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Simulation of the Magnetic Induction Vector of a Magnetic Core to be Used in FFC NMR Relaxometry

Roque, A. Roque ; Ramos, S. Ramos ; Barão, J. Barão ; Machado, VMM ; Sousa, D. M. Sousa

Journal of Superconductivity and Novel Magnetism Vol. 26, Nº 1, pp. 133 - 140, January, 2013.

ISSN (print): 1557-1939
ISSN (online): 1557-1947

Journal Impact Factor: (in )

Digital Object Identifier: 10.1007/s10948-012-1709-8

This paper is a contribution for the assessment and comparison of magnet properties based on magnetic field characteristics particularly concerning the magnetic induction uniformity in the air gaps. For this aim, a solver was developed and implemented to determine the magnetic field of a magnetic core to be used in Fast Field Cycling (FFC) Nuclear Magnetic Resonance (NMR) relaxometry.
The electromagnetic field computation is based on a 2D
finite-element method (FEM) using both the scalar and the
vector potential formulation. Results for the magnetic field
lines and the magnetic induction vector in the air gap are
presented. The target magnetic induction is 0.2 T, which is a
typical requirement of the FFC NMR technique, which can
be achieved with a magnetic core based on permanent magnets
or coils. In addition, this application requires high magnetic
induction uniformity. To achieve this goal, a solution
including superconducting pieces is analyzed. Results are
compared with a different FEM program.