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Longitudinal coupled bunch instabilities on the NSLS X-ray ring

By: Klaffky, R.W.; Wang, J.M.; Thomas, M.G.; Kramer, S.L.; D'Alsace, R.; Broome, W.;

1997 / IEEE / 0-7803-4376-X


This item was taken from the IEEE Conference ' Longitudinal coupled bunch instabilities on the NSLS X-ray ring ' Studies have demonstrated that an 862 MHz RF cavity higher order mode (HOM) causes longitudinal coupled-bunch (LCB) dipole and quadrupole oscillations at specific RF tuner positions with associated increases in longitudinal, horizontal, and vertical electron beam sizes. In the XRF2 cavity a reconfiguration of damping antennae removed the 862 MHz HOM. High speed I(t) stripline measurements showed that a strong quadrupole oscillation resulted when the HOM was induced in the XRF3 cavity. The reason that a symmetric six bunch pattern was found to be effective in damping this mode is explained.