Performance and Modifications of a 200 keV Heavy Ion Accelerator Facility

An air isolated 200 keV heavy ion Accelerator has been in operation for more than four years at our laboratory. We report on our experience with this machine and present a mass analysis for CO gas. The magnetic analyzing system has a stability of better than 0.01% without a feedback network. The 2 1/2 ton analyzing magnets are mounted on pneumatic feet allowing positioning of the two magnets in any desirable configuration. Described is the vacuum system which permits us to bombard targets essentially without carbon buildup. The machine is being modified to produce ions up to mass number 250u andan operating energy of 400 keV.