Title :
Comparison of two ICCS conductors for MHD application
Author :
Hale, J.R. ; Marston, P.G. ; Dawson, A.M.
Author_Institution :
Plasma Fusion Center, MIT, Cambridge, MA, USA
fDate :
3/1/1989 12:00:00 AM
Abstract :
Two subscale, internally cooled, cabled superconductors (ICCSs) have been examined as candidates for use in a retrofit MHD (magnetohydrodynamic) topping cycle magnet. One of these was a 3×3×3 cable in which all the strands were multifilamentary NbTi stabilized with copper. The other was a 3×3×3 cable in which two strands in each of the nine triplets wa OFHC copper and one was multifilamentary NbTi. The overall copper-to-superconductor ratio for each of the two 27-strand cables was approximately the same. The two conductors were cowound onto a grooved mandrel in such a way that they could be tested alternately. Each sample was instrumented with a heater at the center of the conductor length and with a pressure transducer, four pairs of voltage taps, and one iron-doped gold/constantan thermocouple. Performance tests of the conductors were made at 6-, 7-, and 7.8-T background magnetic fields and at heater input energies ranging from 60 mJ/cm3 to 1758 mJ/cm3 of conductor. The results of these tests and their significance for MHD magnet design and economics are discussed
Keywords :
coils; magnetohydrodynamic power plants; niobium alloys; superconducting magnets; 27-strand cables; ICCS conductors; MHD application; NbTi; background magnetic fields; cabled superconductors; copper-to-superconductor ratio; grooved mandrel; heater input energies; internally cooled; pressure transducer; retrofit MHD; thermocouple; topping cycle magnet; voltage taps; Conductors; Copper; Instruments; Magnetohydrodynamics; Multifilamentary superconductors; Niobium compounds; Superconducting cables; Superconducting magnets; Testing; Titanium compounds;
Journal_Title :
Magnetics, IEEE Transactions on
