The persistent current switch (PCS) consisting of a superconductive wire made of Nb_3Sn whose critical temperature is higher than NbTi has high stbility. Through the PCS is required to have short switching time, that of Nb_3Sn PCS becomes long because the critical temperature is high. We examined the composition of PCS which has short switching time in a heat transfer analysis by the finite element method (FEM). As the result, it has been found that the switching time can be shortended by optimizing the position of the high termal conductive material and the heater.
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