The High-temperature Superconducting (HTS) magnet is one of the most promising technologies to accommodate various high field applications. With the high magnetic field, the quench problem of HTS material should be considered with extra care, and the specific quench protection scheme should be projected. In this article, the modeling of the quench protection of an HTS magnet for the MRI system is presented. The modeling strategy was composed of two stages: Stage 1 the HTS magnet was in the normal operation circuit, and Stage 2 the HTS magnet was switched to the heat dissipation circuit. The 1st stage was based on the finite element method (FEM) using the H -formulation together with the thermal-coupled model, which simulated the current distribution of typical HTS tapes and showed the process of temperature increase when the hot source occurred. The 2nd stage was based on the analytical model to investigate the reasonable damping resistance and the hot spot temperature of the HTS magnet.

中文翻译：

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MRI 系统高温超导磁体的淬火保护建模

高温超导 (HTS) 磁体是适应各种高场应用的最有前途的技术之一。在强磁场下，应特别注意高温超导材料的失超问题，并制定具体的失超保护方案。在本文中，介绍了用于 MRI 系统的 HTS 磁体失超保护的建模。建模策略由两个阶段组成：第 1 阶段 HTS 磁铁处于正常运行电路，第 2 阶段 HTS 磁铁切换到散热电路。第一阶段基于有限元方法 (FEM)，使用H-公式与热耦合模型一起，模拟了典型HTS胶带的电流分布，并显示了热源出现时温度升高的过程。第二阶段是基于解析模型研究HTS磁体的合理阻尼电阻和热点温度。