Title :
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
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;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
DOI :
10.1109/TASC.2013.2297685
