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首页> 外文期刊>Physica, C. Superconductivity and its applications >Characteristics of the magnetic field distribution on compact NMR magnets using cryocooled HTS bulks
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Characteristics of the magnetic field distribution on compact NMR magnets using cryocooled HTS bulks

机译：使用低温冷却的HTS块的紧凑NMR磁体上的磁场分布特征

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摘要

Recently, the performance of high temperature superconducting (HTS) bulks such as critical current density, size, and mechanical strength has been improved rapidly. So. various applications using HTS bulks such as motors, bearings and flywheels have been investigated by many research groups. A compact nuclear magnetic resonance (NMR) magnet is one of the new applications after a technique to enhance maximum trapped field of the HTS bulk more than 11.7 T (500 MHz H-1 NMR frequency) has been developed. This new compact NMR magnet out of HTS bulks is cost-effective compared with conventional NMR magnets and then expected to be widely used in food and drug industry. In design and manufacture of the compact NMR magnets, spatial field homogeneity of the large trapped magnetic field in HTS bulk annuli is a crucial issue because the behavior of a trapped field is highly non-linear and, as a result, a technique to improve the field homogeneity such as active/passive shimming now becomes more challenging compared with that of the conventional counterparts. This paper presents the magnetic field distributions in single and three assembled HTS bulk annuli measured by a 3-axis and multi-arrayed Hall sensor under two different cryogenic environments: (I) in a bath of liquid nitrogen (LN2) and (2) dry cooling by a cryocooler. The spatial homogeneity changes with various operating temperatures were investigated and the effect of critical current density enhancement by lowering the operating temperature on the field homogeneity improvement was discussed in detail.
机译：近来，诸如临界电流密度，尺寸和机械强度之类的高温超导（HTS）块的性能已得到快速改善。所以。许多研究小组已经研究了使用高温超导散装材料的各种应用，例如电机，轴承和飞轮。在开发出一种将HTS主体的最大俘获场增强到超过11.7 T（500 MHz H-1 NMR频率）的技术之后，紧凑型核磁共振（NMR）磁体是新的应用之一。与传统的NMR磁体相比，这种从HTS体积中取出的新型紧凑型NMR磁体具有成本效益，因此有望广泛用于食品和药品行业。在紧凑型NMR磁体的设计和制造中，HTS体空间中大俘获磁场的空间场均匀性是一个关键问题，因为俘获场的行为是高度非线性的，因此，一种改善电磁场的技术与传统的同类产品相比，主动/被动匀场等场均匀性现在变得更具挑战性。本文介绍了在三个不同的低温环境下，通过三轴和多阵列霍尔传感器在三轴和多阵列霍尔传感器中测量的单组装和三组装HTS本体环中的磁场分布：（I）在液氮（LN2）浴中和（2）干燥用冷冻机冷却。研究了不同工作温度下空间均匀性的变化，并详细讨论了通过降低工作温度来提高临界电流密度对磁场均匀性改善的影响。

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