865945 SzGeCERN 20230531152433.0 oai:cds.cern.ch:865945 cerncds:FULLTEXT cerncds:CERN:FULLTEXT INIS cerncds:CERN SPIRES 6501516 Inspire 702297 LHC-Project-Report-839 eng CERN-LHC-Project-Report-839 Sammut, Nicholas J The LHC Magnetic Field Model 2005 Geneva CERN 11 Jul 2005 4 p The compensation of the field changes during the beam injection and acceleration in the LHC requires an accurate forecast and an active control of the magnetic field in the accelerator. The LHC Magnetic Field Model is the core of this magnetic prediction system. The model will provide the desired field components at a given time, magnet operating current, magnet ramp rate, magnet temperature and magnet powering history to the required precision. The model is based on the identification and physical decomposition of the effects that contribute to the total field in the magnet aperture of the LHC dipoles. Each effect is quantified using data obtained from series measurements, and modeled theoretically or empirically depending on the complexity of the physical phenomena involved. This paper presents the developments of the new finely tuned magnetic field model and evaluates its accuracy and predictive capabilities over a sector of the machine. CERN EDS SIS PAC05-2006 SIS:2006 PR/LKR added SIS ARC-PR-2007 CLAS1 LHC-PROJECT-REPORT SzGeCERN Accelerators and Storage Rings CERN LHCPROJECTREPORT ARTICLE CERN LHC Not applicable Bottura, Luca AUTHOR|(CDS)2051225 #BEARD# Micallef, Joseph LHC http://documents.cern.ch/cgi-bin/setlink?base=generic&categ=public&id=cer-002544823 Access to fulltext document http://cds.cern.ch/record/865945/files/cer-002544823.pdf Access to fulltext document evelyne.delucinge@cern.ch CERN University of Malta, Msida n 200531 a2005 13 20100901 1606 CER01 20050805 719664 2648 knoxville20050516 PUBLIC 002544823CER ARTICLE ConferencePaper 865944 SzGeCERN 20240223161609.0 oai:cds.cern.ch:865944 cerncds:FULLTEXT cerncds:CERN:FULLTEXT INIS cerncds:CERN 10.1109/PAC.2005.1590407 DOI SPIRES 6206034 Inspire 670914 LHC-Project-Report-838 eng CERN-LHC-Project-Report-838 Chohan, Vinod Testing of the LHC Magnets in Cryogenic Conditions Operation Challenges, Status and Outlook 2005 Geneva CERN 11 Jul 2005 4 p For the Large Hadron Collider under construction at CERN and the testing of its 1706 Cryo-magnets in cryogenic conditions, considerable challenges had to be overcome since 2002 to arrive at the situation of today, with semi-routine operation of the purpose built tests facility. With the setting up of an Operation Team comprising of few non-expert CERN Accelerator operation staff, and a large external collaboration, it was essential to develop the methodology of working in light of external collaboration limits and base it on CERN-known techniques and experience in accelerator running-in, commissioning and routine operation. A flavour of the operation tools that were necessary or developed will be given, i.e., web-based tests follow-up management & information systems, development of precisely defined 'to do list' of tests sequences, associated methods, procedures and strict check-lists, electronic logbooks and so forth. The presentation will briefly outline the tests operation programme and its context & constraints, give a summary of the accomplishments so far, together with the outlook for the successful completion of the whole programme within the project goals. CC-BY publication JACoW CERN EDS Particle Accelerator Conference SIS:2006 PR/LKR added SIS PAC05-2006 SIS ARC-PR-2007 CLAS1 LHC-PROJECT-REPORT SzGeCERN Accelerators and Storage Rings CERN LHCPROJECTREPORT ARTICLE CERN LHC Not applicable LHC https://accelconf.web.cern.ch/p05/PAPERS/MOPA003.PDF Published version from JACoW http://documents.cern.ch/cgi-bin/setlink?base=preprint&categ=cern&id=lhcproj-2005-838 Access to fulltext document http://cds.cern.ch/record/865944/files/lhc-project-report-838.pdf Access to fulltext document evelyne.delucinge@cern.ch CERN n 200531 a2005 13 20100901 1606 CER01 20050805 719664 250 knoxville20050516 PUBLIC 002544822CER ARTICLE ConferencePaper 865943 SzGeCERN 20240223161609.0 oai:cds.cern.ch:865943 cerncds:FULLTEXT cerncds:CERN:FULLTEXT INIS cerncds:CERN LHC-Project-Report-837 eng CERN-LHC-Project-Report-837 Catalan-Lasheras, Nuria Field Quality and Alignment of the Series Produced Superconducting Matching Quadrupoles for the LHC Insertions 2005 Geneva CERN 11 Jul 2005 4 p The production of the superconducting quadrupoles for the LHC insertions is advancing well and about half of the magnets have been produced. The coil size and field measurements performed on individual magnets both in warm and cold conditions are yielding significant results. In this paper we present the procedures and results of steering the series production at the magnet manufacturers and the assembly of cold masses at CERN. In particular, we present the correlation between coil sizes and geometrical field errors, the effect of permeability of magnet collars, and the analysis of warm-cold correlations and hysteresis of the main field multipoles. The results are compared with the target values for field multipoles and quadrupole alignment. CC-BY publication JACoW CERN EDS SIS PAC05-2006 SIS ARC-PR-2007 CLAS1 LHC-PROJECT-REPORT SzGeCERN Accelerators and Storage Rings CERN LHCPROJECTREPORT ARTICLE CERN LHC Not applicable Venturini Delsolaro, W Kirby, Glyn Ostojic, Ranko Perez, Juan C Prin, Herve LHC http://documents.cern.ch/cgi-bin/setlink?base=preprint&categ=cern&id=lhcproj-2005-837 Access to fulltext document https://accelconf.web.cern.ch/p05/PAPERS/MPPT042.PDF Published version from JACoW http://cds.cern.ch/record/865943/files/lhc-project-report-837.pdf Access to fulltext document evelyne.delucinge@cern.ch CERN n 200531 a2005 13 20100401 2001 CER01 20050805 719664 2738 knoxville20050516 PUBLIC 002544821CER ARTICLE ConferencePaper 865942 SzGeCERN 20240223161609.0 oai:cds.cern.ch:865942 cerncds:FULLTEXT cerncds:CERN:FULLTEXT INIS cerncds:CERN SPIRES 6501559 Inspire 702301 LHC-Project-Report-836 eng CERN-LHC-Project-Report-836 Ostojic, Ranko The Construction of the Low-beta Triplets for the LHC 2005 Geneva CERN 11 Jul 2005 4 p The performance of the LHC depends critically on the low-b triplets, located on either side of the four interaction points. Each triplet consists of four superconducting quadrupole magnets, which must operate reliably at up to 215 T/m, sustain high heat loads and have an excellent field quality. A collaboration between CERN, Fermilab and KEK was set up in 1996 to design and build the triplet systems, and after nine years of joint effort the production will be completed in 2005. We retrace the main events of the project and present the performance of the low-b quadrupoles built by KEK and Fermilab and of other elements of the triplet. The assembly of the first triplet at CERN and plans for tunnel installation and commissioning in the LHC are also reported. CC-BY publication JACoW giva a faire CERN EDS SIS PAC05-2006 SIS:2006 PR/LKR added CLAS1 LHC-PROJECT-REPORT SzGeCERN Accelerators and Storage Rings CERN LHCPROJECTREPORT ARTICLE CERN LHC Not applicable Bossert, R Venturini Delsolaro, W Di Marco, Joseph Feher, Sandor Karppinen, Mikko AUTHOR|(CDS)2051169 #BEARD# Kerby, James Kimura, Nobuhiro Lamm, Michael J Nakamoto, Tatsushi AUTHOR|(CDS)2080261 #BEARD# Nicol, Thomas H Nobrega, Alfred Ogitsu, T Ohuchi, Norihito Page, Thomas M Peterson, Thomas J Rabehl, Roger Jon Schlabach, Philip Shintomi, Takakazu Strait, James Sylvester, C D Tartaglia, M Taylor, Thomas AUTHOR|(CDS)2069632 #BEARD# Tsuchiya, Kiyosumi Velev, Gueorgui Yamamoto, Akira AUTHOR|(CDS)2069387 #BEARD# LHC CERN-Fermilab-KEK Collaboration https://accelconf.web.cern.ch/p05/PAPERS/MPPT044.PDF Published version from JACoW http://documents.cern.ch/cgi-bin/setlink?base=preprint&categ=cern&id=lhcproj-2005-836 Access to fulltext document http://cds.cern.ch/record/865942/files/lhc-project-report-836.pdf Access to fulltext document evelyne.delucinge@cern.ch CERN Fermilab, Batavia, Illinois KEK, Ibaraki n 200531 a2005 13 20101108 1105 CER01 20050805 719664 2798 knoxville20050516 PUBLIC 002544820CER ARTICLE ConferencePaper 865941 SzGeCERN 20240223161608.0 oai:cds.cern.ch:865941 cerncds:FULLTEXT cerncds:CERN:FULLTEXT INIS cerncds:CERN SPIRES 6501540 Inspire 702300 LHC-Project-Report-835 eng CERN-LHC-Project-Report-835 CARE-CONF-05-005-HHH CARE-CONF-2005-005-HHH Ostojic, Ranko Low-beta Quadrupole Designs for the LHC Luminosity Upgrade 2005 Geneva CERN 11 Jul 2005 4 p Several scenarios are considered for the upgrade of the LHC insertions in view of increasing the luminosity beyond 1034 cm-2s-1. In the case of “quadrupole first” option, superconducting low-b quadrupoles with apertures in the range of 90-110 mm are required in view of increased heat loads and beam crossing angles. We present possible low-b quadrupole designs based on existing Nb$_{3}$Sn and LHC NbTi superconductors, present scaling laws for the magnet parameters and discuss relative advantages of the underlying triplet layouts. CC-BY publication JACoW CERN EDS SIS PAC05-2006 SIS:2006 PR/LKR added SIS CARE2006 SIS ARC-PR-2007 CLAS1 LHC-PROJECT-REPORT SzGeCERN Accelerators and Storage Rings CERN LHCPROJECTREPORT ARTICLE CERN LHC Not applicable Catalan-Lasheras, Nuria Kirby, Glyn Russenschuck, Stephan AUTHOR|(CDS)2070496 #BEARD# LHC https://accelconf.web.cern.ch/p05/PAPERS/MPPT043.PDF Published version from JACoW http://documents.cern.ch/archive/electronic/other/uploader/CARE/Conf/care-conf-05-005.pdf Access to fulltext document http://documents.cern.ch/cgi-bin/setlink?base=preprint&categ=cern&id=lhcproj-2005-835 Access to fulltext document http://cds.cern.ch/record/865941/files/care-conf-05-005.pdf Access to fulltext document http://cds.cern.ch/record/865941/files/lhc-project-report-835.pdf Access to fulltext document evelyne.delucinge@cern.ch CERN n 200531 a2005 13 20100901 1606 CER01 20050805 719664 2795 knoxville20050516 PUBLIC 002544816CER ARTICLE ConferencePaper 002610318CER01 865940 SzGeCERN 20240223161608.0 oai:cds.cern.ch:865940 cerncds:FULLTEXT cerncds:CERN:FULLTEXT INIS cerncds:CERN SPIRES 6545009 Inspire 703803 LHC-Project-Report-834 eng CERN-LHC-Project-Report-834 Parma, V Short Straight Sections in the LHC Matching Sections (MS SSS) An Extension of the Arc Cryostats to Fulfil Specific Machine Functionalities 2005 Geneva CERN 11 Jul 2005 4 p The LHC insertions require 50 specific superconducting quadrupoles in the matching sections, operating either in 1.9 K superfluid helium or in boiling helium at 4.5 K. These magnets are assembled together with corrector magnets in cold masses, and are inserted in individual cryostats to form the MS Short Straight Sections (MS SSS). The variety of quadrupoles and corrector magnets leads to 10 families of cold masses, with lengths ranging from 5 to 12 m and weights ranging from 60 to 140 kN. The MS SSS need to fulfil specific requirements related to the collider topology, its cryogenic layout and the powering scheme. Most MS SSS are standalone cryogenic and super-conducting units, i.e. they are not in the continuous arc cryostat, and therefore need dedicated cryogenic and electrical feeding. Specially designed cryostat end-caps are required to close the vacuum vessels at each end, which include low heat in-leak Cold-to-Warm transitions (CWT) for the beam tubes and 6 kA local electrical feedthrough for powering the quadrupoles. This paper presents the design of the MS SSS cryostats as an extension of the arc cryostat's design [1-3], to achieve a standard and consequently cost-effective solution, and the design solutions chosen to satisfy their specific functionalities. CC-BY publication JACoW CERN EDS SIS:2006 PR/LKR added SIS PAC05-2006 SIS ARC-PR-2007 CLAS1 LHC-PROJECT-REPORT SzGeCERN Accelerators and Storage Rings CERN LHCPROJECTREPORT ARTICLE CERN LHC Not applicable Prin, H Lutton, F LHC http://documents.cern.ch/cgi-bin/setlink?base=preprint&categ=cern&id=lhcproj-2005-834 Access to fulltext document https://accelconf.web.cern.ch/p05/PAPERS/WPAE021.PDF Published version from JACoW http://cds.cern.ch/record/865940/files/lhc-project-report-834.pdf Access to fulltext document evelyne.delucinge@cern.ch CERN IPN, Orsay, France n 200531 a2005 13 20100901 1606 CER01 20050805 719664 1724 knoxville20050516 PUBLIC 002544815CER ARTICLE ConferencePaper 002595823CER01 865939 SzGeCERN 20240223161607.0 oai:cds.cern.ch:865939 cerncds:FULLTEXT cerncds:CERN:FULLTEXT INIS cerncds:CERN SPIRES 6501567 Inspire 702302 LHC-Project-Report-833 eng CERN-LHC-Project-Report-833 Parma, Vittorio AUTHOR|(CDS)2068042 #BEARD# The Assembly of the LHC Short Straight Sections (SSS) at CERN Project Status and Lessons Learned 2005 Geneva CERN 11 Jul 2005 4 p The series production of the LHC SSS has started in the beginning of 2004 and is foreseen to last until end 2006. The production consists in the assembly of 474 cold masses housing superconducting quadrupoles and corrector magnets within their cryostats. 87 cold mass variants, resulting from various combinations of main quadrupole and corrector magnets, have to be assembled in 55 cryostat types, depending on the specific cryogenic and electrical powering schemes required by the collider topology. The assembly activity features the execution of more than 5 km of leak-tight welding of stainless steel and aluminium cryogenic lines, designed for 20-bar pressure, according to high qualification standards and undergoing severe QA inspections. Some 2500 leak detection tests, using He mass spectrometry, are required to check the tightness of the cryogenic circuits. Extensive electrical control work, to check the integrity of the magnet instrumentation and electrical circuits throughout the assembly of the SSS, is also carried out. This paper presents the current status of production, the assembly facilities at CERN, work organisation and Quality Assurance issues, and the acquired assembly experience after one and a half years of production. CC-BY publication JACoW CERN EDS SIS PAC05-2006 SIS:2006 PR/LKR added SIS ARC-PR-2007 CLAS1 LHC-PROJECT-REPORT SzGeCERN Accelerators and Storage Rings CERN LHCPROJECTREPORT ARTICLE CERN LHC Not applicable Bourcey, Nicolas Dos Santos de Campos, Paulo M Feitor, Rogerio C Gandel, Makcim López, R Schmidlkofer, Martin Slits, Ivo LHC http://documents.cern.ch/cgi-bin/setlink?base=preprint&categ=cern&id=lhcproj-2005-833 Access to fulltext document https://accelconf.web.cern.ch/p05/PAPERS/MPPT045.PDF Published version from JACoW http://cds.cern.ch/record/865939/files/lhc-project-report-833.pdf Access to fulltext document evelyne.delucinge@cern.ch CERN SSS n 200531 a2005 13 20100901 1606 CER01 20050805 719664 2890 knoxville20050516 PUBLIC 002544814CER ARTICLE ConferencePaper 865938 SzGeCERN 20230531152400.0 oai:cds.cern.ch:865938 cerncds:FULLTEXT cerncds:CERN:FULLTEXT INIS cerncds:CERN SPIRES 6501524 Inspire 702298 LHC-Project-Report-832 eng CERN-LHC-Project-Report-832 Seyvet, Fabien Improvement of the Geometrical Stability of the LHC cryodipoles when Blocking the Central Support Post 2005 Geneva CERN 11 Jul 2005 4 p revised version submitted on 2005-09-01 15:34:21 The LHC will be equipped with 1232 horizontally curved 16 meter long super-conducting dipole magnets cooled at 1.9 K, supported within their vacuum vessel by three Glass Fiber Resin Epoxy (GFRE) support posts. The two support posts at the dipole extremities were initially designed free to slide longitudinally with respect to the vacuum vessel and the central support post free to slide transversely. However the magnet shape did not retain the tight geometrical tolerances, of the order of fractions of mm, imposed by machine aperture and magnetic corrector centering requirements. Thereafter a modification to the supporting system, removing the initial transversal degree of freedom of the lower flange of the central support post with respect to the vacuum vessel, was designed and implemented. This paper describes the design of the magnet/cryostat interface with and without blockage of the central support post, analyzes the additional mechanical loads related to the modification and reviews the experimental results with respect to the requirements for beam aperture and magnetic corrector centering. CERN EDS SIS PAC05-2006 SIS:2006 PR/LKR added SIS ARC-PR-2007 CLAS1 LHC-PROJECT-REPORT SzGeCERN Accelerators and Storage Rings CERN LHCPROJECTREPORT ARTICLE CERN LHC Not applicable Beauquis, Jerome Fernandez-Cano, Elena D Jeanneret, Jean Bernard Poncet, Alain Tommasini, Davide AUTHOR|(CDS)2069265 #BEARD# LHC http://documents.cern.ch/cgi-bin/setlink?base=generic&categ=public&id=cer-002544813 Access to fulltext document http://cds.cern.ch/record/865938/files/cer-002544813.pdf Access to fulltext document evelyne.delucinge@cern.ch CERN n 200531 a2005 13 20100901 1606 CER01 20050805 719664 2675 knoxville20050516 PUBLIC 002544813CER ARTICLE ConferencePaper 865948 SzGeCERN 20240223161610.0 oai:cds.cern.ch:865948 cerncds:FULLTEXT cerncds:CERN:FULLTEXT cerncds:CERN Inspire 690747 CERN-AT-2005-012-ACR eng Claudet, Serge Recent Progress in Power Refrigeration below 2 K for Superconducting Accelerators 2005 Geneva CERN 15 Jul 2005 6 p As a result of technico-economical optimization and quest for increased performance, 2 K cryogenics is now present in large accelerator projects using superconducting magnets or acceleration cavities. Consequently, large cryogenic systems producing refrigeration capacity below 2 K in the kW range and with high efficiency over a large dynamic range are needed. After CEBAF and SNS, this is the case for the Large Hadron Collider (LHC) project at CERN for which eight 2.4 kW @ 1.8 K refrigeration units are needed to cool each a 3.3 km long sector of high-field magnets. Combining cold hydrodynamic compressors in series with warm volumetric compressors, complete pre-series units as well as sets of series cold compressors have been intensively tested and validated from two different industrial suppliers. After recalling the possible 2 K refrigeration cycles and their comparative merits, this paper describes the specific features of the LHC system and presents the achieved performance with emphasis on the progress in terms of efficiency, operational compliance, reliability and maintenance. Perspectives of application to a future International Linear Collider (ILC) based on cold RF technology are then briefly evoked. CC-BY publication JACoW CERN EDS SIS PAC05-2006 SIS:2006 PR/LKR added UNCL SzGeCERN Accelerators and Storage Rings ARTICLE CERN AT http://documents.cern.ch/cgi-bin/setlink?base=preprint&categ=cern&id=at-2005-012 Access to fulltext document https://accelconf.web.cern.ch/p05/PAPERS/ROAD001.PDF Published version from JACoW http://cds.cern.ch/record/865948/files/at-2005-012.pdf Access to fulltext document evelyne.delucinge@cern.ch CERN n 200531 a2005 13 20070503 1018 CER01 20050805 719664 9 knoxville20050516 PUBLIC 002544832CER ARTICLE ConferencePaper 865947 SzGeCERN 20240223161610.0 oai:cds.cern.ch:865947 cerncds:FULLTEXT cerncds:CERN:FULLTEXT INIS cerncds:CERN SPIRES 6551092 Inspire 704091 LHC-Project-Report-840 eng CERN-LHC-Project-Report-840 Rathjen, Christian Ultrathin Polyimide-Stainless Steel Heater for Vacuum System Bake-out 2005 Geneva CERN 11 Jul 2005 4 p Space constraints in several normal conducting magnets of the LHC required the development of a dedicated permanent heater for vacuum chamber bake-out. The new heater consists of stainless steel bands inside layers of polyimide. The overall heater thickness is about 0.3 mm. The low magnetic permeability is suitable for applications in magnetic fields. The material combination allows for temperatures high enough to activate a NEG coating. Fabrication is performed in consecutive steps of tape wrapping. Automation makes high volume production at low costs possible. About 800 m of warm vacuum system of the long straight sections of the LHC will be equipped with the new heater. This paper covers experience gained at CERN from studies up to industrialization. CC-BY publication JACoW CERN EDS SIS PAC05-2006 SIS:2006 PR/LKR added SIS ARC-PR-2007 CLAS1 LHC-PROJECT-REPORT SzGeCERN Accelerators and Storage Rings LHCPROJECTREPORT ARTICLE CERN CERN LHC Not applicable Blanchard, Sebastien Henrist, Bernard Kölemeijer, Wilhelmus Libera, Bruno Lutkiewicz, Przemyslaw LHC http://documents.cern.ch/cgi-bin/setlink?base=preprint&categ=cern&id=lhcproj-2005-840 Access to fulltext document https://accelconf.web.cern.ch/p05/PAPERS/RPPE043.PDF Published version from JACoW http://cds.cern.ch/record/865947/files/lhc-project-report-840.pdf Access to fulltext document evelyne.delucinge@cern.ch CERN n 200531 a2005 13 20100901 1606 CER01 20050805 719664 2744 knoxville20050516 PUBLIC 002544825CER ARTICLE ConferencePaper