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Japan and EU are promoting the project that the coils in JT-60 installed in Japan Atomic Energy Agency are changed to superconducting coils. We numerically and experimentally evaluate thermal stability of a conductor joint in the planning superconducting coil (EF coil). We measured an AC loss of the prototype joint, and estimated the coupling time constant. The AC loss at the EF coils joint segment was calculated based on the coupling time constant and the magnetic field distribution. Moreover, the temperature rise due to the AC loss was numerically derived. The calculation result showed that the temperature rise was small and the coil was enough stable.