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MAGNET DEVELOPMENT AND INSTRUMENTATION 2009Status report of the 42+ Tesla hybrid magnet projectFor a given electrical power installation, the highest continuousmagnetic fields are obtained with hybrid magnets, i.e.the combination of a resistive inner coil with a superconductingouter one. The base-line for the coil sub-assembliesof the hybrid magnet under construction at LNCMI-G, isgiven in table together with magnetic field contributions.One of the particularities of this design is to use poly-helixcoil for the innermost part of the resistive insert. The fieldproduced by the poly-helix and Bitter coils are planned tobe further increased, typically up to 36 − 37 T, for the upgradephase of this project.Hybrid componentsField (baseline)14 series connected helix coils 24.5 T2 series connected Bitter coils 9 T1 superconducting pancake coil 8.5 TTable 2: Subparts of the 42+ Tesla hybrid magnet.The already existing infrastructure of the hybrid magnet hasfixed the maximum dimensions of the superconducting coil,which are listed in table 2 together with the other main parameters.A schematic view of the cryogenics circuits isshown in figure 176. A new helium liquefier producing upto 130 l/h is necessary for the hybrid magnet project as theestimated consumptions in equivalent liquid He at 4.5 Kwith and without magnet energisation are equal to 100 l/hand 65 l/h respectively.Extensive tests performed in collaboration with the CEA-Saclay and industrial partners have allowed the validationof the conceptual study as well as the preparation of theindustrialization processes.CharacteristicsValuesInner/outer radius550/913 mmHeight1400 mmInductance3 HNominal current (8.5 T)7100 AStored Energy76 MJOperating Temperature1.8 KTable 3: Main parameters of the superconducting coil.Figure 176:: Simplified cryogenic process flow diagramThe specification of the superconducting Rutherford Cableon Conduit Conductor (RCOCC) has been prepared and reviewed.The call for tender was issued and the contract forthe production of all unit lengths of the Nb-Ti/Cu Rutherfordcable (∼ 11 km) was signed at the end of 2009.W. Joss, R. Pfister, P. Pugnat, L. RonayetteC. Berriaud, A. Daël, P. Fazilleau, B. Hervieu, F.P. Juster, C. Mayri, J.M. Rifflet (CEA-Saclay, Gif-sur-Yvette, France)A. Bourquard, D. Bresson, (Alstom, Belfort, France)124