Excitation test results on a single inner vertical coil for the Large Helical Device

Author

Takahata, K. ; Mito, T. ; Satow, T. ; Nishimura, Akira ; Yamada, S. ; Chikaraishi, H. ; Yanagi, N. ; Iwamoto, A. ; Maekawa, R. ; Imagawa, S. ; Tamura, H. ; Yamaguchi, S. ; Satoh, S. ; Tanahashi, S. ; Yamazaki, K. ; Yamamoto, J. ; Motojima, O. ; Kai, T. ;

Author_Institution

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

Volume

7

Issue

2

fYear

1997

fDate

6/1/1997 12:00:00 AM

Firstpage

477

Lastpage

480

Abstract

Excitation experiments on a single inner vertical coil for the Large Helical Device (LHD) were carried out to confirm its performance. The coil is one of the LHD´s poloidal field coils and consists of a forced-flow Nb-Ti cable-in-conduit conductor (CICC). After cooldown for 250 hours, the superconducting transition of the whole coil was confirmed. Pressure drops were measured during the cooldown to determine the coil´s hydraulic characteristics. Then, the coil was successfully energized up to the specified current, 20.8 kA. In the experiments, heat generation of joints, radial displacement and acoustic emission (AE) were measured.

Keywords

acoustic emission; fusion reactor design; fusion reactor materials; fusion reactors; superconducting cables; superconducting coils; superconducting magnets; 20.8 kA; 250 h; LHD; Large Helical Device; Nb-Ti; acoustic emission; cooldown; excitation test results; forced-flow cable-in-conduit conductor; fusion reactor; heat generation; hydraulic characteristics; poloidal field coils; pressure drops; radial displacement; single inner vertical coil; superconducting transition; Acoustic measurements; Conductors; Cooling; Fabrics; Glass; Insulation; Superconducting coils; Superconducting filters; Testing;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/77.614537

Filename

614537