Investigation of Strand Bending in the He-Inlet During Reaction Heat Treatment for ITER TF Coils

Author

Hemmi, T. ; Matsui, K. ; Kajitani, H. ; Okuno, Kiyoshi ; Koizumi, N. ; Ishimi, A. ; Katsuyama, K.

Author_Institution

Fusion R&D Directorate, Japan Atomic Energy Agency, Naka, Japan

Volume

24

Issue

3

fYear

2014

fDate

Jun-14

Firstpage

1

Lastpage

4

Abstract

To evaluate presences of performance degradation due to strand bending in Nb3Sn cables, methods for investigating strand bending in Nb3Sn cables were developed by JAEA and demonstrated for the He-inlets of the ITER toroidal field coils. Conductor elongation and residual strain during the reaction heat treatment were measured. In addition, high-resolution X-ray computerized tomography was used to visually search for strand bending in the Nb3Sn cable. As a result, no large strand bending was observed.

Keywords

Tokamak devices; bending; computerised tomography; elongation; heat treatment; internal stresses; niobium compounds; plasma toroidal confinement; superconducting cables; superconducting coils; He-inlet; ITER TF coils; Nb₃Sn; conductor elongation; high resolution X-ray computerized tomography; niobium tin cables; performance degradation; reaction heat treatment; residual strain; strand bending; Cable shielding; Coils; Conductors; Heating; Niobium-tin; Strain; Strain measurement; $ hbox{Nb}_{3}hbox{Sn}$; He-inlet; ITER; strand bending;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/TASC.2013.2297685

Filename

6704717