Present status of design and manufacture of the superconducting magnets for the Large Helical Device

Author

Satow, T. ; Yamamoto, J. ; Takahata, K. ; Imagawa, S. ; Tamura, H. ; Yanagi, N. ; Mito, T. ; Nishimura, A. ; Satoh, S. ; Yamazaki, K. ; Kaneko, H. ; Yonezu, H. ; Hayashi, H. ; Takeo, M. ; Motojima, O.

Author_Institution

Nat. Inst. for Fusion Sci., Nagoya, Japan

Volume

3

Issue

1

fYear

1993

fDate

3/1/1993 12:00:00 AM

Firstpage

365

Lastpage

368

Abstract

The Large Helical Device (LHD) is a nuclear fusion experimental device with superconducting magnets. Manufacture of the cryostat, the inner vertical coils, and the helical-coil winding machine are now being carried out. Designs for constructing two helical coils and two other pairs of poloidal coils are in progress. The outside diameter of the torus-shaped cryostat is 13.5 m. There are two operational stages for the LHD. Phase I and Phase II. The helical coils will have a magnetic energy of 1.6 GJ and an overall current density of 53 A/mm/sup 2/ in Phase II. The rated current is 13.0 kA in Phase I, and the maximum magnetic field in the helical coil winding in Phase I was calculated to be 6.9 T. Three pairs of poloidal coils are cooled by forced-flow supercritical helium because of the necessity of having no metal coil vessel. The rated current of one inner vertical (IV) poloidal coil is 20.8 kA, and its stored energy is 80 MJ. The maximum magnetic field of the two IV coils was calculated to be 5.8 T. The type of superconductor for the IV coils is a cable-in-conduit conductor.<>

Keywords

cryostats; fusion reactor theory and design; superconducting magnets; winding (process); 1.6 GJ; 13 kA; 13.5 m; 20.8 kA; 5.8 T; 6.9 T; 80 MJ; Large Helical Device; NbTi; cable-in-conduit conductor; cryostat manufacture; current density; forced flow supercritical He; helical-coil winding machine; magnetic field; nuclear fusion experimental device; poloidal coils; superconducting magnets; torus-shaped cryostat; Conductors; Current density; Fusion reactors; Machine windings; Manufacturing; Superconducting cables; Superconducting coils; Superconducting magnets; Toroidal magnetic fields;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/77.233469

Filename

233469