Beam Stabilization and Automatic Energy Variation at the Bonn Isochronous Cyclotron

Control systems have been developed for the stabilization of the external cyclotron beam with respect to the horizontal and vertical alignment, the beam energy and the beam intensity. The operating characteristics of the feedback circuits are presented and the joint operation is discussed. The incorporation of the control systems into a microcomputer controlled energy variation program makes it possible to obtain a reliable and convenient system for the automatic measurement of excitation functions with an isochronous cyclotron.