Abstract
Longitudinal multi-bunch oscillations are observed at the BESSY storage ring even with beam currents of 1-2 mA, although stored currents up to 970 mA can be achieved. With a double rf-system the threshold currents can be increased when operating the system in the tune splitting or in the `Landau'-cavity mode. A longitudinal impedance of ?Z/n??12 ? is obtained from bunchlength measurements. No transverse multi-bunch instabilities have been observed. This may be explained by Landau damping induced by the non-linear fields of the ions trapped in the beam.
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