Beam Matching, Steering, and Design Using a CDC-924, an Oscilloscope, and Programs Developed at Argonne National Laboratory

Abstract

Computer programs have been developed at Argonne National Laboratory (ANL) to match given input beam phase-space conditions to desired output conditions in a system with up to six quadrupoles. An oscilloscope will produce beam envelopes, trace rays, or produce phasespace diagrams at given locations in a much larger simulated beam system. Provisions are available for treating off-axis and off-momentum beams. Elements include slits, drift space, quadrupoles, and bending magnets. The phasespace configuration accepted by a system with displaced elements, off-momentum beams, asymmetrically placed slits, and element apertures can be displayed on the oscilloscope. These features have been used to design experimental beams, tune the Zero Gradient Synchrotron (ZGS) external proton beam, and steer the ZGS external proton beam. Excellent agreement has been found between the program predictions and actual beam parameters. Measurements of beam spot sizes at one or more locations have been used to compute beam phase-space conditions which are subsequently used in the other programs. The programs used have been entitled WIEMNY, MATCH, and QUISP.