Electrostatic Septum For Kilowatt Heavy Ion Beams

A septum of improved design has replaced the standard tungsten septum with uniform thickness used in the deflector for the K1200 cyclotron at Michigan State University.[1] A V-notch in the leading edge enhanced radiation cooling, and an increased septum thickness away from the median plane enhanced conduction of heat to the water cooled housing, Previously observed degradation of beam transmission attributed to thermally induced deformation of the septum was greatly improved with the new septum. The demonstrated power dissipation with an Ar beam was 900 W.