Observation of Vertical Betatron Sideband due to Electron Clouds in the KEKB LER

Details Observation of Vertical Betatron Sideband due to Electron Clouds in the KEKB LER Observation of Vertical Betatron Sideband due to Electron Clouds in the KEKB LER

2004-07-30

arxiv.org/abs/physics/0407149v3

Phys.Rev.Lett. 94 (2005) 054801

Physics

Accelerator Physics

5 pages, 7 figures, submitted to Phys. Rev. Lett; expanded discussion, fixed figure, fixed typos; shortened for publication

Scientific paper

10.1103/PhysRevLett.94.054801

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.

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