Commissioning of the Cold Test Facility for the JT-60SA Tokamak Toroidal Field Coils

JT-60SA 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. The 18 superconducting toroidal field (TF) coils of the JT-60SA device will be provided by the European laboratories ENEA and CEA and tested in a cold test facility (CTF) at CEA Saclay. The coils will be cooled with supercritical helium and tested at the nominal current of 25.7 kA, at temperatures between 5 and 7.5 K, to check the temperature margin against a quench. The main objective of these tests is to validate the TF coil performance and hence mitigate fabrication risks. During the CTF commissioning phase, the cooling down and warming up capacities have been checked, the main thermal and hydraulic performances of the cryogenic loop have been measured, and the electrical circuit including the magnet safety system has been tested in quench conditions. This paper will give an overview of the main results from the commissioning tests of the CTF.