Progress of manufacturing CS and EF Coils for the JT-60SA Tokamak

Tsuchiya, Katsuhiko; Murakami, Haruyuki; Kizu, Kaname; Koide, Yoshihiko; Yoshida, Kiyoshi

The programme of constructing JT-60SA tokamak is progressing under the framework of the Broader Approach project. JT-60SA has the superconducting magnet system has Poloidal field (PF) coils and Toroidal field (TF) coils. PF coil system, of which JAEA is in charge, has a central solenoid (CS) with four solenoid modules and six equilibrium field (EF) coils. A CS module has 549 turns of NbSn superconducting conductor, and its scale is 2 m in diameter. EF coils, which are made of NbTi superconducting conductor, consist of the circular coils with various bores, ranging from 4.4 m to 12 m in diameter. Before real CS module was made, a model coil which consisted of a real size quad-pancake had been manufactured to check its performance at 5.5K. After it was confirmed, winding of real CS modules was started. Recently, all pancake coils of the first module of CS, CS1, was completed. CS1 will be tested at 5.5K just before completion. EF coils are manufactured at the on-site facility in JAEA Naka because these are too large to transport on the public road. Three EF coils, EF4, EF5 and EF6 were already completed and installed on the cryostat base in the torus hall in January 2014. These coils were manufactured with the great accuracy. Errors of current centre of the winding packs were within 0.6 mm (EF4 and EF5) and 1.3 mm (EF6) which were only 1/6 to 1/10 of the required tolerances. From summer in the last year, manufacturing of the remaining EF coils was started.