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| MOPAB155 |
Characterization of the Longitudinal Acceptance in a Storage Ring with RF Pinger |
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- G.M. Wang, B. Holub, Y. Li, J. Rose, T.V. Shaftan
BNL, Upton, Long Island, New York, USA
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In modern generation light sources, it is desired to have SR performance at high beam current, low horizontal emittance with small coupling, resulting in intense Touschek scattering, which is the dominant limitation of beam lifetime. Touschek scattering strongly depends on momentum aperture. Understanding momentum aperture is extremely important. NSLS II storage ring RF system has the digital ramp control function, enabling rapid change of the cavity phase and amplitude. This makes the possibility to ping the beam in longitudinal phase space and directly measure the longitudinal acceptance, in contrast with traditional indirect way to understand it from other aspect of parameters. In this paper, we present the tool, longitudinal pinger, its application to characterize NSLS II longitudinal acceptance and localize the momentum aperture limit with SR BPMs.
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| DOI • |
reference for this paper
※ https://doi.org/10.18429/JACoW-IPAC2017-MOPAB155
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