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Type: Artigo de periódico
Title: Longitudinal dynamics with rf phase modulation in the Brazilian electron storage ring
Author: Abreu, NP
Farias, RHA
Tavares, PF
Abstract: In the Brazilian synchrotron light source (LNLS - Laboratorio Nacional de Luz Sincrotron), 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 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 as a function of the modulation frequency and amplitude. The experimental results are in good agreement with theoretical expectations.
Country: EUA
Editor: Amer Physical Soc
Rights: aberto
Identifier DOI: 10.1103/PhysRevSTAB.9.124401
Date Issue: 2006
Appears in Collections:Unicamp - Artigos e Outros Documentos

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