用于紧凑型核磁共振磁体的优化YBCO方形“环”堆叠的现场性能
Field Performance of an Optimized Stack of YBCO Square "Annuli" for a Compact NMR Magnet.
作者信息
Hahn Seungyong, Voccio John, Bermond Stéphane, Park Dong-Keun, Bascuñán Juan, Kim Seok-Beom, Masaru Tomita, Iwasa Yukikazu
机构信息
Francis Bitter Magnet Laboratory (FBML), Massachusetts Institute of Technology (MIT), Cambridge, MA 02139 USA.
出版信息
IEEE Trans Appl Supercond. 2011 Jun;21(3):1632-1635. doi: 10.1109/TASC.2010.2103920.
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.
研究了由带有中心孔的YBCO方形板（方形“环”）堆叠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，我们旨在构建一个紧凑的核磁共振磁体。堆叠磁体由750块薄YBCO板组成，每块板为40毫米见方、80微米厚，带有25毫米的孔，并且有一个用于核磁共振测量的直径10毫米的室温通道。为了提高750块板堆叠体（YP750）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；3）模块的优化组装以最大化场均匀性。在本文中，我们展示了在77 K下对YP750以及混合堆叠体YPB750进行的场均匀性和时间稳定性的分析和实验结果，在YPB750中，在YP750的顶部和底部各添加了两个YBCO块状环，每个环直径为46毫米、厚16毫米，带有25毫米的孔。
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