Evaluation of Magnetic Field Distribution by Screening Current in Multiple REBCO Coils
Evaluation of Magnetic Field Distribution by Screening Current in Multiple REBCO Coils
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DOI：
10.1109/tasc.2016.2542980
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发表时间：
2016-06
影响因子：
1.8
通讯作者：
H. Ueda;A. Ishiyama;Yuta Ariya;Tao Wang;Xudong Wang;K. Agatsuma;H. Miyazaki;T. Tosaka;S. No
中科院分区：
文献类型：
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作者：
H. Ueda;A. Ishiyama;Yuta Ariya;Tao Wang;Xudong Wang;K. Agatsuma;H. Miyazaki;T. Tosaka;S. No
线圈系统由多个线圈的各种组合制成，以便为NMR和MRI应用产生均匀的场。在使用REBCO线圈的多线圈系统中，使场均匀性恶化的屏蔽电流的行为取决于传输电流的模式、线圈的充电顺序以及各种所得磁场。因此，重要的是调查和澄清的行为的不规则磁场和屏蔽电流在多线圈系统在不同的操作环境下。在以前的研究中，我们通过实验和数值计算阐明了基于多模型REBCO线圈中线圈充电顺序的不规则磁场的不同行为[1]，[2]。在本文中，我们构建了多模型REBCO线圈，以获得减少或改善由此产生的不规则磁场的基础数据。此外，通过使用反向电流法[3]，[4]测量了不规则磁场在屏蔽电流方面的分布。我们还计算了空间和时间行为的不规则磁场，通过使用我们开发的3-D数值模拟。基于实验和数值计算结果，我们讨论了在多模型REBCO线圈中使用电流扫描反转法时，磁场随屏蔽电流的变化规律。
Coil systems are fabricated with various combinations of multiple coils in order to generate homogenous fields for NMR and MRI applications. In multiple coil systems using REBCO coils, the behavior of the screening current, which deteriorates field homogeneity, depends on the patterns of the transport current, the charging sequence of the coils, and the various resulting magnetic fields. It is therefore important to investigate and clarify the behavior of the irregular magnetic field and screening current in multiple coil systems under different operating environments. In a previous study, we experimentally and numerically clarified the different behaviors of irregular magnetic fields based on the charging sequence of coils in multiple-model REBCO coils [1], [2]. In this paper, we constructed the multiple-model REBCO coils in order to obtain the fundamental data for reducing or improving the resulting irregular magnetic field. Furthermore, the distribution of the irregular magnetic field in terms of the screening current was measured by using the reversal current method [3], [4]. We also calculated the spatial and temporal behavior of the irregular magnetic field by using our developed 3-D numerical simulation. Based on the experimental and numerical results, we discuss the behavior of the magnetic field in terms of the screening current when using the current sweep reversal method in multiple-model REBCO coils.