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Longitudinal coupled bunch instabilities on the NSLS X-ray ring
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.
Higher Order Mode
Electron Beam Size
Particle Beam Bunching
Particle Beam Stability
Accelerator Rf Systems
Longitudinal Coupled-bunch Oscillations