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IEEE Trans Appl Supercond. 2019 Aug;29(5). pii: 4300605. doi: 10.1109/TASC.2019.2898704. Epub 2019 Feb 11.

Design of a Tabletop Liquid-Helium-Free 23.5-T Magnet Prototype towards 1-GHz Microcoil NMR.

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Francis Bitter Magnet Laboratory / Plasma Science and Fusion Center, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.


We present a design study of a liquid-helium (LHe)-free 23.5-T, ϕ25-mm RT-bore REBCO magnet for high-resolution 1-GHz microcoil nuclear magnetic resonance (NMR) spectroscopy. A microcoil NMR magnet is compact and thus its cost will be less by nearly an order of magnitude than that of the standard NMR magnet, and placeable on a bench, thereby resulting in a large saving in space. In addition, LHe-free operation enables the user to be independent from a cooling source in short supply. This paper includes: 1) magnet design and conductor requirement specification; 2) conceptual design of a full-scale tabletop LHe-free 1-GHz NMR magnet; and 3) design of a 10-K operating REBCO 23.5-T magnet prototype with a ϕ20-mm cold-bore. This small-size magnet prototype will be built and tested by 2020 for validation of performance and manufacturing challenges such as splices between coils. The paper concludes with discussion of stray-field shielding methods and a screening-current-inducing field (SCF) effect.


High-field magnet; Liquid-helium-free; Micro-coil NMR; REBCO; Tabletop

[Available on 2020-08-01]

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