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International audienceThe new particle accelerator project Spiral 2 at GANIL (“Grand Accélérateur d’Ions Lourds, i.e. NationalLarge Heavy Ion Accelerator) in Caen (France) is a very large installation, intended to serve fundamental research innuclear physics. The heart of the future machine features a superconductor linear accelerator, delivering a beam until20Mev/A, which are then used to bombard a matter target. The resulting reactions, such as fission, transfer, fusion, etc.will generate billions of exotic nuclei. To achieve acceleration of the beam, 26 cavities which are placed insidecryomodules at helium cryogenic temperature will be used. AL-AT (Air Liquide Advanced Technologies) takes part tothe project by supplying cryogenic plant. The plant includes the liquefier associated to its compressor station, a largedewar, a storage tank for helium gas and transfer lines. In addition, a helium recovery system composed of recoverycompressor, high pressure storage and external purifier has been supplied. Customized HELIAL LF has been designed,manufactured and tested by AL-AT to match the refrigeration power need for the Spiral 2 project which is around 1300W equivalent at 4.5 K

NEUROSPIN, a CEA Life Science Division laboratory located in Saclay, France, uses superconducting magnets for MRI applications. The aim of this lab, unique imaging platform in Europe, is to study the central nervous system. Several superconducting magnets will be operated, among which a 11.75 T magnet (Collaboration between Siemens healthcare and CEA within the framework of the french-german project Iseult/INUMAC, supported in part by Oséo, a public and autonomous establishment created by the French governement) [1] which needs 1.8K refrigeration, and specific thermal shielding.AIR LIQUIDE DTA was in charge of the design and manufacturing of a specific Helium Refrigerator dedicated to this application. This system, based on a HELIAL Evolution refrigeration system, HELIAL MF, has to be able to provide in nominal configuration simultaneously refrigeration power at 4.5K (to compensate heat losses), liquefaction rate (to supply 1.8K refrigeration system with liquid helium) and refrigeration power at 50K (shielding of the magnet).The Refrigeration system has been completed and tested successfully at AIR LIQUIDE Factory at the end of 2010.The aim of this paper is to present the main technical features of the overall cryogenic system and the main results of the commissioning phase of the refrigerator.

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