Journal Article

PreJuSER-10806

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Dipolar Halbach Magnet Stacks Made from Identically Shaped Permanent Magnets for Magnetic Resonance

Soltner, H. ; Blümler, P.FZJ*

2010
Wiley Chichester [u.a.]

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Please use a persistent id in citations: doi:10.1002/cmr.a.20165

Abstract: NMR Mandhalas (Magnetic Arrangement for Novel Discrete Halbach LAyout) are arrays of identically shaped magnets in a Halbach-type arrangement. They provide a simple and cost-effective way to generate high magnetic fields for mobile applications, for example, in magnetic resonance. Based on the introductory publication by Raich and Blumler (Concepts Magn Reson 2004;23B:16-25), we extend the notion of Mandhalas from cube-shaped magnets to polygonal and cylindrical ones and present construction guidelines for the stacking of such rings to generate homogeneous magnetic fields over larger volumes. For this purpose, we present formulas and numerical values based on a dipole approach to calculate the flux density of single rings and composed 3D systems and compare to corresponding results obtained by 3D boundary element method calculations. As an application of the approach presented here, we constructed prototypes. (C) 2010 Wiley Periodicals, Inc. Concepts Magn Reson Part A 36A: 211-222, 2010.

Keyword(s): J ; homogeneity (auto) ; NMR (auto) ; MRI (auto) ; EPR (auto) ; ESR (auto) ; Mandhala (auto) ; magic ring (auto) ; portable (auto) ; mobile (auto) ; permanent magnet (auto)

Note: The authors would like to thank the following persons at FZJ for their support and help in designing and constructing the magnets and for fruitful discussions. Axel Dahmen, Dagmar van Dusschoten, Harald Gluckler, Normen Hermes, Johannes Kochs, Marion Menzel, Elmar Mommertz, Uli Schurr, and Carel Windt.

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Research Program(s):

1. Terrestrische Umwelt (P24)

Appears in the scientific report 2010

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