Progress of the JT-60 SA Toroidal Field Coils Tests in the Cold Test Facility

JT-60 SA is a fusion experiment which is jointly constructed by Japan and Europe and which shall contribute to the early realization of fusion energy, by providing support to the operation of ITER, and by addressing key physics issues for ITER and DEMO. In order to achieve these goals, the existing JT-60 U experiment will be upgraded to JT-60 SA by using superconducting coils. The 18 Toroidal Field Coils (TFC) of the JT-60 SA device are provided by European industry and tested in a Cold Test Facility (CTF) at CEA Saclay. At the summer 2017, 14 TFCs will have been tested at the nominal current of 25.7 kA and at a temperature between 5 and 7.5 K. The main objective of these tests is to check the TF coils performances and hence mitigate the fabrication risks. These tests allowed checking a certain number of performances of the TFCs: DC/AC insulation, cooling down characterization, RRR of the conductor, pressure drop in the winding pack, and temperature margin against a quench. This paper will show the testing program progress and give an overview of the main experimental results obtained during these tests. The main performances of each coil will be summarized, analyzed, and discussed in the light of the expected TFCs performances.