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Beam loading compensation for optimal bunch lengthening with harmonic cavities

Emittance growth and short beam lifetime due to intra-beam scattering in extremely low emittance storage rings can be mitigated if harmonic RF cavities are used for the purpose of lengthening the longitudinal bunch size. The “flat potential condition” can be achieved with harmonic cavities, lengthen...

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Detalles Bibliográficos
Autores principales: Yamamoto, N, Takahashi, T, Sakanaka, S
Lenguaje:eng
Publicado: 2020
Materias:
Acceso en línea:https://dx.doi.org/10.23732/CYRCP-2020-009.96
http://cds.cern.ch/record/2751987
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author Yamamoto, N
Takahashi, T
Sakanaka, S
author_facet Yamamoto, N
Takahashi, T
Sakanaka, S
author_sort Yamamoto, N
collection CERN
description Emittance growth and short beam lifetime due to intra-beam scattering in extremely low emittance storage rings can be mitigated if harmonic RF cavities are used for the purpose of lengthening the longitudinal bunch size. The “flat potential condition” can be achieved with harmonic cavities, lengthening the bunch by a factor of ~5. However, the performance is limited by the transient beam-loading effect in the RF cavities, which is induced by gaps in the ring fill pattern. As a counter-measure of this effect, we have proposed the active compensation techniques by using a single kicker cavity having a bandwidth of several times the revolution frequency. The transient effect can be compensated when the kicker cavity voltage is determined to suppress bunch phase shifts along the train.
id oai-inspirehep.net-1844058
institution Organización Europea para la Investigación Nuclear
language eng
publishDate 2020
record_format invenio
spelling oai-inspirehep.net-18440582021-02-25T20:01:57Zdoi:10.23732/CYRCP-2020-009.96http://cds.cern.ch/record/2751987engYamamoto, NTakahashi, TSakanaka, SBeam loading compensation for optimal bunch lengthening with harmonic cavitiesAccelerators and Storage RingsEmittance growth and short beam lifetime due to intra-beam scattering in extremely low emittance storage rings can be mitigated if harmonic RF cavities are used for the purpose of lengthening the longitudinal bunch size. The “flat potential condition” can be achieved with harmonic cavities, lengthening the bunch by a factor of ~5. However, the performance is limited by the transient beam-loading effect in the RF cavities, which is induced by gaps in the ring fill pattern. As a counter-measure of this effect, we have proposed the active compensation techniques by using a single kicker cavity having a bandwidth of several times the revolution frequency. The transient effect can be compensated when the kicker cavity voltage is determined to suppress bunch phase shifts along the train.oai:inspirehep.net:18440582020
spellingShingle Accelerators and Storage Rings
Yamamoto, N
Takahashi, T
Sakanaka, S
Beam loading compensation for optimal bunch lengthening with harmonic cavities
title Beam loading compensation for optimal bunch lengthening with harmonic cavities
title_full Beam loading compensation for optimal bunch lengthening with harmonic cavities
title_fullStr Beam loading compensation for optimal bunch lengthening with harmonic cavities
title_full_unstemmed Beam loading compensation for optimal bunch lengthening with harmonic cavities
title_short Beam loading compensation for optimal bunch lengthening with harmonic cavities
title_sort beam loading compensation for optimal bunch lengthening with harmonic cavities
topic Accelerators and Storage Rings
url https://dx.doi.org/10.23732/CYRCP-2020-009.96
http://cds.cern.ch/record/2751987
work_keys_str_mv AT yamamoton beamloadingcompensationforoptimalbunchlengtheningwithharmoniccavities
AT takahashit beamloadingcompensationforoptimalbunchlengtheningwithharmoniccavities
AT sakanakas beamloadingcompensationforoptimalbunchlengtheningwithharmoniccavities