Transverse field focused system

This patent describes a sheet beam system of charged particles, a transverse field focused system consisting of: pairs of spaced-apart inner and outer electrodes having concentric cylindrical-arc electrode surfaces with entry and exit edges parallel to the axis of curvature of the electrodes and side edges in planes perpendicular to the axis of curvature, the pairs of electrodes being arranged in serial manner with the exit edges of a pair of electrodes being spaced from and generally in line with the entry edges of the next pair of electrodes, means for impressing voltages on the electrodes of each pair thereof to create an electric field between the electrodes to guide the sheet beam of charged particles from the entry edges of the electrodes to the exit edges thereof and along a curved surface between the electrodes, the mean voltage on successive pairs of electrodes being progressively greater, and wherein both side edges of both electrodes of each pair thereof are bent toward the axis of curvature of the electrode surfaces to focus the beam edges