Charged particle directional control - deviation of a beam by an electromagnetic system independent of particle energy

摘要

Two pairs of electromagnets each with an air gap are constructed with the intermediate faces of the pairs parallel to each other and perpendicular to the direction of the particle beam. Each electromagnet has a pole piece in a quadrant shape. The deviation produced by the magnets is independent of the energy of the particles in the beam allowing achromatic control of beam direction.