A More Homogeneous, Less Massive Halbach Magnet array for Portable NMR

Author

Jizhong, Chen ; Yiming, Zhang ; Chunyan, Xu

Author_Institution

Chinese Acad. of Sci., Beijing

fYear

2007

Abstract

A more homogeneous, less massive Halbach magnet array for portable NMR was presented. Based on the general theory of cylindrical magnet, we describe a construction and performance of a small cylindrical magnet using crescent-shaped configuration to improve the 2D field homogeneity, and a novel test tube magnet (TTM) composed of a dipole cylinder magnet and a hemi-sphere magnet at one end to improve the 3D field homogeneity. The improved field of cylindrical magnet, with inner radii, 30 mm, and outer radii, 35 mm, is simulated by ANSOFT MAXWELL 3D and MATLAB. Flux density elements are effectively corrected in the homogeneous magnetic field region. The homogeneity increases, the magnet volumes and mass are relatively decreased, and the construction is very reasonable. Taken together the new designs have improved characteristics for portable NMR.

Keywords

magnetic flux; magnets; mathematics computing; nuclear magnetic resonance; 2D field homogeneity; 3D field homogeneity; ANSOFT MAXWELL 3D; Halbach magnet array; MATLAB; crescent-shaped configuration; dipole cylinder magnet; flux density; hemi-sphere magnet; portable NMR; small cylindrical magnet; test tube magnet; Geometry; Instruments; Magnetic devices; Magnetic flux; Nuclear magnetic resonance; Permanent magnets; Saturation magnetization; Superconducting magnets; Testing; Time to market; Field Compensation; Halbach Arrays; Portable NMR; Test Tube Magnet (TTM);

fLanguage

English

Publisher

ieee

Conference_Titel

Electronic Measurement and Instruments, 2007. ICEMI '07. 8th International Conference on

Conference_Location

Xi´an

Print_ISBN

978-1-4244-1136-8

Electronic_ISBN

978-1-4244-1136-8

Type

conf

DOI

10.1109/ICEMI.2007.4350455

Filename

4350455