Stability test results on the aluminum stabilized superconductor for the helical coils of LHD

Author

Yanagi, N. ; Satow, T. ; Mito, T. ; Imagawa, S. ; Takahata, K. ; Iwamoto, A. ; Chikaraishi, H. ; Yamaguchi, S. ; Satoh, S. ; Motojima, O. ; Noguchi, S. ; Ishiyama, A.

Author_Institution

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

Volume

9

Issue

2

fYear

1999

fDate

6/1/1999 12:00:00 AM

Firstpage

1113

Lastpage

1116

Abstract

Stability tests have been carried out on short samples of the aluminum/copper stabilized composite-type superconductors developed and used for the pool-cooled helical coils of the Large Helical Device. The waveform of the longitudinal voltage initiated by resistive heaters shows a short-time rise before reaching a final value, which seems to correspond to the diffusion process of transport current into the pure aluminum stabilizer. The propagation velocity has a finite value even for the transport current being lower than the recovery current, and it differs depending on the direction with respect to the transport current.

Keywords

aluminium; composite superconductors; niobium alloys; stability; stellarators; superconducting cables; superconducting coils; titanium alloys; LHD; Large Helical Device; NbTi-Cu-CuAl; aluminum stabilized superconductor; aluminum/copper stabilized composite-type superconductors; diffusion process; helical coils; longitudinal voltage waveform; pool-cooled helical coils; propagation velocity; resistive heaters; short-time rise; stability test; transport current; Aluminum; Conductors; Copper; Cryogenics; Stability; Superconducting coils; Superconducting magnetic energy storage; Superconducting magnets; Testing;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/77.783493

Filename

783493