Operating Experience with the Resonance Extraction Slow Spill Control System at the Zero Gradient Synchrotron

Simultaneous resonance extraction to two proton lines became operational in spring of 1975. The spill quality was initially poor due to 100% structure in the two to six kHz range. This paper describes the empirical techniques developed to provide a smooth spill. These techniques consist of applying radial or azimuthal disturbances to the proton beam. It has been found that the most effective disturbing frequency depends uniquely on the beam momentum. Quite an array of new equipment had to be built for magnetic control of the unbunched beam. Brief descriptions of this equipment are provided.