Conductor Performance of TFCN4 and TFCN5 Samples for ITER TF Coils

The fourth China TF conductor sample (TFCN4) for Phase II, the left leg of the fifth China TF conductor sample (TFCN5) for Phase III, as well as the right leg of the TFCN5 conductor for Phase IV, were made of the WST strands, cabled by Baosheng, jacketed at ASIPP, and prepared by CRPP following the IO-approved procedure and tested in the SULTAN facility. The Tcs test results show that both legs of the TFCN4 and TFCN5 have high Tcs performance. Using the electrical method, the Tcs was 6.56 K for the left leg of TFCN4 and 6.58 K for the right leg of TFCN4 at 68 kA/10.78 T in the first test and 6.36 K for both legs after 1000 electromagnetic load cycles. In the case of TFCN5, Tcs was 6.56 K for the left leg and 6.30 K for the right leg at 68 kA/10.78 T in the first test and 6.33 K for the left leg and 6.02 K for the right leg after 1000 electromagnetic load cycles. According to the SULTAN test result, Tcs values of TFCN4 and TFCN5 conductor samples meet the ITER acceptance criteria.