Large Bulk (RE)BCO superconducting magnets for desktop NMR/MRI

用于桌面 NMR/MRI 的大块 (RE)BCO 超导磁体

• 批准号: EP/T014679/1
• 负责人: David Cardwell
• 金额: $ 99.92万
• 依托单位: University of Cambridge
• 依托单位国家: 英国
• 项目类别: Research Grant
• 财政年份: 2020
• 资助国家: 英国
• 起止时间: 2020 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=EP%2FT014679%2F1
• 关键词: Large; Bulk; RE; BCO; superconducting

NMR and MRI are techniques that use the interactions of atoms with external magnetic fields to look inside materials, objects and organisms to study their composition (NMR) and provide images (MRI). They are used very widely in scientific research, medical research and in industry and medicine. Put simply, the stronger the magnetic field available the better these techniques work. Unfortunately, obtaining large magnetic fields (typically 20 -30 times strong than a fridge magnet) generally requires expensive magnets, which are usually wound from long lengths of superconducting wire. It would be ideal to be able to produce these very large magnetic fields in a much simpler fashion to provide convenient and cheap desktop systems. Making these systems widely available and cheaper would allow more scientists, engineers and medical researchers to have access to this equipment, and to use it more often. The importance of this proposed project is underlined by the active participation and practical help offered by our three industrial partners.We are proposing to use ceramic bulk (in disc- or ring-form) superconductors, rather than complex solenoidal coils made from superconducting wire. The three main challenges that must be overcome to do achieve this are (i) making bulk superconductors of sufficient size and uniformity, (ii) making the magnetic field they produce highly uniform, and (iii) developing a practical way of charging bulks samples with magnetic field. To address the first two challenges the Cambridge group, with extensive experience of the fabrication and manufacture of these bulk superconductors, is going to partner with the Oxford group, who have experience of using advanced microscopy to look carefully at the fine details of the manufacturing process. To magnetise the bulk superconductors, we propose to discharge, over a period of several milliseconds, the energy stored in a bank of capacitors into a conventional coil magnet made of copper. Such a copper coil would overheat and melt if were to generate a large magnetic field continuously. However, using this pulsed field magnetisation technique, we can achieve the required field over a short period of time, but long enough to allow the bulk superconductor to "capture" the magnetic field.We will consider the project successful if we can replace the conventional, permanent magnet of an existing NMR system, provided by our industrial partner, with our prototype bulk superconductor based system and demonstrate that it operates effectively at the proton resonance frequency of 200 MHz, rather than at 90 MHz, which is typical of existing permanent magnet systems and a limiting feature of this technology.

NMR和MRI是使用原子与外部磁场的相互作用的技术，将材料，物体和生物体内部看作以研究其组成（NMR）并提供图像（MRI）。它们在科学研究，医学研究以及行业和医学中非常广泛使用。简而言之，可用的磁场越强，这些技术的工作越好。不幸的是，获得大型磁场（通常比冰箱磁铁强的20-30倍）通常需要昂贵的磁铁，这些磁铁通常是从长长的超导线中缠绕的。能够以更简单的方式生产这些非常大的磁场来提供方便且廉价的台式系统是理想的选择。使这些系统广泛可用且便宜，将使更多的科学家，工程师和医学研究人员可以使用该设备，并更频繁地使用它。我们三个工业伙伴提供的积极参与和实践帮助强调了这一拟议项目的重要性。我们建议使用陶瓷散装（以圆盘或环形形式）超导体，而不是由超导线制成的复杂的螺线管线圈。实现这一目标必须克服的三个主要挑战是（i）制造具有足够大小和均匀性的散装超导体，（ii）使它们产生的磁场高度均匀，以及（iii）开发一种为磁场充电样品充电样品的实用方法。为了应对剑桥集团的前两个挑战，并具有丰富的制造和制造这些批量超导体的经验，他们将与牛津集团合作，牛津集团有使用高级显微镜仔细研究制造过程的细节。为了磁化散装超导体，我们建议在几毫秒内排放，将存储在电容库中的能量存储在由铜制成的常规线圈磁铁中。如果要连续产生大型磁场，这种铜线圈会过热并熔化。但是，使用这种脉冲磁化磁化技术，我们可以在短时间内实现所需的字段，但足够长的时间可以允许批量超导体“捕获”磁场。如果我们可以替换我们的工业伙伴，并在我们的工业中提供的频率为usemon strouns intimaties acturomon actimaties acturomentions，我们将考虑该项目成功，如果我们可以替换常规的现有NMR系统的永久磁铁，并将其替换为效率。 MHz，而不是90 MHz，这是现有的永久磁铁系统的典型代表，也是该技术的限制功能。

项目成果

Statistical evaluation of the mechanical properties of partially oxygenated YBCO, oxygenated YBCO and oxygenated YBCO(Ag) single grains

• DOI: 10.1016/j.ceramint.2023.07.128
• 发表时间: 2023-07
• 期刊: Ceramics International
• 影响因子: 5.2
• 作者: Josef Baumann;Yunhua Shi;J. Congreve;J. Durrell;D. Cardwell

Statistical evaluation of the mechanical and flux trapping properties of standard and thin-wall EuBCO(Ag) bulk superconductors

标准和薄壁 EuBCO(Ag) 块体超导体的机械和通量捕获性能的统计评估

• DOI: 10.1111/jace.19601
• 发表时间: 2023
• 期刊: Journal of the American Ceramic Society
• 影响因子: 3.9
• 作者: Baumann J

Dynamics of magnetic flux propagation in bulk, single grain superconducting rings during pulsed field magnetisation

脉冲场磁化过程中块状单晶超导环中磁通量传播的动力学

• DOI: 10.17863/cam.89290
• 发表时间: 2022
• 作者: Beck M

Understanding the porosity and its effects on the superconducting properties of YBCO single grains

• DOI: 10.1016/j.jeurceramsoc.2022.11.039
• 发表时间: 2022-11
• 期刊: Journal of the European Ceramic Society
• 影响因子: 5.7
• 作者: Josef Baumann;Yunhua Shi;Dian Weerakonda;J. Durrell;D. Cardwell