Screening Current-Induced Field and Field Drift Study in HTS coils using T-A homogenous model

TL;DR

This paper presents a T-A homogenous modeling approach for HTS coils that significantly reduces computation time and memory requirements, enabling real-time simulation of screening current effects and field drift in large-scale systems.

Contribution

The study introduces a T-A homogenized model that improves simulation efficiency for large-scale HTS systems, facilitating real-time analysis of screening current phenomena.

Findings

Reduced computation time and memory usage for large-scale HTS simulations

Enabled real-time simulation of slow ramping cycles

Systematic investigation of screening current effects

Abstract

The emergence of second generation (2G) high-temperature superconductor (HTS) tapes has favored the development of HTS magnets for their applications in areas such as NMR, MRI and high field magnets. The screening current-induced field and the field drift are two major problems hindering the use of HTS tapes in the mentioned areas. Both problems are caused by the screening current, then it is necessary to have a modeling strategy capable to estimate such phenomena. Thus far, the H formulation has been the most successful and used approach to model medium-size systems (hundreds of tapes). However, its application to large-scale systems is still impaired by excessive computation times and memory requirements. Homogenization and multi-scaling strategies have been successfully implemented to increase the computational efficiency. In this contribution, we show that using the homogenization technique with the recently developed T-A formulation allows reducing the computation time and the amount of memory up to the point that real-time simulations of slow ramping cycles of large-scale systems are possible. The T-A homogeneous model also allows systematically investigating the screening current using numerical simulations.