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首页> 外文期刊>Journal of magnetic resonance >Achieving 1 ppm field homogeneity above 24 T: Application of differential mapping for shimming Keck and the Series Connected Hybrid magnets at the NHMFL
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Achieving 1 ppm field homogeneity above 24 T: Application of differential mapping for shimming Keck and the Series Connected Hybrid magnets at the NHMFL

机译：在24t上以上实现1 ppm域同质性：在NHMFL处的仿制矩形和串联连接的混合磁铁的应用

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摘要

Powered resistive and resistive-superconductive hybrid magnets can reach fields higher than superconducting NMR magnets but lack the field homogeneity and temporal stability needed for high resolution NMR. Due to field fluctuations in powered magnets, commercially available mapping systems fail to produce maps of these magnets with sufficient reproducibility, thus hampering attempts to improve homogeneity of the field they generate. Starting with a commercial mapper, we built a mapping system which uses a two-channel (measurement + reference) mapper probe. We used this system to map and then to shim two magnets of Florida Bitter type at the National High Magnetic Field Laboratory in Tallahassee, FL. With a combination of passive (ferromagnetic) and active shims we achieved 2.3 ppm homogeneity in 1 cm diameter spherical volume (dsv) at 25.0 T in the Keck resistive magnet, and 0.9 ppm homogeneity in 1 cm dsv at 23.5, 28.2, and 35.2 T in the series-connected resistive-superconductive hybrid (SCH) magnet. (C) 2019 Elsevier Inc. All rights reserved.
机译：动力电阻和电阻超导混合磁体可以达到高于超导NMR磁体的场，但缺乏高分辨率NMR所需的现场均匀性和时间稳定性。由于动力磁铁中的场波动，市售的映射系统不能产生具有足够重复性的这些磁体的图，从而阻碍了改善它们产生的场的均匀性的尝试。从商业映射器开始，我们构建了一个使用双通道（测量+参考）映射探头的映射系统。我们使用该系统地图，然后在Tallahassee，FL的全国高磁场实验室施加到南芦米苦型的薄膜。具有无源（铁磁性）和有源垫片的组合，我们在凯克电阻磁铁中的25.0℃下在1cm直径的球形体积（DSV）中实现了2.3ppm均匀性，在23.5,28.2和35.2℃下在1cm DSV中为0.9ppm均匀性在串联电阻超导混合动力（SCH）磁铁中。 （c）2019 Elsevier Inc.保留所有权利。

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