Patent ID: 7399534
Filing Date: 2008-07-15
Classification: H01F,Y10T

Abstract:
1. A cylindrical magnetic field gradient source structure, comprising: a plurality of nested cylindrical magnetic laminae being layered in a magnetic cylinder; said magnetic cylinder having an outer surface, a pair of opposing poles, a radial dimension, t, and a center; each of said plurality of nested cylindrical magnetic laminae being thinner than a cylindrical radius and having a magnetic charge distribution, a magnetic orientation perpendicular to their planes and a variable magnetic strength, M(r); said magnetic cylinder being configured to cancel unpaired negative surface charges from said outer surface; said variable magnetic strength, M(r), varies linearly with a normal distance, r, from said center; a working space within said structure; said perpendicular magnetic orientation and said variable magnetic strength, M(r), generating a uniform volume magnetic charge density, ρ, for said magnetic cylinder, a magnetic field, M, perpendicular to said magnetic cylinder, a maximum cylindrical magnetization, M(t), and a magnetic gradient with a linear dependence of magnetic field; and said uniform volume magnetic charge density, ρ, varies abruptly from a one of said plurality of nested cylindrical magnetic laminae to another one of said plurality of nested cylindrical magnetic laminae.