Recent Tests of the ITER Conductors and Highlights in Nb3Sn Conductors Behavior

The tests of the ITER Toroidal Field (TF) full length conductors (hundreds of meters, production phase IN) were started at the end of year 2012 and were performed accordingly to the firmly specified test program. The TF conductors produced by the ITER domestic agencies (European Union, Japan, Korea, and Russian Federation) passed the qualification tests to be used for the TF coil winding. The four ITER Central Solenoid (CS) conductors produced in Japan were tested in frame of supplier qualification tests in order to verify the improved design of the CS conductor operating in cyclic mode and, thus, to solve the issue of drastic performance degradation with electromagnetic cyclic loading observed earlier. The test results of the recently tested ITER conductors are summarized in this paper, and the specific features of the voltage-temperature (VT) evolution in Nb3Sn conductors during the qualification test campaigns are highlighted and compared with earlier tested conductors.