Patent ID: 8058626
Filing Date: 2011-11-15
Classification: G21K,H01J

Abstract:
1. A method of modifying a ribbon-shaped ion beam having an elongate cross-section normal to a beam direction, wherein at any position along said ribbon-shaped beam an orthogonal (x, y, z) Cartesian co-ordinate system is defined in which a z-axis of the co-ordinate system extends in the beam direction at a center line of said ribbon-shaped beam, an x-axis extends in a long direction of said elongate cross-section of said ribbon-shaped beam and a y-axis extends in a short direction of said elongate cross-section, the method comprising the step of: generating at a predetermined position along the ribbon-shaped beam a magnetic field extending in an x-direction along said x-axis, said x-direction magnetic field having a non-uniform intensity which is a desired function of x.