Design and experimental validation of Unilateral Linear Halbach magnet arrays for single-sided magnetic resonance

Journal of Magnetic Resonance
Ashvin BashyamMichael J Cima

Abstract

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.

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Citations

Jun 25, 2019·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Patrick C McDanielLawrence L Wald
Apr 30, 2019·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Tonima S AliKonstantin I Momot
Oct 22, 2019·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Ashvin BashyamMichael J Cima
Jul 26, 2019·Science Translational Medicine·Lina A ColucciMichael J Cima
Dec 2, 2020·Nature Biomedical Engineering·Ashvin BashyamMichael J Cima
Feb 2, 2021·Applied Magnetic Resonance·Joshua R Biller, Joseph E McPeak
Sep 24, 2019·Journal of Magnetic Resonance·Mason GreerSoumyajit Mandal
Aug 25, 2021·Journal of Magnetic Resonance·Ya WangZiyue Wu

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