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Europa Metalli -LMI, in the framework of the NET-ITER project on thermocontrolled nuclear fusion, has developed and optimized the fabrication technology for internal t i n multifilamentary Nb3Sn strands. The ITER project technical specifications require strands with high critical currents (700 A/mm2) associated with low hysteresis losses (< 600 mJ/cm3 -3 + 3 T). Modifications to the conductor lay-out were gradually carried out during development of the strands thus maintaining the high critical currents and reducing the losses. Current densities of 850 A / m m 2 with losses of 550 mJlcm3 were reached. Furthermore, the manufacturing technology developed by Europa Metalli -LMI enables industrial unit lengths greater than 1 Kilometre to be obtained. This paper reports activities which have led to the manufacturing of' the conductor fulfilling ITER specifications.

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