Title :
Critical current degradation in Nb/sub 3/Sn cables under transverse pressure
Author :
ten Kate, H.H.J. ; Weijers, H.W. ; van Oort, J.M.
Author_Institution :
Appl. Superconductivity Center, Twente Univ., Enschede, Netherlands
fDate :
3/1/1993 12:00:00 AM
Abstract :
The critical current degradation of a few sample Rutherford-type Nb/sub 3/Sn cables is investigated as a function of transverse pressure. A comparison is made between Nb/sub 3/Sn strands produced by the powder-in-tube, bronze, and modified jelly roll processes. The (keystoned) Rutherford cables are charged at 11 T under transverse pressures up to 250 MPa. Large differences in critical current reduction are observed, ranging from 6 to about 60% at 200 MPa, depending on the type of Nb/sub 3/Sn. It appears that about 40% of the total reduction is irreversible. Moreover, the irreversible part shows relaxation, and a partial recovery is possible by thermal cycling.<>
Keywords :
critical current density (superconductivity); niobium alloys; tin alloys; type II superconductors; 250 MPa; Nb/sub 3/Sn cables; Rutherford cables; critical current reduction; partial recovery; relaxation; thermal cycling; transverse pressure; Critical current; Current supplies; Degradation; Magnetic materials; Niobium; Niobium-tin; Stress; Superconducting cables; Superconducting magnets; Tin;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
