Field Performance of an Optimized Stack of YBCO Square "Annuli" for a Compact NMR Magnet.
Field Performance of an Optimized Stack of YBCO Square "Annuli" for a Compact NMR Magnet.
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DOI：
10.1109/tasc.2010.2103920
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发表时间：
2011-06
期刊：
影响因子：
--
通讯作者：
Iwasa Y
中科院分区：
文献类型：
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作者：
Hahn S;Voccio J;Bermond S;Park DK;Bascuñán J;Kim SB;Masaru T;Iwasa Y
研究了由中心带孔的YBCO方板（方环）叠层产生的俘获场的空间场均匀性和时间稳定性。通过优化磁化方形环的堆叠，我们的目标是构建一个紧凑的NMR磁体。堆叠磁体由750个YBCO薄板组成，每个薄板40 mm见方，80 μm厚，孔径25 mm，并具有10 mm的室温NMR测量通道。为了改善750板堆叠（YP 750）的空间场均匀性，进行了三步优化：1）从供应板中统计选择最佳板; 2）多板模块的场均匀性测量;以及3）模块的最佳组装以最大化场均匀性。在本文中，我们提出的分析和实验结果的场均匀性和时间稳定性在77 K，在YP 750和混合堆，YPB 750，其中两个YBCO散装环，每个46毫米和16毫米厚的25毫米孔，被添加到YP 750，一个在顶部和另一个在底部。
The spatial field homogeneity and time stability of a trapped field generated by a stack of YBCO square plates with a center hole (square “annuli”) was investigated. By optimizing stacking of magnetized square annuli, we aim to construct a compact NMR magnet. The stacked magnet consists of 750 thin YBCO plates, each 40-mm square and 80- μm thick with a 25-mm bore, and has a Ø10 mm room-temperature access for NMR measurement. To improve spatial field homogeneity of the 750-plate stack (YP750) a three-step optimization was performed: 1) statistical selection of best plates from supply plates; 2) field homogeneity measurement of multi-plate modules; and 3) optimal assembly of the modules to maximize field homogeneity. In this paper, we present analytical and experimental results of field homogeneity and temporal stability at 77 K, performed on YP750 and those of a hybrid stack, YPB750, in which two YBCO bulk annuli, each Ø46 mm and 16-mm thick with a 25-mm bore, are added to YP750, one at the top and the other at the bottom.