AC loss measurements of the experiments on a single inner vertical coil (EXSIV) for the Large Helical Device

Author

Mito, T. ; Takahata, K. ; Iwamoto, A. ; Maekawa, R. ; Yanagi, N. ; Satow, Tetsu ; Sumiyoshi, F. ; Kawabata, Shogo ; Hirano, Naoki

Author_Institution

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

Volume

7

Issue

2

fYear

1997

fDate

6/1/1997 12:00:00 AM

Firstpage

330

Lastpage

334

Abstract

The AC losses of the Inner Vertical (IV) coil have been measured during the Experiments on a Single Inner Vertical coil (EXSIV). The IV coils are the smallest poloidal coils of the Large Helical Device (LHD) and their inner and outer diameters are 3.2 m and 4.2 m, respectively. The coil consists of 16 pancake coils wound with the cable-in-conduit conductors (CICC) whose strands are NbTi/Cu without any surface coating. The AC losses were measured with a calorimetric method during excitation tests and current shut-off tests. In addition to the usual inter-strand coupling losses with short time constants, unexpected coupling losses were observed due to the coupling current of a long time constant.

Keywords

calorimetry; loss measurement; losses; stellarators; superconducting coils; superconducting machines; 3.2 m; 4.2 m; AC loss measurements; EXSIV; Large Helical Device; NbTi/Cu; NbTiCu; cable-in-conduit conductors; calorimetric method; coupling current; coupling losses; current shut-off tests; excitation tests; inter-strand coupling losses; pancake coils; single inner vertical coil; Coatings; Conductors; Copper; Current measurement; Electromagnetic measurements; Large-scale systems; Loss measurement; Superconducting coils; Testing;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/77.614497

Filename

614497