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G. Trokhachev , 0. F i latov D.V.Efremov Institute of Electrophysical Apparatus, 1 8 9 6 3 1 , St.Petersburg, Russia dbstract--Problems of manufacturing wires for the ITER magnetic system are considered. Results for Nb3Sn wires 0.80-0.85mm in dia manufactured using bronze technology under commercial conditions are gilen. Wires containing up to 15,000 filaments with volume fractions of copper stabilizer up to 56%, chromium coatings 2 pm thick and having critical current densities (non CUI up to 650 A/mm2 (12T, 4 . 2 K ) are discussed. Wires with extended tin sources and volume fractions of copper stabilizer equal to 60% are investigated. Jc (non CUI for such wires 0.85 mm in dia reaches 1000 A/mm2 (12T, 4.2K) with hysteresis losses <550d/cm3.

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