Boil-off calorimetric measurement of inductive heating energy in stability test of superconducting magnet

Inductive heating method is applied to stability test of superconducting magnet, because the method can heat the conductor so quickly. The apparatus for measuring the quantity of heat put into the conductor with this inductive heating method was made, and the measuring method approached to completion. The measuring method is that the volume of helium boil-off gas with inductive heating is measured and the quantity of heat put into the cable is calculated with the volume and evaporation heat of helium. Investigation of the reliability of the apparatus was performed by using the resistive heater, and it was found that the apparatus had fair accuracy. The quantity of inductive heat of the strand, conduit and heater respectively were estimated in the measurement of a cable-in-conduit type conductor. This measuring method is demonstrated to be applied to the calibration of the quantity of heat put into conductor in the stability test of superconducting magnet. (author)