Digital Flux Injectors for Superconducting NMR Magnets

描述（由申请人提供）：该延续项目的具体目标是：1）建造和操作一个全尺寸通量泵; 2）将其耦合到HTS插入件（插入1）阶段1 LTS/HTS NMR磁体; 3）在持续模式下有效操作阶段1磁体;以及4）证明了用于由LTS磁体和HTS插入件组成的高场NMR磁体的通量泵的实用性，该磁体配置被认为对于1GHz和更高分辨率的NMR磁体是必要的。 该延续项目将在“高分辨率NMR磁体超导磁通泵”项目中开发的磁通泵技术应用于FBML正在完成的LTS/HTS NMR磁体，该项目目前正在进行，计划于2002年5月结束。 这个延续项目的意义有三个方面，所有这些对于在1 GHz及以上频率范围内推进高分辨率NMR磁体都很重要，这些磁体必须由低超导和高超导（LTS/HTS）磁体组成。 1)操作，第一次，一个实际的磁通泵，耦合到一个真实的工作的高分辨率LTS/HTS NMR磁体在4.2K下工作。 2)首次在LTS/HTS NMR磁体中实现可接受的有效频率波动。因为在插入物1中超导拼接DP线圈的技术还有待开发，所以耦合到通量泵的该特定相位1 NMR磁体的预期频率波动在0.1- 1 ppm的范围内。 3)也是第一次演示磁通泵在高分辨率LTS/HTS NMR磁体中的实际应用。

DESCRIPTION (provided by applicant): The specific aims of this continuation project are to: 1) build and operate a full-scale flux pump; 2) couple it to the HTS insert (Insert 1) of the Phase 1 LTS/HTS NMR magnet; 3) operate the Phase 1 magnet effectively in persistent mode; and 4) demonstrate the utility of a flux pump for a high-field NMR magnet comprised of an LTS magnet and HTS insert, the magnet configuration considered essential for 1 GHz and above high-resolution NMR magnets. This continuation project applies a flux pump technology developed in the "Superconductor Flux Pump for High-Resolution NMR Magnets" project, ongoing now and scheduled to end in 5/02,to an LTS/HTS NMR magnet being completed at FBML. The significance of this continuation project is three fold, all important for the advancement of high-resolution NMR magnets in the frequency range 1 GHz and beyond, which by necessity must be comprised of both low- and high-superconducting (LTS/HTS) magnets. 1) Operation, for the first time, of a practical flux pump that is coupled to a real working high-resolution LTS/HTS NMR magnet operating at 4.2K. 2) Achievement, also for the first time, of acceptable effective frequency fluctuations in an LTS/HTS NMR magnet. Because techniques to superconductively splice DP coils in Insert 1 are yet to be developed, an expected frequency fluctuation of this particular Phase 1 NMR magnet coupled to a flux pump is in the range 0.1-1ppm. 3) Demonstration, also for the first time, of flux pump's practical utility for high-resolution LTS/HTS NMR magnets.