engBurgmer, RDurante, MKlein, HKrischel, DPeyrot, MRifflet, J MSchellong, BSchirm, K MSchmidt, PSimon, FStephani, TTortschanoff, TheodorVenturini-Delsolaro, WPerformance of the First LHC Main Quadrupoles Made in IndustryAccelerators and Storage RingsLHC-Project-Report-661CERN-LHC-Project-Report-661After the creation of a new dedicated factory and a period of technology transfer, ACCEL Instruments has constructed and delivered the first LHC main quadrupole magnets to CERN. The design of these magnets had been the subject of a close collaboration between CEA-Saclay and CERN. Thus, CEA ensures also the technology follow-up for the fabrication of 400 quadrupole magnets and their cold masses. The two quadrupoles delivered to CERN were bare magnets, i.e. magnets not integrated into their cold masses. The purpose was to verify their performance before fabricating full cold masses. The two magnets were tested at 1.9 K in a vertical cryostat at CERN. For both magnets the current could be ramped up to well above their nominal level before a quench occurred. The second powering provoked on one of the magnets a quench at the ultimate level of excitation and in the other magnet no quench, even after the ultimate current value had been well exceeded. The field quality measurements, as far as possible in the vertical cryostat, confirmed the multipole content already found during the warm field measurements made in the factory.2003-07-15http://cds.cern.ch/record/630342http://cds.cern.ch/record/630342oai:cds.cern.ch:630342 engVanenkov, IVöllinger, CInfluence of Azimuthal Coil Size on Skew Multipoles in the LHC DipolesAccelerators and Storage RingsLHC-Project-Report-662CERN-LHC-Project-Report-662The field quality in superconducting accelerator magnets is strongly influenced by the azimuthal dimension of the superconducting coil. Asymmetries between the upper and lower poles steer skew harmonics that can endanger the beam dynamics stability. We present dimensional measurements of a large number of coils that have been carried out in one of the three manufacturers of the main LHC dipoles. A magneto-static model is then used to work out the influence of coil non-nominalites on field harmonics. Comparison to magnetic measurements carried out at room temperature shows that skew harmonics can be partly traced back to azimuthal coil dimensions. We focus on harmonics, which are more critical with respect to the beam dynamics limits (a2 and a4). Finally some strategies are presented, like the sorting of individual coil poles in order to reduce the detrimental effects on these multipoles.2003-07-15http://cds.cern.ch/record/630343http://cds.cern.ch/record/630343oai:cds.cern.ch:630343 engRossi, LThe LHC Superconducting MagnetsAccelerators and Storage RingsLHC-Project-Report-660CERN-LHC-Project-Report-660The Large Hadron Collider (LHC) is under construction at CERN. Most of its 27 km underground tunnel will be filled with superconducting magnets, mainly 15 m long dipoles and 3 m long quadrupoles. The 1232 main dipole and 392 main quadrupole magnets, are complemented by a number of insertion quadrupole magnets: including 86 MQM (matching), 26 MQY (wide aperture) and 32 low-beta quadrupoles (the latter built by KEK and Fermilab). The about 6000 superconducting corrector magnets, many of them individually powered, are also very critical for the functioning of the accelerator. Using copper stabilized NbTi Rutherford cables or single strands, these superconducting magnets will operate in superfluid helium at 1.9 K. The paper reviews the main characteristics of these magnets and addresses the critical points of the design with respect to their use in such a complicated accelerator like LHC. Then the status of the production of the superconducting cable and of the magnets is given, with particular emphasis given to the QA/QC procedures taken to ensure the industrial production according to the tight requirements, and the results on the first 30 main dipoles is presented. Finally, the plan put in place to meet the LHC schedule is discussed.2003-07-15http://cds.cern.ch/record/630341http://cds.cern.ch/record/630341oai:cds.cern.ch:630341 engScandale, WalterBottura, LDevred, ArnaudRemondino, VittorioSanfilippo, STodesco, EzioVöllinger, CWildner, EControlling Field Quality in Magnet ProductionAccelerators and Storage RingsLHC-Project-Report-659CERN-LHC-Project-Report-659The field quality measurements at room temperature of around 100 collared coils of the main LHC dipoles are analysed. Using correlations to field measurements at 1.9 K, comparison with beam dynamics limits are discussed. Both random and systematic components are analysed, allowing to pin out the most critical multipoles. Corrective actions that have been taken during the pre-series phase are presented; we focus on the low order systematic multipoles that are shown to be the most difficult components to steer. A preliminary analysis of the integrated main field and of its implications on the possible scenarios for the installation are also carried out.2003-07-15http://cds.cern.ch/record/630340http://cds.cern.ch/record/630340oai:cds.cern.ch:630340 engModena, MBajko, MCornelis, MFessia, PMiles, JPugnat, PRinn, Jde Rijk, GSavary, FSiemko, ATodesco, EzioVlogaert, JStatus of the LHC Main Dipole Pre-Series ProductionAccelerators and Storage RingsLHC-Project-Report-658CERN-LHC-Project-Report-658The procurement of a pre-series of 90 main dipoles was decided as the first step towards the series production of 1232 arc main dipoles within the LHC magnet program. The pre-series production is already completed at one contractor's site and is approaching the completion at the other two companies. Technical aspects: manufacturing tolerances, manufacturing difficulties, first evaluation on non-conformities appearing during production and a short overview of magnet performance are presented.2003-07-15http://cds.cern.ch/record/630339http://cds.cern.ch/record/630339oai:cds.cern.ch:630339