Investigation and comparison of AC losses on stabilizer-free and copper stabilizer HTS tapes

Abstract

This paper presents the measurement and simulation of Alternating Current (AC) losses on the Stabilizer-free and Copper Stabilizer High Temperature Superconducting (HTS) Tapes: SuperPower SF12100 and SCS12050. The AC loss measurement utilised electrical method to obtain overall losses with AC transport currents. The 2D H-formulation by COMSOL Multiphysics has been used to simulate the real geometry and multi-layer HTS tapes. Ferromagnetic AC losses of substrate have been assumed to be ignored as the substrates of SF12100 and SCS12050 are non-magnetic. Hysteresis AC losses in the superconducting layer, and eddy-current AC losses in copper stabilizer, silver overlayer and substrate were concerned in this investigation. The measured AC losses were compared to the AC losses from simulation, with 3 cases of different AC frequency 10, 100, and 1000 Hz. The eddy-current AC losses of copper stabilizer at frequency 1000 Hz were determined from both experiment and simulation. The estimation of AC losses with frequency at 10000 Hz was also carried out using simulation method. Finally, the frequency dependence of AC losses from Stabilizer-free Tape and Copper Stabilizer Tape were compared and analysed.

Development of an HTS Magnet for Ultra-Compact MRI System: Optimization Using Genetic Algorithm (GA) Method

“…In the first stage, the strength and uniformity of magnetic field are the first priorities to judge the feasibility of this HTS magnet with a specific HTS tape. Other important factors such as the transient loss [23][24][25][26][27], anisotropic field dependence [28][29][30], quench protection [31][32][33], and force analysis will be incorporated into the future design.…”

Review of the AC loss computation for HTS using H formulation

“…the eddy-current AC loss in the metal layer (normally copper stabilizer and silver over-layer), and ferromagnetic AC loss in the magnetic substrates. Shen et al used H-formulation as the tool to calculate the eddy-current AC loss in the copper stabilizer and the total AC loss in the SuperPower 2G HTS tapes (SF12100 and SCS12050), which were also well verified by the measurement [35]. The AC losses in the HTS tapes with magnetic substrates were calculated using the H-formulation FEM model [36].…”

Investigation on Power Dissipation in the Saturated Iron-Core Superconducting Fault Current Limiter

“…2(b) to demonstrate the details of AC windings, and Fig. 2 (d The power frequency, 50 Hz, was used for the whole modeling, thus it was justifiable to neglect the eddy current AC losses in the copper and other metal layers of HTS tape [31]. Consequently, only the hysteresis (magnetization) losses in the superconducting layer make contribution to the power dissipation.…”