Observation of Vertical Betatron Sideband due to Electron Clouds in the KEKB LER
Abstract
The effects of electron clouds on positively-charged beams have been an active area of research in recent years at particle accelerators around the world. Transverse beam-size blow-up due to electron clouds has been observed in some machines, and is considered to be a major limiting factor in the development of higher-current, higher-luminosity electron-positron colliders. The leading proposed mechanism for beam blow-up is the excitation of a fast head-tail instability due to short-range wakes within the electron cloud. We present here observations of betatron oscillation sidebands in bunch-by-bunch spectra that may provide direct evidence of such head-tail motion in a positron beam.
Keywords
Cite
@article{arxiv.physics/0407149,
title = {Observation of Vertical Betatron Sideband due to Electron Clouds in the KEKB LER},
author = {J. W. Flanagan and K. Ohmi and H. Fukuma and S. Hiramatsu and M. Tobiyama and E. Perevedentsev},
journal= {arXiv preprint arXiv:physics/0407149},
year = {2009}
}
Comments
5 pages, 7 figures, submitted to Phys. Rev. Lett; expanded discussion, fixed figure, fixed typos; shortened for publication