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，用于高场HTS NMR磁体的设计和构造，无绝缘（NI）HTS绕组，具有完全消除匝间绝缘的裸或减稳2G导体。在这个为期两年的项目中，我们将专注于两个具体目标：1）设计，建造和测试一个标准的54 mm温膛7 T（300 MHz）高温超导NI磁体，以证明所提出的NI技术用于实际NMR尺寸磁体的可行性;以及2）利用麻省理工学院弗朗西斯比特磁铁实验室（MIT Francis Bitter Magnet Laboratory）目前可用的300-MHz 2G NI磁体和300-MHz LTS背景NMR磁体产生14 T的组合场。这种组合14 T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体，并最大限度地减少了2G HTS绕组的稳定器厚度，因此它将增强机械完整性，并使具有自保护功能的HTS磁体能够更可靠地运行。此外，从其绕组中消除了其尺寸上最不精确的分量并且因此其制造误差减小的NI磁体将具有固有地比其绝缘对应物好得多的空间场均匀性。同样重要的是，由于HTS本身具有与典型绝缘厚度相当的厚度，因此NI HTS磁体的总体尺寸可以显著减小，从而降低高场LTS/HTS NMR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，我们相信，从NI HTS磁体技术中衍生出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LTS/HTS NMR磁体基本机械，稳定性和保护问题的优雅和实用的解决方案。更一般地说，NI技术将有利于大多数依赖于DC HTS磁体的应用，这些磁体紧凑、机械坚固、稳定（可靠）、受保护且价格具有竞争力。

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.