Electron cloud effects in SuperKEKB commissioning

A vertical emittance growth (beam size blow-up) due to electron cloud has been observed in the positron low energy ring (LER) in Phase-I commissioning (2016) of SuperKEKB. The emittance growth is caused by fast head-tail instability due to wake force induced by electron cloud. The emittance growth w...

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Detalles Bibliográficos
Autores principales: Ohmi, K, Flanagan, J, Fukuma, H, Ikeda, H, Mulyani, E, Shibata, K, Suetsugu, Y, Tobiyama, M
Lenguaje:eng
Publicado: 2020
Materias:
Accelerators and Storage Rings
Acceso en línea:https://dx.doi.org/10.23732/CYRCP-2020-007.179
http://cds.cern.ch/record/2737329
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author Ohmi, K
Flanagan, J
Fukuma, H
Ikeda, H
Mulyani, E
Shibata, K
Suetsugu, Y
Tobiyama, M
author_facet Ohmi, K
Flanagan, J
Fukuma, H
Ikeda, H
Mulyani, E
Shibata, K
Suetsugu, Y
Tobiyama, M
author_sort Ohmi, K
collection CERN
description A vertical emittance growth (beam size blow-up) due to electron cloud has been observed in the positron low energy ring (LER) in Phase-I commissioning (2016) of SuperKEKB. The emittance growth is caused by fast head-tail instability due to wake force induced by electron cloud. The emittance growth was suppressed by weak permanent magnets generating longitudinal field, which cover the drift space of the ring in Phase-II (2018). The emittance growth has been studied during the commissioning with measuring electron cloud density in the beam chamber. We discuss threshold of the electron density for the instability.
id oai-inspirehep.net-1820071
institution Organización Europea para la Investigación Nuclear
language eng
publishDate 2020
record_format invenio
spelling oai-inspirehep.net-18200712020-12-11T22:26:21Zdoi:10.23732/CYRCP-2020-007.179http://cds.cern.ch/record/2737329engOhmi, KFlanagan, JFukuma, HIkeda, HMulyani, EShibata, KSuetsugu, YTobiyama, MElectron cloud effects in SuperKEKB commissioningAccelerators and Storage RingsA vertical emittance growth (beam size blow-up) due to electron cloud has been observed in the positron low energy ring (LER) in Phase-I commissioning (2016) of SuperKEKB. The emittance growth is caused by fast head-tail instability due to wake force induced by electron cloud. The emittance growth was suppressed by weak permanent magnets generating longitudinal field, which cover the drift space of the ring in Phase-II (2018). The emittance growth has been studied during the commissioning with measuring electron cloud density in the beam chamber. We discuss threshold of the electron density for the instability.oai:inspirehep.net:18200712020
spellingShingle Accelerators and Storage Rings
Ohmi, K
Flanagan, J
Fukuma, H
Ikeda, H
Mulyani, E
Shibata, K
Suetsugu, Y
Tobiyama, M
Electron cloud effects in SuperKEKB commissioning
title Electron cloud effects in SuperKEKB commissioning
title_full Electron cloud effects in SuperKEKB commissioning
title_fullStr Electron cloud effects in SuperKEKB commissioning
title_full_unstemmed Electron cloud effects in SuperKEKB commissioning
title_short Electron cloud effects in SuperKEKB commissioning
title_sort electron cloud effects in superkekb commissioning
topic Accelerators and Storage Rings
url https://dx.doi.org/10.23732/CYRCP-2020-007.179
http://cds.cern.ch/record/2737329
work_keys_str_mv AT ohmik electroncloudeffectsinsuperkekbcommissioning
AT flanaganj electroncloudeffectsinsuperkekbcommissioning
AT fukumah electroncloudeffectsinsuperkekbcommissioning
AT ikedah electroncloudeffectsinsuperkekbcommissioning
AT mulyanie electroncloudeffectsinsuperkekbcommissioning
AT shibatak electroncloudeffectsinsuperkekbcommissioning
AT suetsuguy electroncloudeffectsinsuperkekbcommissioning
AT tobiyamam electroncloudeffectsinsuperkekbcommissioning

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