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

描述(由申请人提供)：我们提出了一种创新的方法，用于设计和制造高场高温超导核磁共振磁体，无绝缘(NI)高温超导绕组，带有裸露或简化稳定器2G导体，完全消除了匝间绝缘。在这项为期两年的计划中，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温孔7-T(300 MHz)高温超导NI磁体，以证明所建议的NI技术在实际核磁共振大小磁体中的可行性；以及2)在MIT Francis Bitter Magnet实验室现有的300-MHz 2G NI磁体和300-MHz LTS背景核磁共振磁体的组合下产生14T的磁场。这种14-T组合磁体的成功将验证NI磁体在高场(GHz级)LTS/HTS核磁共振应用中的技术可行性。由于紧凑型NI绕组基本上去除了软的匝间绝缘子，并将2G高温超导绕组的稳定器厚度降至最低，因此它将提高机械完整性，并使具有自我保护功能的高温超导磁体能够更可靠地运行。此外，从绕组中去掉尺寸上最不精确的部件，从而减少制造误差的镍离子磁体，其空间场均匀度将固有地比其绝缘磁体好得多。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，因此可以显著减小NI高温超导磁体的整体尺寸，从而降低高场LTS/HTS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进行资本投资的决定性因素之一，我们相信，源自NI高温超导磁体技术的价格较低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。该项目的成功将展示对LTS/HTS核磁共振磁体基本的机械、稳定性和保护问题的优雅而实用的解决方案。更广泛地说，NI技术将使大多数依赖于直流高温超导磁体的应用受益，这些磁体紧凑、机械坚固、稳定(可靠)、受保护，并且在价格上具有竞争力。

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.