EXPERIMENTS ON ELECTRON RINGS AT BERKELEY

During the past year or so experimental and theoretical work at Berkeley has been mainly concerned with trying to achieve, in a controlled and understandable way, compact high-intensity rings with high holding power. Enough problems with instabilities and other collective effects that cause degradation in ring quality have been observed in a variety of compressor configurations that we have been reluctant to attempt ion-acceleration experiments before having a good grasp of the phenomena limiting the attainment of high-quality rings. The present status of the equipment and experimental results are described, and the theoretical and experimental observations that are relevant to the formation of high-quality rings and that led to the evolution of the present equipment are discussed. (auth)