Analysis method of AC loss and temperature margin in forced flow cooled superconductors

Ichige, Toshikatsu; Murakami, Haruyuki; Kizu, Kaname; Yoshida, Kiyoshi

The superconducting coil cannot operate after the quench that its conductor temperature becomes above the critical temperature and normal reason expands explosively. It is important to keep enough temperature margin from the operating temperature to the current sharing temperature. The forced flow conductor is adopted for the Tokamak machine because the mechanical strength and electrical high voltage are required. The performance of its conductor is depended on the magnetic field and temperature. This analysis method is validated by the comparison between experimental data and this analysis. This analysis method can evaluate the temperature margin of the superconducting conductor along its cooling length and during all operation scenarios, in case of the inlet temperature and the mass flow rate for the cooling condition. This analysis method can provide analysis results for selection of conductor parameters and for optimizing of the cooling condition from the cryoplant.