Numerical Study of the Screening Current Induced Magnetic Field Intensity in the HTS Insert of a 16-T Superconducting Dipole Magnet
Numerical Study of the Screening Current Induced Magnetic Field Intensity in the HTS Insert of a 16-T Superconducting Dipole Magnet
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DOI：
10.1109/tasc.2023.3329888
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发表时间：
2024-01
影响因子：
1.8
通讯作者：
Ze Feng;Lei Wang;R. Kang;Juan Wang;Chunyan Li;Chengtao Wang;Qingjin Xu
中科院分区：
文献类型：
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作者：
Ze Feng;Lei Wang;R. Kang;Juan Wang;Chunyan Li;Chengtao Wang;Qingjin Xu
为了获得15 - 20t甚至更高的偶极子场，目前采用高温超导（HTS）内嵌线圈和低温超导（LTS）外嵌线圈制造磁体是可行的方法。中国科学院高能物理研究所的超导磁体小组正在设计一个3-T高温超导线圈，该线圈将插入到4.2K的13-T Nb3Sn偶极磁体中。HTS插件由4个双煎饼线圈组成，用2毫米厚、9毫米宽的HTS电缆缠绕。该电缆采用平面内弯曲堆叠HTS胶带直接实现换位。由于载流基元尺寸较大，稀土钡铜氧化物（ReBCO）等涂层导体在运行过程中被强磁化，导致超导加速器磁体磁场质量明显下降。采用TA公式对电缆内部的屏蔽电流进行模拟，建立了线圈的数值模型，量化了屏蔽电流感应场效应对场质量的贡献。此外，还分析了在交流和直流条件下用于插入线圈的高温超导电缆的损耗。
To obtain a dipole field of 15–20 T or even higher, magnet fabricated with high-temperature superconducting (HTS) insert coils and low-temperature superconductor (LTS) coils outside is a feasible way presently. The superconducting magnet group at the Institute of High Energy Physics, Chinese Academy of Sciences is designing a 3-T HTS coil to be inserted into a 13-T Nb3Sn dipole magnet at 4.2K. The HTS insert is composed of four double-pancake coils, which are wound with the 2-mm thick and 9-mm wide HTS cables. The cable is implemented by in-plane bending stacked HTS tapes directly to realize the transposition. Due to the large dimension of the basic current-carrying element, coated conductors, such as rare-earth barium copper oxide (ReBCO), are strongly magnetized during operation, which leads to a significant degradation of the magnetic field quality of superconducting accelerator magnets. TA formulation is employed to simulate the screening current within the cable, and the numerical model of the coils has been built to quantify the contribution of the screening current–induced field effect on the field quality. In addition, the loss of the HTS cable used for the insert coils at the ac and dc conditions are analyzed.