A numerical study on homogeneity and central field with axial spacing between DP coils of HTS magnet at 65 K

IF 1.8 3区工程技术 Q3 PHYSICS, APPLIED

Cryogenics Pub Date : 2024-04-15 DOI:10.1016/j.cryogenics.2024.103838

S.K. Chand , A. Anand , A.S. Gour , T.S. Datta , U. Bhunia

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Abstract

A numerical study is performed with COMSOL multi-physics, to analyze the effect of axial spacing between double pancake (DP) coils on central magnetic field and field homogeneity of High temperature Superconducting (HTS) magnet. The magnet is wound in the form of DP coils having, inner winding diameter as 100 mm and is operated at 65 K. The field homogeneity is calculated over a Diameter of Spherical Volume (DSV) of 40 mm for the entire study. The analysis is carried out by considering a constant length of HTS tape of 750 m and varying the number of DP coils from 4 to 14. The number of turns in all the DP coil is equal for a given set of DP coils to maintain the length of HTS tape to be constant. The coil separation within DP coils is of constant gap from 0.5 to 2 mm, while the axial spacing between the DP coils is varied from 0 to 50 mm for all the set of DP coils. The optimum gap between DP coils was evaluated using Exhaustive search optimization techniques and decreased with the number of DP coils. The best field homogeneity of 662.5 ppm was achieved with 14 DP coils having $g_{D P} = 20.3$ mm and $g_{S P} = 2$ mm for the chosen solenoid configuration.

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关于 65 K 时 HTS 磁体 DP 线圈轴向间距的均匀性和中心磁场的数值研究

利用 COMSOL 多物理场进行了数值研究，分析双饼线圈（DP）之间的轴向间距对高温超导（HTS）磁体中心磁场和磁场均匀性的影响。磁体以 DP 线圈的形式绕制，绕组内径为 100 毫米，工作温度为 65 K。分析时，HTS 磁带的长度恒定为 750 米，DP 线圈的数量从 4 个到 14 个不等。对于一组给定的 DP 线圈，所有 DP 线圈的匝数相等，以保持 HTS 磁带长度不变。DP 线圈内的线圈间距为 0.5 至 2 毫米，而所有 DP 线圈的轴向间距为 0 至 50 毫米。使用穷举搜索优化技术评估了 DP 线圈之间的最佳间隙，该间隙随着 DP 线圈数量的增加而减小。在所选螺线管配置中，14 个 DP 线圈的 gDP=20.3 毫米，gSP=2 毫米，达到了 662.5 ppm 的最佳磁场均匀度。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Cryogenics 物理-热力学

CiteScore

3.80

自引率

9.50%

发文量

审稿时长

2.1 months

期刊介绍： Cryogenics is the world''s leading journal focusing on all aspects of cryoengineering and cryogenics. Papers published in Cryogenics cover a wide variety of subjects in low temperature engineering and research. Among the areas covered are: - Applications of superconductivity: magnets, electronics, devices - Superconductors and their properties - Properties of materials: metals, alloys, composites, polymers, insulations - New applications of cryogenic technology to processes, devices, machinery - Refrigeration and liquefaction technology - Thermodynamics - Fluid properties and fluid mechanics - Heat transfer - Thermometry and measurement science - Cryogenics in medicine - Cryoelectronics