Hollow substantially hemispherical permanent magnet high-field flux source

摘要

A hollow hemispherical flux source produces a uniform high-field in its central cavity. The hemisphere is comprised of a selected magnetic material whose magnetization is azimuthally symmetrical. The magnetic orientation ( alpha ) in the hemispherical permanent magnet shell is given by the equation: alpha =2 theta where theta is the polar angle. A planar plate of high saturation, high permeability material closes the open end of the hemisphere. An axial bore hole through the hemisphere and/or through the planar plate provides the requisite accessability.