Reduction and compensation of the transient beam loading effect in a double rf system of synchrotron light sources

Double rf systems are used to lengthen the beam bunches in synchrotron light sources. In such a system, the performance of the bunch lengthening is limited by the transient beam-loading effect, which is induced by gaps in the fill pattern. To improve its performance, we investigate an application of...

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Main Authors: Naoto Yamamoto, Takeshi Takahashi, Shogo Sakanaka
Format: Article
Language:English
Published: American Physical Society 2018-01-01
Series:Physical Review Accelerators and Beams
Online Access:http://doi.org/10.1103/PhysRevAccelBeams.21.012001
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spelling doaj-0fab3fd06ee34e3cb0b42c2871be28a32020-11-24T23:35:51ZengAmerican Physical SocietyPhysical Review Accelerators and Beams2469-98882018-01-0121101200110.1103/PhysRevAccelBeams.21.012001Reduction and compensation of the transient beam loading effect in a double rf system of synchrotron light sourcesNaoto YamamotoTakeshi TakahashiShogo SakanakaDouble rf systems are used to lengthen the beam bunches in synchrotron light sources. In such a system, the performance of the bunch lengthening is limited by the transient beam-loading effect, which is induced by gaps in the fill pattern. To improve its performance, we investigate an application of a normal-conducting harmonic cavity, which is based on the TM020 resonant mode. By using the TM020 mode with low R/Q and high Q, fluctuation of the rf voltage due to the transient beam loading can be reduced significantly. The remaining small fluctuation of the rf voltage can be compensated by using an active feedforward technique. Using these measures, we expect to realize a bunch-lengthening performance that is comparable to that obtained with superconducting cavities under realistic operational parameters of a proposed 3-GeV next-generation light source. We estimate the bunch-lengthening performances using macroparticle tracking simulations together with semianalytical calculations.http://doi.org/10.1103/PhysRevAccelBeams.21.012001
collection DOAJ
language English
format Article
sources DOAJ
author Naoto Yamamoto
Takeshi Takahashi
Shogo Sakanaka
spellingShingle Naoto Yamamoto
Takeshi Takahashi
Shogo Sakanaka
Reduction and compensation of the transient beam loading effect in a double rf system of synchrotron light sources
Physical Review Accelerators and Beams
author_facet Naoto Yamamoto
Takeshi Takahashi
Shogo Sakanaka
author_sort Naoto Yamamoto
title Reduction and compensation of the transient beam loading effect in a double rf system of synchrotron light sources
title_short Reduction and compensation of the transient beam loading effect in a double rf system of synchrotron light sources
title_full Reduction and compensation of the transient beam loading effect in a double rf system of synchrotron light sources
title_fullStr Reduction and compensation of the transient beam loading effect in a double rf system of synchrotron light sources
title_full_unstemmed Reduction and compensation of the transient beam loading effect in a double rf system of synchrotron light sources
title_sort reduction and compensation of the transient beam loading effect in a double rf system of synchrotron light sources
publisher American Physical Society
series Physical Review Accelerators and Beams
issn 2469-9888
publishDate 2018-01-01
description Double rf systems are used to lengthen the beam bunches in synchrotron light sources. In such a system, the performance of the bunch lengthening is limited by the transient beam-loading effect, which is induced by gaps in the fill pattern. To improve its performance, we investigate an application of a normal-conducting harmonic cavity, which is based on the TM020 resonant mode. By using the TM020 mode with low R/Q and high Q, fluctuation of the rf voltage due to the transient beam loading can be reduced significantly. The remaining small fluctuation of the rf voltage can be compensated by using an active feedforward technique. Using these measures, we expect to realize a bunch-lengthening performance that is comparable to that obtained with superconducting cavities under realistic operational parameters of a proposed 3-GeV next-generation light source. We estimate the bunch-lengthening performances using macroparticle tracking simulations together with semianalytical calculations.
url http://doi.org/10.1103/PhysRevAccelBeams.21.012001
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AT takeshitakahashi reductionandcompensationofthetransientbeamloadingeffectinadoublerfsystemofsynchrotronlightsources
AT shogosakanaka reductionandcompensationofthetransientbeamloadingeffectinadoublerfsystemofsynchrotronlightsources
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