KEKB LER中电子云引起的垂直Betatron边带的观测
Observation of Vertical Betatron Sideband due to Electron Clouds in the KEKB LER
摘要：
电子云对正电荷束流的影响是近年来世界各地粒子加速器研究的一个活跃领域。由于电子云引起的横向电子束尺寸的爆炸已经在某些机器中被观察到，并且被认为是发展更高电流、更高亮度的电子-正电子对撞机的主要限制因素。目前提出的束流爆炸的主要机制是由于电子云内的短程尾流引起的快速头尾不稳定性的激发。我们在这里提出的观察束流的束流谱中的电子感应加速器振荡边带，可以提供直接的证据，这样的头-尾运动的正电子束。
英文摘要：
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 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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