Development of a superconducting magnet for nuclear magnetic resonance using bulk high-temperature superconducting materials
Development of a superconducting magnet for nuclear magnetic resonance using bulk high-temperature superconducting materials
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DOI：
10.1002/cmr.b.20083
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发表时间：
2007-04-01
影响因子：
0.9
通讯作者：
Uzawa, Jun
中科院分区：
文献类型：
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作者：
Nakamura, Takashi;Itoh, Yoshitaka;Uzawa, Jun
我们使用块体高温超导（HTS）材料（Sm-Ba-Cu-O；缩写为Sm123）开发了一种俘获场磁体系统，并用它来观察H-1核磁共振（NMR）信号。紧凑的磁铁系统可以安装在桌子上，不需要液氦等传统制冷剂。该磁体具有 c 轴取向的单畴 Sm123 体超导体，含有 20 wt.% Ag，并通过熔融织构工艺合成。该磁铁由两个圆柱形部件构成，外径分别为 36 毫米，内径为 7 毫米，厚度为 16 毫米。这种配置可实现磁场稳定性和适合 NMR 信号观察的均匀性。使用场冷却（FC）方法通过普通NMR超导磁体将磁体磁化至3T。大块磁体在 60K 下磁化，并使用脉冲管制冷机将温度保持在 58K 以下。我们观察到直径为 1.2 mm、长度为 1.5 mm 的硅橡胶在 2.89 Tesla (123 MHz) 和 228 kHz 峰宽下的 1 H NMR 信号。 (c) 2007 年 Wiley 期刊公司。
We developed a trapped-field magnet system using a bulk high-temperature superconducting (HTS) material (Sm-Ba-Cu-O; abbreviated as Sm123) and used it to observe a signal of H-1 nuclear magnetic resonance (NMR). The compact magnet system can fit on a table and needs no conventional refrigerant such as liquid helium. The magnet has a c-axis-oriented single-domain Sm123 bulk superconductor containing 20 wt.% Ag and was synthesized in the melt-textured process. The magnet is constructed of two cylindrical pieces, 36-mm outer and 7-mm inner diameters, respectively, and 16-mm thickness. This configuration results in magnetic field stability and suitable homogeneity for observation of NMR signal. The magnet was magnetized to 3 T by an ordinary NMR superconducting magnet by using a field cooling (FC) method. The bulk magnet was magnetized at 60K and has been kept at the temperature under 58K by using a pulse tube refrigerator. We observed 1H NMR signal from the silicon rubber with the size of 1.2 mm diameter and 1.5 mm length at 2.89 Tesla (123 MHz) and 228 kHz peak width. (c) 2007 Wiley Periodicals, Inc.