Beam Extraction System for the K=500 Superconducting Cyclotron

In addition to three electrostatic deflectors, the proposed extraction system contains six sets of "focusing bars." Calculations are presented to demonstrate the usefulness of these elements for both beam deflection and focusing. Next, the troublesome field perturbations produced by the focusing bars are discussed, together with the design for "compensating bars." Preextraction orbit calculations are then presented to show the evolution of the radial and axial phase space areas associated with the accelerating beam, and to demonstrate the effects of various resonances including those generated by the focusing bars.