The as-built lattice of the Rapid-Cycling Synchrotron (RCS) had two sets of correction sextupoies and two sets of quadrupcies energized by dc power supplies to control the tune and the tune tilt. With this method of powering these magnets, adjustment of tune conditions during the accelerating cycle as needed was not possible. A set of dynamically programmable power supplies has been built and operated to provide the required chromatic:ty adjustment. The short accelerating time (16.7 ms) of the RCS and the Inductance of the magnets dictated large transistor amplifier power supplies. The required time resolution and waveform flexibility indicated the desirability of computer control. Both the amplifiers and controls are described, along with resulting improvements in the beam performance. A set of octupole magnets and programmable power supplies with similar dynamic qualities have been constructed and insxalled to control the anticipated high-intensity transverse instability. This system uill be operational in the spring of 1981.
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 unbundled beam. Brief descriptions of this equipment are provided.
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