Abstract
The effect of non-linear betatron resonances on the lifetime of an accumulated electron beam was determined. Coherent vertical oscillations of a coasting beam were investigated. The growth rates and the thresholds for the modes n = 2, 3, 4, 5 were measured. A time correlation between the different modes was established. It was tried to influence the oscillations by making the clearing field electrodes resonate with the beam.
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