A 7-T/54-mm compact no-insulation HTS magnet for NMR applications

描述（由申请人提供）：我们在这里提出了一种创新的方法，用于设计和建造高场高温超导核磁共振磁体，无绝缘（NI）高温超导绕组，裸露或减少稳定剂2G导体，完全消除了匝间绝缘。在这个为期两年的计划中，我们将专注于两个具体目标：1)设计，构建和测试一个标准的54毫米温孔7-T (300 MHz) HTS NI磁铁，以证明所提出的NI技术用于实际核磁共振大小磁铁的可行性；2)用300 mhz 2G NI磁体和300 mhz LTS背景核磁共振磁体产生14 T的组合磁场，目前MIT Francis Bitter磁体实验室提供。这种组合14t磁体的成功将验证NI磁体在高场（ghz级）LTS/HTS NMR应用中的技术可行性。由于紧凑的NI绕组基本上消除了软匝间绝缘子，并最大限度地减少了2G高温超导绕组的稳定器厚度，因此它将增强机械完整性，并使具有自我保护功能的高温超导磁体更可靠地运行。此外，NI磁体在其绕组中消除了尺寸上最不精确的组件，从而减少了制造误差，其空间场均匀性本质上要比绝缘磁体好得多。同样重要的是，由于高温超导本身的厚度与典型的绝缘厚度相当，因此NI高温超导磁体的整体尺寸可以显着减小，从而降低了高场LTS/高温超导核磁共振磁体系统的尺寸和成本。考虑到核磁共振磁体的价格是大多数实验室资本投资的决定性因素之一，我们认为，NI HTS磁体技术衍生的更便宜的核磁共振磁体将对高场核磁共振磁体行业产生巨大影响。该计划的成功将展示对LTS/HTS核磁共振磁体基础的机械，稳定性和保护问题的优雅和实用的解决方案。更普遍的是，NI技术将使大多数依赖于DC高温超导磁体的应用受益，这些磁体结构紧凑，机械坚固，稳定（可靠），受保护，价格具有竞争力。

DESCRIPTION (provided by applicant): We present here an innovative approach, for design and construction of high-field HTS NMR magnets, No Insulation (NI) HTS winding with bare or reduced-stabilizer 2G conductor that completely eliminates turn-to-turn insulation. In this two-year program we will focus on two specific aims: 1) to design, construct, and test a standard 54-mm warm bore 7-T (300 MHz) HTS NI magnet in order to demonstrate feasibility of the proposed NI technique for actual NMR-size magnets; and 2) to generate a combined field of 14 T with the 300-MHz 2G NI magnet and a 300-MHz LTS background NMR magnet currently available at MIT Francis Bitter Magnet Laboratory. Success of this combined 14-T magnet will validate the technical viability of NI magnets for high-field (GHz-class) LTS/HTS NMR applications. Since the compact NI winding essentially removes soft turn-to-turn insulators and minimizes stabilizer thickness of the 2G HTS winding, it will enhance mechanical integrity and enable more reliable operation of HTS magnets with self-protecting feature. Furthermore, an NI magnet with its dimensionally least precise component eliminated from its winding, and thus its manufacturing errors reduced, will have a spatial field homogeneity inherently much better than its insulated counterpart. Equally important, because HTS itself has a thickness comparable to a typical insulation thickness, the overall size of an NI HTS magnet can be significantly reduced, leading to reduction in size and cost of a high-field LTS/HTS NMR magnet system. Considering that the price of an NMR magnet is one of the decisive factors in capital investment for most laboratories, we believe that less expensive NMR magnets derived from the NI HTS magnet technology will have a huge impact on the high-field NMR magnet industry. Success of this program will demonstrate elegant and practical solutions to mechanical, stability, and protection issues fundamental to LTS/HTS NMR magnets. More generally, the NI technique will benefit most applications relying on DC HTS magnets that are compact, mechanically robust, stable (reliable), protected, and competitive in price.