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Performance Analysis of Superconducting Coil Impregnated with Epoxy Resin.

The second generation high temperature superconducting (HTS) coated conductors (CC) have lower AC losses and higher current density than the first generation wires [1], but its weak mechanical properties limit its application in large storage magnets. Because of high field and high current density, Lorentz force effects mechanical stability of superconducting magnet greatly [2]. To improve the stability of the magnet, a coil winding technology has been developed for bonding wires together by impregnating epoxy resin. After the coil is impregnated with epoxy resin the structure size is changed. Therefore the resin insulation layer also affects the inductance and the actual current-carrying capacity of the superconducting coil [3]. The impregnation curing process conditions will produce thermal stress, due to differences in the thermal expansion coefficients of various engineering materials for HTS magnets [4], [5]. In this work, we modified the distance between the turns of the coil and investigated the distance influence on the inductance of the coil, then analyzed thermal stress induced by impregnation curing process on superconducting coil.