during a beam abort. Unbunched particles, either not captured by the RF system at injection or leaking out of the RF bucket, will be removed by using the existing damper kickers to excite resonantly the particles in the abort gap. [...]
CERN-ATS-2010-124.-
Geneva : CERN, 2010 - 4 p.
Fulltext: PDF; External link: Published version from JACoW
In : 1st International Particle Accelerator Conference, Kyoto, Japan, 23 - 28 May 2010, pp.MOPEC009
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27.
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Aperture Measurements of the LHC Injection Regions and Beam Dump Systems
/ Goddard, B (CERN) ; Bartmann, W (CERN) ; Bracco, C (CERN) ; Kain, V (CERN) ; Meddahi, M (CERN) ; Mertens, V (CERN) ; Uythoven, J (CERN)
The commissioning of the beam transfer systems for LHC included detailed aperture measurements in the injection regions and for the beam dump systems. The measurements, mainly single pass, were made using systematic scans of different oscillation phases and amplitudes, and the results compared with the expectations from the physical aperture model of the LHC. [...]
CERN-ATS-2010-125.-
Geneva : CERN, 2010 - 4 p.
Fulltext: PDF; External link: Published version from JACoW
In : 1st International Particle Accelerator Conference, Kyoto, Japan, 23 - 28 May 2010, pp.TUPEB068
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28.
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Stripping Foil Issues for H- Injection into the CERN PSB at 160 MeV
/ Goddard, B (CERN) ; Aiba, M (CERN) ; Bracco, C (CERN) ; Carli, C (CERN) ; Meddahi, M (CERN) ; Weterings, W J M (CERN)
Beam physics considerations for the stripping foil of the 160 MeV PSB H- injection systems are described, including the arguments for the foil type, thickness, geometry and positioning. The foil performance considerations are described, including expected stripping efficiency, emittance growth, energy straggling, temperature and lifetime. [...]
CERN-ATS-2010-126.-
Geneva : CERN, 2010 - 4 p.
Fulltext: PDF; External link: Published version from JACoW
In : 1st International Particle Accelerator Conference, Kyoto, Japan, 23 - 28 May 2010, pp.THPEB030
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30.
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The CERN Beam Interlock System: Principle and Operational Experience
/ Puccio, B (CERN) ; Castañeda Serra, A (CERN) ; Kwiatkowski, M (CERN) ; Romera Ramirez, I (CERN) ; Todd, B (CERN)
A complex Machine Protection System has been designed to protect the LHC machine from an accidental release of the beam energy, with about 20 subsystems providing status information to the Beam Interlock System that is the backbone of machine protection. Only if the subsystems are in the correct state for beam operation, the Beam Interlock System receives a status flag and beam can be injected into LHC (Large Hadron Collider). [...]
CERN-ATS-2010-128.-
Geneva : CERN, 2010 - 4 p.
Fulltext: PDF; External link: Published version from JACoW
In : 1st International Particle Accelerator Conference, Kyoto, Japan, 23 - 28 May 2010, pp.WEPEB073
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31.
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Upgrade of the Quench Protection Systems for the Superconducting Circuits of the LHC Machine at CERN: From Concept and Design to the First Operational Experience
/ Formenti, F (CERN) ; Charifoulline, Z (CERN) ; Coelingh, G J (CERN) ; Dahlerup-Petersen, K (CERN) ; Denz, R (CERN) ; Honma, A (CERN) ; Ravaioli, E (CERN) ; Schmidt, R (CERN) ; Siemko, A (CERN) ; Steckert, J (CERN) et al.
Two events, occurring in 2008 during commissioning of the LHC circuits, lead to fundamental changes to the scope of circuit protection. The discovery of aperturesymmetric quenches and the accidental rupture at 9 kA of an interconnecting busbar resulted in an emergency program for development and implementation of new protection facilities. [...]
CERN-ATS-2010-129.-
Geneva : CERN, 2010 - 4 p.
Fulltext: PDF; External link: Published version from JACoW
In : 1st International Particle Accelerator Conference, Kyoto, Japan, 23 - 28 May 2010, pp.MOPD013
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33.
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Performance Studies for Protection Against Asynchronous Dumps in the LHC
/ Kramer, T (CERN) ; Bartmann, W (CERN) ; Bracco, C (CERN) ; Goddard, B (CERN) ; Meddahi, M (CERN)
The LHC beam dump system has to safely dispose all beams in a wide energy range of 450 GeV to 7 TeV. A 3 ms abort gap in the beam structure for the switch-on of the extraction kicker field ideally allows a loss-free extraction under normal operating conditions. [...]
CERN-ATS-2010-131.-
Geneva : CERN, 2010 - 4 p.
Fulltext: PDF; External link: Published version from JACoW
In : 1st International Particle Accelerator Conference, Kyoto, Japan, 23 - 28 May 2010, pp.TUPEB063
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34.
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Design and Development of Kickers and Septa for Medaustron
/ Borburgh, J (CERN) ; Balhan, B (CERN) ; Barnes, M J (CERN) ; Fowler, T (CERN) ; Hinterschuster, F (Vienna, Tech. U.) ; Hourican, M (CERN) ; Kramer, T ; Palm, M (CERN) ; Prost, A (CERN) ; Sermeus, L (CERN) et al.
The MedAustron facility, to be built in Wiener Neustadt (Austria), will provide protons and ions for both cancer therapy and research. Different types of bumpers, septa and kickers will be used in the low energy beam transfer line, the synchrotron and the high energy extraction lines.They are presently being designed in collaboration with CERN. [...]
CERN-ATS-2010-132.-
Geneva : CERN, 2010 - 4 p.
Fulltext: PDF; External link: Published version from JACoW
In : 1st International Particle Accelerator Conference, Kyoto, Japan, 23 - 28 May 2010, pp.THPEB032
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35.
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Beam Commissioning of the Injection Protection System of the LHC
/ Bartmann, W (CERN) ; Assmann, R (CERN) ; Bracco, C (CERN) ; Dehning, B (CERN) ; Goddard, B (CERN) ; Holzer, E B (CERN) ; Kain, V (CERN) ; Meddahi, M (CERN) ; Nordt, A (CERN) ; Redaelli, S (CERN) et al.
The movable LHC injection protection devices in the SPS-to-LHC transfer lines and downstream of the injection kicker in the LHC were commissioned with low-intensity beam. The different beam-based alignment measurements used to determine the beam centre and size are described, together with the results of measurements of the transverse beam distribution at large amplitude. [...]
CERN-ATS-2010-133.-
Geneva : CERN, 2010 - 4 p.
Fulltext: PDF; External link: Published version from JACoW
In : 1st International Particle Accelerator Conference, Kyoto, Japan, 23 - 28 May 2010, pp.TUPEB067
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37.
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Beam Commissioning and Performance Characterisation of the LHC Beam Dump Kicker Systems
/ Uythoven, J (CERN) ; Carlier, E (CERN) ; Ducimetière, L (CERN) ; Goddard, B (CERN) ; Kain, V (CERN) ; Magnin, N (CERN)
The LHC beam dump system was commissioned with beam in 2009. This paper describes the operational experience with the kicker systems and the tests and measurements to qualify them for operation. [...]
CERN-ATS-2010-135.-
Geneva : CERN, 2010 - 4 p.
Fulltext: PDF; External link: Published version from JACoW
In : 1st International Particle Accelerator Conference, Kyoto, Japan, 23 - 28 May 2010, pp.TUPEB062
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38.
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Inductive Shimming of Superconductive Undulators - Preparations for a realistic test
/ Schoerling, D (CERN) ; Baumbach, T (Karlsruhe, Inst. Technol.) ; Bernhard, (Karlsruhe, Inst. Technol.) ; Burkart, F (Karlsruhe, Inst. Technol.) ; Ehlers, S (Karlsruhe, Inst. Technol.) ; Gerstl, S (Karlsruhe, Inst. Technol.) ; Grau, A (Karlsruhe, Inst. Technol.) ; Peiffer, P (Karlsruhe, Inst. Technol.) ; Rossmanith, R (Karlsruhe, Inst. Technol.) ; Wollmann, D (CERN)
The monochromaticity and intensity of synchrotron light emitted by undulators strongly depend on the undulator field quality. For the particular case of superconductive undulators it was shown recently that their field quality can be significantly improved by an array of coupled high temperature superconductor loops attached to the surface of the superconductive undulator. [...]
CERN-ATS-2010-136.-
Geneva : CERN, 2010 - 4 p.
Fulltext: PDF; External link: Published version from JACoW
In : 1st International Particle Accelerator Conference, Kyoto, Japan, 23 - 28 May 2010, pp.WEPD015
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39.
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Results of 2009 Optics Studies of the SPS to LHC Transfer Lines
/ Meddahi, M (CERN) ; Fartoukh, S (CERN) ; Fuchsberger, K (CERN) ; Goddard, B (CERN) ; Herr, W (CERN) ; Kain, V (CERN) ; Kaltchev, D (TRIUMF) ; Mertens, V (CERN) ; Wenninger, J (CERN)
In 2008, the SPS-to-LHC transfer line operation allowed for the first time to perform beam measurements in the last part of the lines and into the LHC. Beam parameters were measured and compared with expectation. [...]
CERN-ATS-2010-137.-
Geneva : CERN, 2010 - 4 p.
Fulltext: PDF; External link: Published version from JACoW
In : 1st International Particle Accelerator Conference, Kyoto, Japan, 23 - 28 May 2010, pp.TUPEB069
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40.
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The Final Beam Line Design for the HiRadMat Test Facility
/ Hessler, C (CERN) ; Goddard, B (CERN) ; Meddahi, M (CERN)
The High Radiation to Materials facility - hereafter HiRadMat - is designed to allow testing of accelerator components, in particular those of the LHC and its injectors, with the impact of high-intensity pulsed beams. The facility is currently under construction, as an approved CERN project [...]
CERN-ATS-2010-138.-
Geneva : CERN, 2010 - 4 p.
Fulltext: PDF; External link: Published version from JACoW
In : 1st International Particle Accelerator Conference, Kyoto, Japan, 23 - 28 May 2010, pp.THPEB029
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42.
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Beam-Based Measurement of the Waveform of the LHC Injection Kickers
/ Barnes, M J (CERN) ; Ducimetière, L (CERN) ; Goddard, B (CERN) ; Hessler, C (CERN) ; Mertens, V (CERN) ; Uythoven, J (CERN)
Proton and ion beams are injected into LHC at 450 GeV by two kicker magnet systems, producing magnetic field pulses of up to 7.8 ms flat top duration with rise and fall times of not more than 900 ns and 3 ms, respectively. Both systems are composed of four travelling wave kicker magnets, powered by pulse forming networks. [...]
CERN-ATS-2010-141.-
Geneva : CERN, 2010 - 4 p.
Fulltext: PDF; External link: Published version from JACoW
In : 1st International Particle Accelerator Conference, Kyoto, Japan, 23 - 28 May 2010, pp.WEPD088
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43.
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Development of Upgraded Magnetic Instrumentation for CERN Real-Time Reference Field Measurement Systems
/ Buzio, M (CERN) ; Beaumont, A (Fachhochsch., Wiener Neustadt) ; Galbraith, P (CERN) ; Golluccio, G (CERN) ; Giloteaux, D (CERN) ; Gilardoni, S (CERN) ; Petrone, C (CERN) ; Walckiers, L (CERN)
The control of five of the accelerators in the CERN injector chain (PS, PS Booster, SPS, LEIR and AD) is based upon real-time measurements in a reference magnet. These so-called “B-train” systems include a field marker to signal the achievement of a given field value, complemented by one or more pick-up coils to integrate flux changes. [...]
CERN-ATS-2010-142.-
Geneva : CERN, 2010 - 4 p.
Fulltext: PDF; External link: Published version from JACoW
In : 1st International Particle Accelerator Conference, Kyoto, Japan, 23 - 28 May 2010, pp.MOPEB016
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44.
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Mobile CT-System for In-situ Inspection in the LHC at CERN
/ Sauerwein, C (RayScan Technologies GmbH) ; Williams, L R (CERN) ; Caspers, F (CERN) ; Dalin, J M (CERN) ; Haemmerle, V (RayScan Technologies GmbH) ; Tiseanu, I (RayScan Technologies GmbH) ; Tock, J P (CERN)
For the inspection of certain critical elements of the LHC machine a mobile computed tomography system has been developed and built. This instrument has to satisfy stringent space, volume and weight requirements in order to be transportable and usable to any interconnection location in the LHC tunnel. [...]
CERN-ATS-2010-194; CERN-ATS-2010-143.-
Geneva : CERN, 2010 - 4 p.
Fulltext (CERN-ATS-2010-143): PDF; Fulltext (CERN-ATS-2010-194): PDF; External link: Published version from JACoW
In : 1st International Particle Accelerator Conference, Kyoto, Japan, 23 - 28 May 2010, pp.MOPEB076
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45.
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Towards a Consolidation of LHC Superconducting Splices for 7 TeV Operation
/ Bertinelli, F (CERN) ; Catalan Lasheras, N (CERN) ; Fessia, P (CERN) ; Garion, C (CERN) ; Mathot, S (CERN) ; Perin, A (CERN) ; Scheuerlein, C (CERN) ; Sgobba, S (CERN) ; ten Kat, H (CERN) ; Tock, J P (CERN) et al.
Following the analysis of the September 2008 LHC incident, the assembly process and the quality assurance of the main 13 kA interconnection splices were improved, with new measurement and diagnostics methods introduced. During the 2008-2009 shutdown ~5% of these 10 000 splices were newly assembled with these improvements implemented, but essentially maintaining the original design. [...]
CERN-ATS-2010-144.-
Geneva : CERN, 2010 - 4 p.
Fulltext: PDF; External link: Published version from JACoW
In : 1st International Particle Accelerator Conference, Kyoto, Japan, 23 - 28 May 2010, pp.MOPEB042
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46.
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Measurement and Scaling Laws of the Sextupole Component in the LHC Dipole Magnets
/ Walckiers, L (CERN) ; Arpaia, P (Sannio U. ; CERN) ; Bottura, L (CERN) ; Buzio, M (CERN) ; Dunkel, O (CERN) ; Fiscarelli, L (Sannio U. ; CERN) ; Montenero, G (Sannio U. ; CERN) ; Garcia Perez, J (CERN) ; Todesco, E (CERN)
One of the main requirements for the magnet operation of the Large Hadron Collider at CERN is the correction of the dynamic multipole errors produced. In particular, integrated sextupole errors in the main dipoles must be kept well below 0.1 units to ensure acceptable chromaticity. [...]
CERN-ATS-2010-149.-
Geneva : CERN, 2010 - 4 p.
Fulltext: PDF; External link: Published version from JACoW
In : 1st International Particle Accelerator Conference, Kyoto, Japan, 23 - 28 May 2010, pp.MOPEB018
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48.
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The Magnetic Model of the LHC in the Early Phase of Beam Commissioning
/ Todesco, E (CERN) ; Aquilina, N (CERN) ; Auchmann, B (CERN) ; Bottura, L (CERN) ; Buzio, M (CERN) ; Chritin, R (CERN) ; Deferne, G (CERN) ; Deniau, L (CERN) ; Fiscarelli, L (CERN) ; Hagen, P (CERN) et al.
The relation between field and current in each family of the Large Hadron Collider magnets is modelled with a set of empirical equations (FiDeL) whose free parameters are fit on magnetic measurements. They take into account residual magnetization, persistent currents, hysteresis, saturation, decay and snapback during initial part of the ramp. [...]
CERN-ATS-2010-154.-
Geneva : CERN, 2010 - 4 p.
Fulltext: PDF; External link: Published version from JACoW
In : 1st International Particle Accelerator Conference, Kyoto, Japan, 23 - 28 May 2010, pp.MOOCRA01
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49.
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CLIC Pre-damping and Damping Ring Kickers: Initial Ideas to Achieve Stability Requirements
/ Barnes, M J (CERN) ; Ducimetière, L (CERN) ; Uythoven, J (CERN)
The Compact Linear Collider (CLIC) study is exploring the scheme for an electron-positron collider with high luminosity (1034-1035 cm-2s-1) and a nominal centre-of mass energy of 3 TeV: CLIC would complement LHC physics in the multi-TeV range. The CLIC design relies on the presence of Pre-Damping Rings (PDR) and Damping Rings (DR) to achieve the very low emittance, through synchrotron radiation, needed for the luminosity requirements of CLIC. [...]
CERN-ATS-2010-161; CLIC-Note-854.-
Geneva : CERN, 2010 - 4 p.
Fulltext: PDF; External link: Published version from JACoW
In : 1st International Particle Accelerator Conference, Kyoto, Japan, 23 - 28 May 2010, pp.WEPD089
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50.
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First Magnetic Tests of a Superconducting Damping Wiggler for the CLIC Damping Rings
/ Schoerling, D (CERN) ; Ams, A (T.U. Bergakademie Freiberg) ; Bernhard, A (Karlsruhe, Inst. Technol.) ; Karppinen, M (CERN) ; Maccaferri, R (CERN) ; Peiffer, P (Karlsruhe, Inst. Technol.) ; Rossmanith, R (Karlsruhe, Inst. Technol.)
Each of the proposed CLIC electron and positron damping rings will be equipped with 76 wigglers. The length of each wiggler is 2 m, the period length lambda 40 to 50 mm, and the beam-stay-clear gap 13 mm. [...]
CERN-ATS-2010-162; CLIC-Note-853.-
Geneva : CERN, 2010 - 4 p.
Fulltext: PDF; External link: Published version from JACoW
In : 1st International Particle Accelerator Conference, Kyoto, Japan, 23 - 28 May 2010, pp.WEPD039
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51.
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Design, Manufacturing and Testing of the CTF3 Tail Clipper Kicker
/ Barnes, M J (CERN) ; Fowler, T (CERN) ; Ravida, G (CERN) ; Rodriguez, I (Madrid, CIEMAT) ; Toral, F (Madrid, CIEMAT)
The goal of the present CLIC Test Facility (CTF3) is to demonstrate the technical feasibility of specific key issues of the CLIC scheme. The extracted drive beam from the combiner ring (CR), a pulse of 35 A magnitude and 140 ns duration, is sent to the new CLic EXperimental area (CLEX). [...]
CERN-ATS-2010-163; CLIC-Note-852.-
Geneva : CERN, 2010 - 4 p.
Fulltext: PDF; External link: Published version from JACoW
In : 1st International Particle Accelerator Conference, Kyoto, Japan, 23 - 28 May 2010, pp.WEPD087
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53.
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A discrete 2-D Formulation for 3-D Field Problems with Continuous Symmetry
/ Auchmann, B (CERN) ; Flemisch, B (Stuttgart U.) ; Kurz, S (ETAS, Stuttgart)
We describe a general formalism that allows to reduce the spatial dimension of a field problem from 3-D to (2+1)-D. Subsequently we identify conditions under which the third dimension can be eliminated.We see that the resulting 2-D field problems only decouple if an orthogonality criterion is fulfilled.The approach is based solely on differential-form calculus and can therefore be easily transferred into a discrete setting. [...]
CERN-ATS-2010-165.-
Geneva : CERN, 2010 - 5 p.
- Published in : IEEE Trans. Magn. 46 (2010) 3508-3511
Fulltext: PDF; IEEE Published version, local copy: PDF;
In : COMPUMAG 2009, Florianpolis, Brazil, 22 - 26 Nov 2009, pp.3508-3511
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55.
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Sn Concentration Gradients in Powder-in-tube Superconductors
/ Cantoni, M (LPHE, Lausanne) ; Scheuerlein, C (CERN) ; Pfirter, P Y (LPHE, Lausanne) ; de Borman, F (LPHE, Lausanne) ; Rossen, J (LPHE, Lausanne) ; Arnau, G (CERN) ; Oberli, L (Florida State U.) ; Lee, P
The Sn concentration gradients across the A15 phase have been studied by Energy Dispersive X-ray Spectroscopy (EDS) measurements. [...]
CERN-ATS-2010-167.
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2010. - 7 p.
Full text
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58.
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Magneto-Thermal Stability in LARP Nb$_{3}$Sn TQS Magnets
/ Bordini, B (CERN) ; Bajko, M (CERN) ; Caspi, S (LBL, Berkeley) ; Dietderich, D (LBL, Berkeley) ; Felice, H (LBL, Berkeley) ; Ferracin, P (LBL, Berkeley) ; Rossi, L (CERN) ; Sabbi, G L (LBL, Berkeley) ; Takala, E (CERN)
In the framework of the US LHC Accelerator Program (LARP), three US laboratories BNL, FNAL and LBNL are developing Nb$_{3}$Sn quadrupole magnets for the Large Hadron Collider (LHC) luminosity upgrade. At present CERN is supporting this activity by testing some of the LARP 1 m long 90 mm aperture magnets. [...]
CERN-ATS-2010-170.-
Geneva : CERN, 2010 - 6 p.
- Published in : IEEE Trans. Appl. Supercond. 20 (2010) 274-278
Fulltext: PDF; IEEE Published version, local copy: PDF;
In : 21st International Conference on Magnet Technology, Hefei, China, 18 - 23 Oct 2009, pp.274-278
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59.
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Conceptual Design of a new Sample Holder for the Fresca Cable Test Station
/ Bordini, B (CERN) ; Regis, F (CERN) ; Crettiez, O (CERN) ; Fessia, P (CERN) ; Guinchard, M (CERN) ; Perez, J C (CERN) ; Sexton, I (CERN)
At present Nb$_{3}$Sn Rutherford Cables seem to be the most suitable conductors for next generation superconducting accelerator magnets. These magnets will have a peak field in the coils larger than 10 T and the large Lorentz forces will impose coil pre-stresses significantly larger than 100 MPa. [...]
CERN-ATS-2010-171.-
Geneva : CERN, 2010 - 5 p.
- Published in : IEEE Trans. Appl. Supercond. 20 (2010) 1511-1514
Fulltext: PDF; IEEE Published version, local copy: PDF;
In : 21st International Conference on Magnet Technology, Hefei, China, 18 - 23 Oct 2009, pp.1511-1514
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60.
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Predicting the Quench Behavior of the LHC Dipoles during Commissioning
/ Lorin, C (CERN) ; Siemko, A (CERN) ; Todesco, E (CERN) ; Verweij, A (CERN)
The LHC hardware commissioning has shown a considerable difference of performance between the three dipole manufacturers (Firm1, Firm2 and Firm3). More than 90% of the quenches occurred in the dipoles made by Firm3, less than 10% in Firm2, and no one in Firm1. [...]
CERN-ATS-2010-172.-
Geneva : CERN, 2010 - 6 p.
- Published in : IEEE Trans. Appl. Supercond. 20 (2010) 135-139
Fulltext: PDF; IEEE Published version, local copy: PDF;
In : 21st International Conference on Magnet Technology, Hefei, China, 18 - 23 Oct 2009, pp.135-139
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63.
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High-Current Bus Splice Resistances and Implications for the Operating Energy of the LHC
/ Koratzinos, M (CERN) ; Bertinelli, F (CERN) ; Charifoulline, Z (CERN) ; Dahlerup-Petersen, K (CERN) ; Denz, R (CERN) ; Flora, R H (Fermilab) ; Pfeffer, H (Fermilab) ; Scheuerlein, C (CERN) ; Schmidt, R (CERN) ; Siemko, A (CERN) et al.
At each interconnection between LHC main magnets a low-resistance solder joint must be made between superconducting cables in order to provide a continuous current path through the superconductor and also to the surrounding copper stabilizer in case the cable quenches [1]. About 10,000 such joints exist in the LHC. [...]
CERN-ATS-2010-175.-
Geneva : CERN, 2010 - 4 p.
Fulltext: PDF; External link: Published version from JACoW
In : 1st International Particle Accelerator Conference, Kyoto, Japan, 23 - 28 May 2010, pp.MOPEB044
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64.
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High Precision Current Control for the LHC Main Power Converters
/ Thiesen, H (CERN) ; Cerqueira Bastos, M (CERN) ; Hudson, G (CERN) ; King, Q (CERN) ; Montabonnet, V (CERN) ; Nisbet, D (CERN) ; Page, S (CERN)
Since restarting at the end of 2009, the LHC has reached a new energy record in March 2010 with the two 3.5 TeV beams. To achieve the performance required for the good functioning of the accelerator, the currents in the main circuits (Main Bends and Main Quadrupoles) must be controlled with a higher precision than ever previously requested for a particle accelerator at CERN: a few parts per million (ppm) of nominal current. [...]
CERN-ATS-2010-176.-
Geneva : CERN, 2010 - 4 p.
Fulltext: PDF; External link: Published version from JACoW
In : 1st International Particle Accelerator Conference, Kyoto, Japan, 23 - 28 May 2010, pp.WEPD070
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66.
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Measurements of the Resistance of Main Circuit Busbar Segments at the LHC at Warm
/ Koratzinos, M (CERN) ; Bertinelli, F (CERN) ; Flora, R H (Fermilab) ; Pfeffer, H (Fermilab) ; Scheuerlein, C (CERN) ; Siemko, A (CERN) ; Strait, J (Fermilab)
Following the QPS review in February 2009, a potential source of problems with the main circuit bus bar splices was identified: discontinuity in the copper stabilizer, coupled with lack of contact of the superconducting cable to the copper, in the vicinity of a splice [...]
CERN-ATS-2010-200.
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2010. - 57 p.
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