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.