Journal
JOURNAL OF MAGNETIC RESONANCE
Volume 292, Issue -, Pages 36-43Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jmr.2018.05.004
Keywords
Single-sided NMR; Magnet design; Halbach magnet; Portable NMR; Permanent magnets
Funding
- MIT Institute for Soldier Nanotechnologies (United States Army Research Office) [W911NF-13D-0001]
- National Institutes of Health - National Cancer Institute Centers of Cancer Nanotechnology Excellence Grant [U54 CA151884-02]
- Hertz Foundation Graduate Fellowship
- National Science Foundation Graduate Fellowship
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Single-sided NMR has the potential for broad utility and has found applications in healthcare, materials analysis, food quality assurance, and the oil and gas industry. These sensors require a remote, strong, uniform magnetic field to perform high sensitivity measurements. We demonstrate a new permanent magnet geometry, the Unilateral Linear Halbach, that combines design principles from sweet-spot and linear Halbach magnets to achieve this goal through more efficient use of magnetic flux. We perform sensitivity analysis using numerical simulations to produce a framework for Unilateral Linear Halbach design and assess tradeoffs between design parameters. Additionally, the use of hundreds of small, discrete magnets within the assembly allows for a tunable design, improved robustness to variability in magnetization strength, and increased safety during construction. Experimental validation using a prototype magnet shows close agreement with the simulated magnetic field. The Unilateral Linear Halbach magnet increases the sensitivity, portability, and versatility of single-sided NMR. (C) 2018 Elsevier Inc. All rights reserved.
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