INHOMOGENOUS FIELD WIEN FILTER DESIGN

The Wien velocity filter is a useful device that transports pure proton fraction from high-power ECR proton source to the RFQ. It is a deflecting device, which has crossed electrostatic, and magnetostatic fields. Both fields are perpendicular to the beam trajectory that deflects and eliminates the undesired species of ions from the main beam. A tilted-pole Wien filter [1] surpasses the classical parallel-rectangular-poles Wien filter in performance as the former eliminates the astigmatism. The present paper describes the design of an inhomogeneous field Wien filter where the equations of motion are developed and solved up to a second-order approximation for a paraxial ion beam inside an E×B mass separator without considering the space charge effects.