Nisbet, D.

Paper	Title	Page
MOPAN082	Four Quadrant 120 A, 10 V Power Converters for LHC	347
	Y. Thurel, B. Favre, D. Nisbet CERN, Geneva
	The LHC (Large Hadron Collider) particle accelerator makes extensive use of true bipolar power converters, with a regulated high precision output current requirement. A special design and topology is required to permit high performance throughout the converter operating area, including quadrant transition. This paper presents the 120A 10V power converter, well represented in the LHC (300 units). The design is adapted for a wide range of magnet loads [from 10mH to 4 Henry] with stringent EMC requirements. A quick-connect system was applied to the converter modules to allow easy installation and maintenance operations. Discussion of 4 quadrant control and practical results are presented.
FROAC03	The Commissioning of the LHC Technical Systems	3801
	R. I. Saban, R. Alemany-Fernandez, V. Baggiolini, A. Ballarino, E. Barbero-Soto, B. Bellesia, F. Bordry, D. Bozzini, M. P. Casas Lino, V. Chareyre, S. D. Claudet, G.-J. Coelingh, K. Dahlerup-Petersen, R. Denz, M. Gruwe, V. Kain, G. Kirby, M. Koratzinos, R. J. Lauckner, S. L.N. Le Naour, K. H. Mess, F. Millet, V. Montabonnet, D. Nisbet, B. Perea-Solano, M. Pojer, R. Principe, S. Redaelli, A. Rijllart, F. Rodriguez-Mateos, R. Schmidt, L. Serio, A. P. Siemko, M. Solfaroli Camillocci, H. Thiesen, W. Venturini Delsolaro, A. Vergara-Fernandez, A. P. Verweij, M. Zerlauth CERN, Geneva SF. Feher, R. H. Flora, R. Rabehl Fermilab, Batavia, Illinois
	The LHC is an accelerator with unprecedented complexity; in addition, the energy stored in magnets and the beams exceeds other accelerators by one to two orders of magnitude. To avoid a plague of technical problems and ensure a safe machine start-up, the hardware commissioning phase was emphasized: the thorough commissioning of technical systems (vacuum, cryogenics, quench protection, power converters, electrical circuits, AC distribution, ventilation, demineralised water, injection system, beam dumping system, beam instrumentation, etc) is carried-out without beam. Activity started in June 2005 with the commissioning of individual systems, followed by operating a full sector of the machine as a whole. LHC architecture allows the commissioning of each of the eight sectors independently from the others, before the installation of other sectors is complete. Important effort went into the definition of the programme and the organization of the coordination in the field, as well as in the tools to record and analyze test results. This paper presents the experience with this approach, results from the commissioning of the first LHC sectors and gives an outlook for future activities.
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