Title :
Ramp-rate limitation test of cable-in-conduit conductors with supercritical helium
Author :
Jeong, S. ; Takayasu, M. ; Minervini, J.V. ; Schultz, J.H.
Author_Institution :
Plasma Fusion Center, MIT, Cambridge, MA, USA
fDate :
6/1/1995 12:00:00 AM
Abstract :
It has been found on the United States Demonstration Poloidal Coil (US-DPC) and in 27 strand subsized cables of pool boiling cable-in-conduit conductor (CICC), that there is critical current degradation due to fast ramping of the magnetic field. The characteristics of this ramp-rate limitation phenomenon are investigated by using a 27 strand Nb/sub 3/Sn cable in supercritical helium at 6 atm. A 3 m long cable-in-conduit conductor is prepared noninductively and tested in a background field up to 9.5 tesla with maximum ramp rate of 1.6 tesla/second. The ramp-rate limitation results are compared with results of the ramp rate test of the US-DPC and previous experiments. The experimental data are analyzed to identify and understand possible sources of ramp-rate limitation.<>
Keywords :
critical current density (superconductivity); niobium alloys; superconducting cables; superconducting coils; superconducting device testing; tin alloys; 27 strand Nb/sub 3/Sn cable; 3 m; 6 atm; 9.5 T; Nb/sub 3/Sn; United States Demonstration Poloidal Coil; cable-in-conduit conductors; ramp-rate limitation test; superconducting cable; supercritical helium; Cables; Coils; Conductors; Critical current; Degradation; Helium; Magnetic fields; Niobium; Testing; Tin;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
