Observation Of Vertical Betatron Sideband Due To Electron Clouds In The Kekb Low Energy Ring
PHYSICAL REVIEW LETTERS(2005)
摘要
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 blowup 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 blowup 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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关键词
limiting factor,particle acceleration,oscillations
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