Simulation of Stacks of High Temperature Superconducting Coated Conductors Magnetized by Pulsed Field Magnetization Using Controlled Magnetic Density Distribution Coils

TL;DR

This paper develops a 2D electromagnetic-thermal model to simulate high temperature superconducting stacks magnetized by pulsed fields, proposing a coil configuration to enhance trapped fields despite heat generation limitations.

Contribution

It introduces a coupled electromagnetic-thermal model considering realistic material properties and proposes a controlled coil configuration to improve trapped fields in HTS stacks.

Findings

The model accurately simulates the magnetization process of HTS stacks.

Controlled magnetic density distribution coils outperform ordinary solenoids in trapping fields.

Heat generation limits the maximum trapped field achievable with PFM.

Abstract

High temperature superconducting (HTS) stacks of coated conductors (CCs) can work as strong trapped field magnets (TFMs) and show potential in electrical applications. Pulsed field magnetization (PFM) is a practical method to magnetize such TFMs, but due to heat generation during the dynamic process, it cannot achieve a trapped field as high as field cooling can. In this work, we construct a 2D electromagnetic-thermal coupled model to simulate stacks of HTS CCs with realistic laminated structures magnetized by PFM. The model considers temperature and anisotropic magnetic field dependent Jc of HTS and other temperature dependent thermal and electrical material properties. Based on the model, a configuration of controlled magnetic density distribution coils is suggested to improve the trapped field compared to that obtained by ordinary solenoids.