Operational results for the raster scanning power supply system constructed at the Bevalac Biomedical Facility

A raster scanning power supply for controlling an 8.0-T-m relativistic heavy-ion beam at the Bevalac Biomedical Facility has been completed recently and is undergoing electrical testing before online operation in 1989. The scanner system will provide tightly controlled beam uniformity and off-axis treatment profiles with large aspect ratios and unusual dimensions. Original specifications, agreement with measured results, and special device performance (i.e. gate turn-on thyristor switches, field-effect transistor actuator assembly, etc.) are discussed. Firing circuit tests have been completed, and full four quadrant operation with the beam through the magnet was demonstrated on March 15, 1989