Critical current (
IC) and sharing temperature (
TCS) measurement of the ITER-CS insert coil were performed. The coil is Nb
3Sn superconducting coil and is installed inside the ITER-CS model coil. Voltage behavior related to normal state transition of a conductor during
IC or
TCS measurement has not been well understood, especially in such a large cable as this coil, which has more than 1, 000 strands, because the magnetic field, which makes much effect against superconduting property, is not constant inside of a cable. The authors analyzed voltage behavior of the conductor during the measurement and found that an averaging electric field gives reasonable clues to evaluate
IC or
TCS value, considering the twist pitch of the cables which is less than the range of the field variation in this case. The obtained result showed a lower
TCS value than the expected value from the strand by 0.2-0.4K.
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