Single Beam Instabilities in PETRA

One of the most important questions during the study and the construction period of PETRA was connected with the high particle intensity effects. Therefore the first high current experiments at PETRA were performed to study average current limitations, higher order mode losses, bunchlengthening, single bunch instabilities and single bunch current limitations. The first results show, that the strength of the observed effects remain within estimated limits, so that the currents are not limited below the design values.