Patent ID: 6950001
Filing Date: 2005-09-27
Classification: G01R

Abstract:
1. A magnet assembly comprising four sets of magnetic coils, each set of coils comprising windings of electrical conductive material; wherein: the sets of magnetic coils are arranged in quadrants, separated about two mutually perpendicular planes, including a midplane and a plane of reflection; the sets of coils are also symmetrical about a third plane that is perpendicular to both the midplane and the plane of reflection, such that the three planes are mutually orthogonal; each of the coils is wound around an axis that is perpendicular to the midplane; and the windings are configured such that, in operation, current flow in said coils is symmetrical about the plane of reflection and anti-symmetrical about the midplane, whereby a resultant net magnetic field is produced at a center of the assembly in a direction perpendicular to the plane of reflection.