Designing and Shimming Compact Iron-Core Dipole Magnets for NMR Spectroscopy

Methods, equations, and software tools for designing iron-core dipole magnets, developed by the accelerator physics community but not well known in the compact NMR community, are introduced here. Many of these tools are due to Klaus Halbach, including the equations accounting for the “excess flux” a...

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Bibliographic Details
Published inApplied magnetic resonance Vol. 54; no. 11-12; pp. 1663 - 1687
Main Authors McDowell, Andrew F., Lown, Robert R.
Format Journal Article
LanguageEnglish
Published Vienna Springer Vienna 01.12.2023
Springer Nature B.V
Subjects
Atoms and Molecules in Strong Fields
Design techniques
Dipoles
Iron
Laser Matter Interaction
Magnetic fields
Magnets
Mathematical analysis
NMR spectroscopy
Organic Chemistry
Original Paper
Physical Chemistry
Physics
Physics and Astronomy
Software
Solid State Physics
Spectroscopy/Spectrometry
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Summary:Methods, equations, and software tools for designing iron-core dipole magnets, developed by the accelerator physics community but not well known in the compact NMR community, are introduced here. Many of these tools are due to Klaus Halbach, including the equations accounting for the “excess flux” at the edges of the poles and the software for calculating the fields throughout the magnet structure. The advantages of using magnetic ink for passive shimming of compact magnets are discussed, and the details of the implementation of ink-based shims are presented. Examples of combining ink shimming with space-efficient high-order active shims in compact magnets demonstrate the possibilities of iron-core dipole magnets as platforms for inexpensive, manufacturable NMR-based device development.
ISSN:0937-9347
1613-7507
DOI:10.1007/s00723-023-01572-5