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In the framework of the JT-60SA project, aiming at upgrading the present JT-60U tokamak toward a fully superconducting configuration, the detailed design phase led to adopt for the three main magnet systems a brand new design. Europe (EU) is expected to provide to Japan (JA) the totality of the toroidal field (TF) magnet system, while JA will provide both Equilibrium field (EF) and Central Solenoid (CS) systems. All magnet designs were optimized trough the past years and entered in parallel into extensive experimentally-based phases of concept validation, which came to maturation in the years 2009 and 2010. For this, all magnet systems were investigated by mean of dedicated samples, e.g. conductor and joint samples designed, manufactured and tested at full scale in ad hoc facilities either in EU or in JA. The present paper, after an overall description of magnet systems layouts, presents in a general approach the different experimental campaigns dedicated to qualification design and manufacture processes of either coils, conductors and electrical joints. The main results with the associated analyses are shown and the main conclusions presented, especially regarding their contribution to consolidate the triggering of magnet mass production. The status of respective manufacturing stages in EU and in JA are also evoked.

The JT-60SA is an advanced tokamak device under construction, which addresses key physics issues for ITER and DEMO. The emphasis of JT-60SA's research aims is to extend the reactor-relevant plasma pulse length towards steady state, thus the superconducting magnet is introduced for the plasma confinement. The construction of the magnet system is in progress under the collaboration between Japan and Europe. For example, manufacturing/installation of the toroidal field coils is split primarily between sites in Italy (conductor cabling and jacketing, casings fabrication, coil winding and integration), France (support structures, coil winding and integration and eventual cold testing) and Japan (on-site installation). This paper overviews the progress in the manufacturing of the JT-60SA magnet system, highlighting the engineering solutions that have been adopted. Progress in the superconducting magnet systemThe superconducting magnet system consists of 18 toroidal field (TF) coils, a central solenoid (CS) with 4 modules, 6 equilibrium field (EF) coils (figure 1), as well as high temperature superconductor current leads (HTS CLs), and electrical

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