Fabrication and installation of equilibrium field coils for the JT-60SA

Recently, fabrication of the first superconducting coil in JT-60SA tokamak (EF4 coil) was finished. EF4 coil has ten double pancake (DP) coils. All DP coils were stacked up to form the winding pack. In order to check the manufacturing error of DP coils, their circularities (in-plane ellipticities) w...

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Bibliographic Details
Published in:Fusion engineering and design 2013-10, Vol.88 (6-8), p.551-554
Main Authors: Tsuchiya, Katsuhiko, Kizu, Kaname, Murakami, Haruyuki, Kashiwa, Yoshitoshi, Yoshizawa, Norio, Yoshida, Kiyoshi, Hasegawa, Mitsuru, Kuno, Kazuo, Nomoto, Kazuhiro, Horii, Hiroyuki
Format: Article
Language:English
Subjects:
Bars
Circularity
Coils (windings)
Current center
EF coil
Errors
JT-60SA
Manufacturing error
Position measurement
Superconducting coil system
Superconductivity
Tokamak devices
Winding
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Summary:Recently, fabrication of the first superconducting coil in JT-60SA tokamak (EF4 coil) was finished. EF4 coil has ten double pancake (DP) coils. All DP coils were stacked up to form the winding pack. In order to check the manufacturing error of DP coils, their circularities (in-plane ellipticities) were evaluated for all DP coils. Positions of conductors for each DP coil were measured before curing process. Error bars of the current centers, which were used for the index for DP coil's circularity, ranged between 1.1 and 2.5mm. During stacking the DP coils, the positions of these coils were optimized in order to cancel the error of circulation of the winding pack. As the result, the manufacturing error of the radial current center was achieved 0.6mm for the winding pack. This value was an order of magnitude smaller than the required manufacturing error of EF4 coil.
ISSN:0920-3796
1873-7196
DOI:10.1016/j.fusengdes.2013.02.096