Liquid-helium-free persistent-mode HTS magnets for NMR and MRI applications

适用于 NMR 和 MRI 应用的无液氦持久模式 HTS 磁体

• 批准号: 9094257
• 负责人: Yukikazu Iwasa
• 金额: $ 18.15万
• 依托单位: MASSACHUSETTS INSTITUTE OF TECHNOLOGY
• 依托单位国家: 美国
• 财政年份: 2015
• 资助国家: 美国
• 起止时间: 2015-07-01 至 2018-04-30
• 项目状态: 已结题
• 来源: https://reporter.nih.gov/project-details/9094257
• 关键词: Achievement; Bathing; Budgets; Clinical Services; Development; Devices; Diagnostic; Eating; Equipment; Evaluation; Exploratory/Developmental Grant; Gases; Goals; Helium; High temperature of physical object; Industry; International; Joints; Korea; Lead; Liquid substance; Magnetic Resonance Imaging; Manufacturer Name; Measures; Mechanics; Methods; Nitrogen; Output; Patients; Performance; Power Sources; Price; Private Sector; Privatization; RNA Splicing; Recording of previous events; Reporting; Research; Research Personnel; Resistance; Scientist; Site; Solid; Structure; Techniques; Technology; Test Result; Time; Universities; cold temperature; cryogenics; design; design and construction; driving force; new technology; next generation; operation; programs; public health relevance; superconductivity; symposium; wound

 DESCRIPTION (provided by applicant): The global helium (He) shortage is now one of the most pressing challenges for superconducting NMR/MRI magnets, both for manufacturers and users. In the last decade, helium price has quadrupled and the rise is expected to accelerate as the US Federal Helium Reserve rapidly depletes. The on-going liquid helium (LHe) crisis makes it urgent, and imperative than ever, to develop LHe-free NMR/MRI magnets, for which HTS has a definite and overwhelming edge over LTS. However, there is a critical technology that has yet been applied to the HTS magnet: persistent-mode operation that requires superconducting HTS-HTS joints in the magnet. In 2013, our collaborators, Korea University and SuperMag Inc., reported a fabrication method and successful test results of an REBCO- REBCO superconducting joint, for the first time in magnet technology history, at the 23rd International Magnet Technology Conference. This REBCO-REBCO joint, measured in a bath of liquid nitrogen (LN2) at 77 K, has a resistance of <10-15 Ω, sufficiently small for persistent-mode NMR and MRI magnets. As the first step toward developing the next-generation, LHe-free, persistent-mode HTS NMR/MRI magnets, this 2-year R21 program applies this outstanding splicing achievement to build and operate the first-ever persistent-mode HTS magnets wound with REBCO tape. Two specific aims of this 2-year program are to: 1) design and build two LHe-free, persistent-mode REBCO magnets of two relevant sizes, an 83-mm/2.35-T for NMR and a 500-mm/0.1-T for MRI; and 2) operate the two magnets, first in LN2 at 77 K and next in solid nitrogen (SN2) in the range 10-30 K. The main focus of the program is to develop "practical" solutions for persistent-mode operation of HTS NMR/MRI magnet that can be operated under a solid cryogen (LHe-free) condition. We strongly believe that both LHe-free and persistent-mode features will make the HTS magnet an indispensable option in the next-generation NMR/MRI magnets. Successful completion of this 2-year R21 program will result in further development of key technologies for manufacturing LHe-free, persistent-mode HTS NMR/MRI magnets that have never been available to date. Undoubtedly, it will push forward the state-of-the-art HTS magnet technology, to the next level. Ultimately, this new technology will lead to affordable NMR magnets for research and economical diagnostic MRI magnets that benefit more people.

 描述（由申请人提供）：全球氦气 (He) 短缺现在是超导 NMR/MRI 磁体面临的最紧迫的挑战之一，无论是对于制造商还是用户来说，在过去十年中，氦气价格已经翻了两番，并且预计还会上涨。随着美国联邦氦储备迅速耗尽，持续的液氦 (LHe) 危机使得开发不含 LHe 的 NMR/MRI 磁体比以往任何时候都更加紧迫和必要。 HTS 相对于 LTS 具有明显的压倒性优势，但是，有一项关键技术尚未应用于 HTS 磁体：需要磁体中的超导 HTS-HTS 接头。2013 年，我们的合作者韩国。大学和 SuperMag Inc. 在第 23 届国际磁体技术会议上报告了 REBCO-REBCO 超导接头的制造方法和成功的测试结果，这在磁体技术历史上是首次。 REBCO-REBCO 接头在 77 K 的液氮 (LN2) 浴中测量，电阻 <10-15 Ω，对于 NMR 和 MRI 永磁体来说足够小，这是开发下一代 LHe 的第一步。 -自由、持久模式 HTS NMR/MRI 磁体，这个为期 2 年的 R21 计划应用这一杰出的拼接成就来构建和操作第一个用 REBCO 缠绕的持久模式 HTS 磁体这个为期 2 年的计划的两个具体目标是：1）设计和制造两个具有两种相关尺寸的无 LHe、持久模式 REBCO 磁体，一个用于 NMR 的 83 毫米/2.35-T 和一个用于 500 毫米/的磁体。 0.1-T 用于 MRI；2) 操作两个磁体，首先在 77 K 的 LN2 中，然后在 10-30 K 范围内的固态氮 (SN2) 中。该计划旨在开发可在固体冷冻剂（无 LHe）条件下运行的 HTS NMR/MRI 磁体的持久模式操作的“实用”解决方案，我们相信无 LHe 和持久模式功能都将使该磁体成为可能。 HTS 磁体是下一代 NMR/MRI 磁体中不可或缺的选择，这一为期 2 年的 R21 计划的成功完成将进一步开发制造无 LHe、持久模式 HTS NMR/MRI 的关键技术。毫无疑问，它将把最先进的 HTS 磁体技术推向新的水平，最终，这项新技术将带来用于研究的经济型 NMR 磁体和经济的诊断 MRI 磁体。从而造福更多人。