Title :
Drastic improvement of Ic of Nb3Sn CIC conductor by prestraining at room temperature
Author :
Torossian, A. ; Specking, W. ; Duchateau, JL ; Decool, P.
Author_Institution :
Dept. de Recherche sur la Fusion Controlee, Euratom-CEA, St.-Paul-lez-Durance, France
Abstract :
The strain sensitivity of Nb3Sn cable is well known. However the practical process to compensate for this effect when 316 LN is used for the jacket has never been considered. In this paper different proposals are analysed in order to prevent the 316 LN jacket contracting more than the Nb3Sn cable. A first experiment performed in the FBI test facility of KfK has shown that a prestrain of 0.3% carried out at 275 K on a short straight sample of cable in conduit conductor (3×3×4 Nb3Sn strands of 0.73 mm in a 316 L conduit) produced an improvement of the critical current. The improvement in this condition is about 80%. Different designs of tooling usable for the CS and TF coils of ITER are described
Keywords :
Tokamak devices; critical currents; deformation; fusion reactors; niobium alloys; superconducting cables; superconducting magnets; tin alloys; tools; type II superconductors; 0.73 mm; 275 K; 316 LN jacket; CIC conductor; CS coils; ITER; Nb3Sn; Nb3Sn cable; TF coils; cable in conduit conductor; critical current; prestraining; strain sensitivity; tooling; Cable shielding; Capacitive sensors; Coils; Conductors; Critical current; Niobium; Performance evaluation; Proposals; Test facilities; Tin;
Conference_Titel :
Fusion Engineering, 1993., 15th IEEE/NPSS Symposium on
Conference_Location :
Hyannis, MA
Print_ISBN :
0-7803-1412-3
DOI :
10.1109/FUSION.1993.518530
