Comparative study of helical-cut notch–coil magnets for fast-field-cycling nuclear magnetic resonance

Author:

Kruber S.1,Farrher G.D.1,Anoardo E.1

Affiliation:

1. Laboratorio de Relaxometría y Técnicas Especiales, Facultad de Matemática, Astronomía y Física, Universidad Nacional de Córdoba and IFEG - CONICET, Córdoba, Argentina.

Abstract

In this manuscript we describe an α-helical-cut notch–coil magnet system designed for fast switching of the magnetic field. An attempt was made to determine the extent to which such a magnet configuration can be efficiently used for fast-field-cycling (FFC) nuclear magnetic resonance (NMR) instruments. In addition to the typical technical requirements (high field-to-power ratio, adequate electric performance for fast-switching of the magnetic field and NMR-compatible magnetic field homogeneity), a tunable homogeneity within the sample volume and more uniform heat dissipation along the magnet body are included. A helical-cut notch–coil machined in metallic cylinders with external movable pieces was found to fit these requirements very well. A key factor for the optimization of the magnet parameters is the use of a novel calculation procedure based on a more realistic model that consider a magnet geometry with broken azimuthal symmetry. The aim of this paper is to theoretically compare the proposed geometry with other existing designs. No particular prototype is presented here. A clear understanding of the notch–coil performance was found to be an essential step for its further consideration as a potential autoadaptive (electronically controlled) magnet system for FFC applications.

Publisher

Canadian Science Publishing

Subject

General Physics and Astronomy

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