Title :
A characterization of internal-Sn Nb3Sn superconductors for use in the proof of principles (POP) coil [for ITER]
Author :
Summers, L.T. ; Duenas, A.R. ; Karlsen, C.E. ; Ozeryansky, G.M. ; Gregory, E.
Author_Institution :
Lawrence Livermore Nat. Lab., CA, USA
fDate :
3/1/1991 12:00:00 AM
Abstract :
High-performance, Ti-alloyed, internal-Sn superconductors have been selected for use in the Proof of Principles (POP) coil, a 1.0-m o.d., 0.4-m i.d. solenoid designed to produce fields up to 15 T. The POP coil will use forced-flow cable-in-conduit conductors (CICC) and will operate at 4.2 K and moderate levels of conductor strain. A report is presented on the results of detailed characterizations of two proposed POP coil Nb3Sn 19 subelement superconducting wires of differing topology. An investigation has been conducted of the critical current as a function of applied field and applied strain. The wires were found to have excellent high-field properties, providing a high performance margin for the proposed POP coil. The field and strain dependence of Jc have been found to compare favorably with predictions from a wire performance model recently developed for Nb3Sn superconductors
Keywords :
Tokamak devices; composite superconductors; critical current density (superconductivity); critical currents; fusion reactor theory and design; niobium alloys; plasma toroidal confinement; superconducting magnets; tin alloys; type II superconductors; (NbTi)3Sn; 15 T; 4.2 K; A15 superconductor; Cu matrix; Cu-Nb3Sn; ITER magnets; Nb3Sn superconductors; applied field; applied strain; critical current; critical current density; forced-flow cable-in-conduit conductors; high performance margin; high-field properties; internal tin method; proof of principles coil; solenoid; Capacitive sensors; Conductors; Niobium; Solenoids; Superconducting cables; Superconducting coils; Superconducting filaments and wires; Superconductivity; Tin; Topology;
Journal_Title :
Magnetics, IEEE Transactions on
