Investigation of HTS Current Leads Under Pulsed Operation for JT-60SA

Author

Drotziger, S. ; Fietz, W.H. ; Heiduk, M. ; Heller, R. ; Lange, C. ; Lietzow, R. ; Mohring, T.

Author_Institution

Karlsruhe Inst. for Technol., Karlsruhe, Germany

Volume

22

Issue

3

fYear

2012

fDate

6/1/2012 12:00:00 AM

Firstpage

4801704

Lastpage

4801704

Abstract

The test of two Wendelstein 7-X (W7-X) prototype high temperature superconductor (HTS) current leads (CL) was extended to dynamic operation, in order to evaluate AC losses in parts of the CL. Trapezoidal and triangular current cycles up to a maximum current of 20 kA with different ramp rates between 0.5 kA/s and 10 kA/s were performed. Temperature changes at the warm end of the HTS-module and the influence on the heat load at the cold end of the CL were studied. Additionally, a DC operation that generates a power loss equivalent to the triangular pulsing run was investigated. AC losses in the low temperature part of the CL are estimated by simplified models and compared to the experimental results of the heat load measurements. The effect of the AC losses on the CL performance is discussed.

Keywords

high-temperature superconductors; AC loss evaluation; DC operation; HTS CL; HTS-module; JT-60SA; W7-X prototype; Wendelstein 7-X prototype; current 20 kA; high temperature superconductor current leads; pulsed operation; trapezoidal current cycles; triangular current cycles; triangular pulsing; Conductors; Copper; Heating; Helium; High temperature superconductors; Loss measurement; Temperature measurement; Current leads; fusion magnets; high temperature superconductors;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/TASC.2011.2178580

Filename

6096378