Japanese contribution to the construction of the ITER superconducting magnet system is to procure 25% of TF conductors, about half of TF coil winding packs, all of TF coil structures and all of CS conductors. JAEA has started extensive technology development for the preparation of these procurements. These include (1) trial fabrication of the superconductors at industry level and their performance demonstration, (2) manufacturing studies on the TF coil winding pack and structures, (3) full-scale trial fabrication of TF coil structures, and (4) establishment of database on the structural materials. All of these activities are performed in tight collaboration with Japanese industry involving around 20 major companies. Up to date, advanced Nb 3 Sn strands have been developed, manufacturing studies on the TF coil winding and structures have been performed, and trial manufacture of structural materials at full scale has been performed. All of these results are satisfactory, although further technology development is required in some areas, including the qualification of conductors and establishment of welding procedures of structures.
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