To enhance the acceleration performance of a superconducting linear accelerator (SLA) system used for fuel pellet injection in fusion reactors, a numerical investigation was carried out. For this purpose, a numerical code based on the finite element method (FEM) was developed to analyze the simultaneous behavior of shielding current density and dynamic motion of the high-temperature superconducting thin film. To optimize the current profile in the electromagnets, a method combining the normalized Gaussian network approach with a genetic algorithm was implemented in the code. The computational results demonstrated that the optimized current distribution resulted in a narrower profile compared to the uniform distribution. As a result, it was possible to increase the size of the thin film, leading to a significant reduction in the acceleration time required to reach the desired speed, approximately 2.9 times faster.

In this paper, non-ideal superconductors with crack defects are considered and two-dimensional partial differential control equations are presented based on the H-method. A coupled electric-magnetic-thermal multi-field of non-ideal HTSLS was analyzed employing the PDE module and heat transfer module of the finite element software COMSOL. The temperature distribution and AC losses variation of the non-ideal HTSLS under alternating magnetic fields were investigated. The simulation results indicate that the presence of cracks aggravates the AC losses of the system. The AC losses of the HTSLS increase with the increasing of the crack opening angle of the bulk, and show a linear increasing relationship with the amplitude of the applied magnetic field. The temperature distribution interior to the ideal superconductor propagates from the edges towards the inside, with the highest temperature rise effect occurring at the edges. The temperature distribution of ideal HTSLS displays an axisymmetric bimodal law. However the non-ideal HTSLS with cracks defects shows a unimodal distribution.

Ultra-high magnetic field high-temperature superconducting (HTS) magnets beyond 20 T are under development all over the world. Electromagnetic forces strong enough to deteriorate the specifications of HTS work for such ultra-high field magnets. In recent years, several simulation methods to simultaneously consider the electromagnetic and the mechanical behaviors were proposed. In this paper, we propose a correct inductive voltage formulation and an acceleration method to compute the inductances with a fast multipole method. As the result, we can report a phenomenon that the turn-to-turn contact resistance which is an important factor for no-insulation HTS coils increases, because some gaps appear between coil turns.

In high-field applications, mechanical and electromagnetic properties are crucial components of high-temperature superconducting (HTS) magnets. In this research, to predict the multi-field behaviors of conductors on the round core (CORC) cable during the excitation and cool-down, the coupled mechanical-electromagnetic model is constructed with consideration of the strain and magnetic field dependences of the critical current. 3D modeling is used to enhance the irreversible strain limit of HTS tape, which also allows for reducing magnetization losses. The result shows that smaller winding angles are still the optimal choice regarding resistance to deformation, critical current degradation, and magnetic shielding. The conclusions drawn in this paper will guide the design of future CORC cables.