29th Symposium on Fusion Technology (SOFT 2016)

P2.085 Completion of manufacturing of equilibrium field coils for the JT-60SA tokamak

Sep 6, 2016, 2:20 PM

1h 40m

Foyer 2A (2nd floor), 3A (3rd floor) (Prague Congress Centre)

Board: 85

Poster E. Magnets and Power Supplies P2 Poster session

Speaker

Katsuhiko Tsuchiya (QST)

Description

The programme of constructing JT-60SA device is progressing as a satellite tokamak of the Broader Approach project. JT-60SA has superconducting poloidal field (PF) coil system which is procured by JAEA, and 18 D-shaped toroidal field (TF) coils of which Europe has been in charged. PF coil system consists of a central solenoid (CS) with four solenoid modules and six circular coils which are utilized to produce the plasma equilibrium field (EF). Each of EF coil has individual diameters, 4.5 to 12 m. Fabrication of EF coil was started from EF4 which is set at the lowermost of torus in the beginning of 2009. EF5 and EF6 coils will be installed lower side of tokamak, so that these coils had to be preferentially manufactured before the setting of vacuum vessel was started. In the end of 2013, these 3 EF coils were completed and temporally set on the cryostat base. Now these coils are waiting for setting on the TF coils after these coils are fully installed. For the circular coils such as EF coils, circularity is very important issue to sustain the plasma with high performance. For EF4, EF5 and EF6 coils, the final circularities of winding pack were 1/6 to 1/10 smaller than the design tolerance that was calculated from the allowable error field to control plasmas. From summer 2014, EF1, EF2, and EF3 coils were started to be manufactured and will be completed by the end of summer 2016. Then, all the superconducting EF coils are finally manufactured. So far, the circularitiy of EF2 (9.2 m in diameter) is clear, 0.4 mm. This value is 1/15 of the design tolerance. It is expected that great accuracy of manufacturing will be successfully kept until completion of manufacturing.