Numerical and Experimental Study to Fabricate the New Type Compact NMR Device Using Stacked HTS Bulks.
Numerical and Experimental Study to Fabricate the New Type Compact NMR Device Using Stacked HTS Bulks.
复制标题
使用堆叠高温超导块体制造新型紧凑型核磁共振装置的数值和实验研究。
DOI：
10.1109/tasc.2011.2182170
复制
发表时间：
2012
期刊：
影响因子：
--
通讯作者：
Iwasa,Y
中科院分区：
文献类型：
--
作者：
Kim,SB;Kimoto,T;Yano,Y;Hahn,S;Iwasa,Y
在由高温超导体环堆叠而成的紧凑型NMR（核磁共振）磁体的制造中，通常存在三个关键问题：空间均匀性、时间稳定性和俘获磁场的强度。本文研究了堆叠HTS块体之间的轴向间隙长度对紧凑型HTS NMR应用的块体HTS磁体的三个关键问题的影响。ID和OD分别为20和60 mm的HTS块体磁体具有50和80 mm的高度，这取决于HTS块体之间的轴向间隙长度。每个HTS块体之间的差距长度从0 mm变化到10 mm，并且用作参数以在分析上以及实验上优化HTS块体磁体的整体场均匀性。通过分析得到了最佳的轴向间隙长度，在较低的磁化强度下，可获得较好的磁场均匀性和俘获磁场的时间稳定性。将介绍一种新型紧凑型核磁共振磁体所产生的磁场的空间均匀性和强度的改善。
In fabrication of a compact NMR (Nuclear Magnetic Resonance) magnet which consists of a stacked HTS (High Temperature Superconducting) bulk annuli, generally there are three key issues: spatial homogeneity, temporal stability, strength of trapped magnetic fields. This paper presents a study on the effects of axial gap length between stacked HTS bulks on the three key issues of a bulk HTS magnet for compact HTS NMR applications. The HTS bulk magnet of which the ID and OD are 20 and 60 mm respectively has a 50 and 80 mm heights depending on the axial gap lengths between HTS bulks. The gap length between each HTS bulk varied from 0 mm to 10 mm and were used as parameters to optimize, analytically as well as experimentally, the overall field homogeneity of the HTS bulk magnet. The optimized axial gap length was obtained by analytical results, and the better magnetic field homogeneity and temporal stability of trapped magnetic field were achieved by lower magnetization field. The improved spatial homogeneity and strength of generated magnetic field by a new compact NMR magnet will be presented.