Abstract
High temperature superconductors (HTS) have been developed over the years and have the better performance. Some conceptual HTS composite conductors have been designed for high field magnets, such as fusion magnets. The magnetic field environment in which the magnet is located must be determined to ensure the safety of the HTS magnet. In this paper, we study the magnetic field distribution of the China Fusion Engineering Test Reactor (CFETR) magnetic system under two plasma equilibrium shapes. In the CFETR magnetic system, HTS composite conductors containing stacked HTS tapes are considered to manufacture the toroidal field (TF) coils. The critical current is related to the direction of the magnetic field in HTS tapes, so we focus on the anisotropy of magnetic field of the TF coils. Sometimes, TF coils of the CFETR magnetic system may operate under fault conditions. Two possible fault conditions are considered: the short circuit in one TF coil and the unprotected quench in one TF coil. We evaluate the magnetic performance of the CFETR magnetic system under fault conditions and also analyze the magnetic field of the TF coils in different directions under fault conditions by the finite element method. This provides a reference for the design of the HTS TF magnets.
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