title: An open magnet utilizing ferro-refraction current magnification.
abstract: Ferro-refraction is the field magnification that is obtained when a current segment is near a high magnetic permeable boundary. It is shown that ferro-refraction may be used in the design of magnets for NMR or MRI to increase the efficiency of these magnets. The field may be modeled analytically with the Biot--Savart law and the inclusion of mirror image currents. Ferro-refraction is particularly useful in the design of monohedral magnets, magnets producing a remote homogeneous region which have the magnetic sources arranged to one side. These magnets have also been called planar magnets. Two designs for a monohedral magnet which produce good agreement between experimental and analytic results are presented.
authors.affiliation: Department of Radiology, Brigham and Women's Hospital, 75 Francis Street, Boston, Massachusetts 02115, USA.
authors.forename: Yuly
authors.initials: Y
authors.lastname: Pulyer
authors.forename: Mirko I
authors.initials: MI
authors.lastname: Hrovat