1. COUPLING IMPEDANCES OF LUMPED KIK-

At high particle intensities coherent transverse beam oscillations may be excited due to the coupling of the beam to individual accelerators components. The cha-racteristic values to describe these beam instabilities are the longitudinal- and transverse coupling impedances. One reason for this beam instability is the inductive in-teraction between the beam and the lumped kicker ma-gnets. The type of the magnet, e.g. window-frame ma-gnet or C-magnet, and his external electric network are the most important quantities to identify the coupling impedances below the cut-off frequency (for wavegiude modes) of the beam pipe. For the kicker modules in the SIS and ESR accelerators at GSI theoretical calculati-ons and measurement are presented