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arXiv physics/0610083physics.acc-ph
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LNLS电子储存环中RF相位调制的纵向动力学

Longitudinal dynamics with RF phase modulation in the LNLS electron storage ring

N. P. Abreu, P. F. Tavares, R. H. A. Farias

摘要:

在巴西的同步加速器光源,我们观察到,调制的相位的加速场在大约两倍的同步频率抑制非常好的纵向耦合束流模式驱动的高阶模式(HOM)的射频(RF)腔之一。在这项工作中,我们提出了一组系统的测量结果,在单和多束模式,旨在表征RF相位调制的影响的光束。我们比较这些实验的跟踪模拟和理论模型的结果,其中朗道阻尼是稳定的机制,解释了抑制的纵向耦合束不稳定。我们还测量了通过相位调制在纵向相空间中产生的稳定岛的频率和作为调制频率和幅度的函数的纵向束传递函数(BTF)。实验结果与理论预期相符。

英文摘要:

In the Brazilian synchrotron light source, we observed that modulating the phase of the accelerating fields at approximately twice the synchrotron frequency suppressed remarkably well a longitudinal coupled-bunch mode of the beam driven by a higher order mode (HOM) in one of the radiofrequency (RF) cavities. In this work, we present the results of a set of systematic measurements, in single and multibunch mode, aimed at characterizing the effects of RF phase modulation on the beam. We compare those experiments with the results of tracking simulations and of a theoretical model in which Landau damping is the stabilizing mechanism that explains the suppression of the longitudinal coupled bunch instability. We also measure the frequency of the stable islands created in longitudinal phase space by phase modulation and the longitudinal beam transfer function (BTF) as a function of the modulation frequency and amplitude. The experimental results are in good agreement with theoretical expectations.

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