Phase 3A of a 3-phase 1.3-GHz LTS/HTS NMR magnet

描述（由申请人提供）：2000年，NCRR授予麻省理工学院Francis Bitter磁体实验室一个三期项目的第一阶段计划，以完成由低温超导（LTS）磁体和高温超导（HTS）插入体组成的1 ghz核磁共振磁体。随着700 MHz LTS/HTS磁体（600 MHz LTS磁体和100 MHz HTS插入体）的成功完成以及第二阶段计划即将结束，我们准备开始第三阶段，第一阶段3A，随后是3B阶段，升级目标是完成1.3 GHz LTS/HTS核磁共振磁体（LH1.3G）。将核磁共振扩展到更高频率的两个最令人信服的理由是更好的光谱分辨率和灵敏度。3A阶段计划的具体目标是：1)完成一个600 MHz的全hts插入（H600），并在FBML已经提供的500 MHz LTS核磁共振磁体（L500）的孔中操作它，不仅产生1.1 GHz的磁场（25.84 T），而且还使H600受到足够的磁场和机械应力，以证明其在3B阶段700 MHz LTS磁体（L700）的孔中成功的性能；2)测量H600自身及与L500结合屏蔽电流场产生的谐波误差；3)开发应用于lh1.3 3g的技术，改善H600的谐波误差。3B期项目的具体目标是：1)完成高分辨率1.3 GHz LTS/HTS核磁共振磁体，由3A期完成的H600和新的L700相结合实现；2)在FBML的MIT/Harvard核磁共振中心安装lh1.3 3g作为核磁共振研究的一个新的强大工具。3A阶段计划的意义在于它对LH1.3G的直接和不可缺少的好处，其中H600将与L700一起构成两个关键的磁铁部件。3A阶段的重要目标，所有这些都是完成3B阶段高分辨率1.3 GHz LTS/HTS核磁共振磁体所需的基本要素：1)完成能够在LTS 700-MHz核磁共振磁体（L700）背景场中工作的600 MHz HTS （H600）插入；2)完成1.1 ghz核磁共振磁体，包括H600和500 mhz LTS核磁共振磁体；3) H600的磁性表征。将核磁共振扩展到更高场的两个最有说服力的论点是光谱分辨率和灵敏度。

DESCRIPTION (provided by applicant): In 2000, the NCRR awarded the MIT Francis Bitter Magnet Laboratory a Phase 1 program of a 3-phase project to complete a 1-GHz NMR magnet comprised of a low- temperature superconducting (LTS) magnet and a high-temperature superconducting (HTS) insert. With the successful completion of a 700-MHz LTS/HTS magneta 600- MHz LTS magnet and a 100-MHz HTS insertand the Phase 2 program about to end, we are poised to embark on Phase 3, first Phase 3A, to be followed by Phase 3B with an upgraded goal of completing a 1.3 GHz LTS/HTS NMR magnet (LH1.3G). The two most compelling arguments for extending NMR to higher frequencies are better spectral resolution and sensitivity. The specific aims of the Phase 3A program are to: 1) complete a 600-MHz all-HTS insert (H600) and operate it in the bore of a 500 MHz LTS NMR magnet (L500), already available at FBML, not only to generate a 1.1 GHz field (25.84 T) but also to subject H600 to a magnetic field and mechanical stresses sufficient enough to demonstrate its successful performance in the bore of a 700-MHz LTS magnet (L700) in Phase 3B; 2) measure the harmonic errors generated by screening- current fields of H600 itself and in combination with L500; and 3) develop techniques, to be applied to LH1.3G, to ameliorate the harmonic errors of H600. The specific aims of the Phase 3B program are to: 1) complete a high-resolution 1.3 GHz LTS/HTS NMR magnet, achieved with a combination of H600 completed in Phase 3A and a new L700; and 2) install the LH1.3G as a new powerful tool for NMR research in the MIT/Harvard Center for Magnetic Resonance at FBML. The significance of the Phase 3A program is its direct and indispensable benefit to LH1.3G, in which H600, together with L700, will constitute two key magnet components.Significant goals in Phase 3A, all of which are essential elements required to complete a high-resolution 1.3 GHz LTS/HTS NMR magnet in Phase 3B: 1) completion of a 600 MHz HTS (H600) insert capable of operating in a background field of an LTS 700-MHz NMR magnet (L700); 2) completion of a 1.1-GHz NMR magnet comprising the H600 and an 500-MHz LTS NMR magnet; 3) the magnetic characterization of H600. The two most compelling arguments for extending NMR to higher field are spectral resolution and sensitivity.