Amplitude Dependent Closest Tune Approach Generated by Normal and Skew Octupoles

Amplitude dependent closest tune approach, an action dependent analogue of the $|Delta Q_{min}$ generated by linear coupling, was observed in the LHC in 2012. It restricts the accessible resonance free area of the tune diagram and by altering tune spread has the potential to impact upon Landau dampi...

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Detalles Bibliográficos
Autores principales: Maclean, Ewen, Persson, Tobias, Tomás, Rogelio
Lenguaje:eng
Publicado: 2017
Materias:
Accelerators and Storage Rings
Acceso en línea:https://dx.doi.org/10.18429/JACoW-IPAC2017-WEPIK091
http://cds.cern.ch/record/2673788
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author Maclean, Ewen
Persson, Tobias
Tomás, Rogelio
author_facet Maclean, Ewen
Persson, Tobias
Tomás, Rogelio
author_sort Maclean, Ewen
collection CERN
description Amplitude dependent closest tune approach, an action dependent analogue of the $|Delta Q_{min}$ generated by linear coupling, was observed in the LHC in 2012. It restricts the accessible resonance free area of the tune diagram and by altering tune spread has the potential to impact upon Landau damping. A theoretical description of such behaviour, generated by normal octupoles and linear coupling was recently validated in the LHC. Simulation has also established that amplitude-dependent closest approach can be generated by a combination of normal and skew octupoles. This paper summarizes these simulation based observations.
id oai-inspirehep.net-1707396
institution Organización Europea para la Investigación Nuclear
language eng
publishDate 2017
record_format invenio
spelling oai-inspirehep.net-17073962019-11-13T11:53:14Zdoi:10.18429/JACoW-IPAC2017-WEPIK091http://cds.cern.ch/record/2673788engMaclean, EwenPersson, TobiasTomás, RogelioAmplitude Dependent Closest Tune Approach Generated by Normal and Skew OctupolesAccelerators and Storage RingsAmplitude dependent closest tune approach, an action dependent analogue of the $|Delta Q_{min}$ generated by linear coupling, was observed in the LHC in 2012. It restricts the accessible resonance free area of the tune diagram and by altering tune spread has the potential to impact upon Landau damping. A theoretical description of such behaviour, generated by normal octupoles and linear coupling was recently validated in the LHC. Simulation has also established that amplitude-dependent closest approach can be generated by a combination of normal and skew octupoles. This paper summarizes these simulation based observations.CERN-ACC-2017-337oai:inspirehep.net:17073962017
spellingShingle Accelerators and Storage Rings
Maclean, Ewen
Persson, Tobias
Tomás, Rogelio
Amplitude Dependent Closest Tune Approach Generated by Normal and Skew Octupoles
title Amplitude Dependent Closest Tune Approach Generated by Normal and Skew Octupoles
title_full Amplitude Dependent Closest Tune Approach Generated by Normal and Skew Octupoles
title_fullStr Amplitude Dependent Closest Tune Approach Generated by Normal and Skew Octupoles
title_full_unstemmed Amplitude Dependent Closest Tune Approach Generated by Normal and Skew Octupoles
title_short Amplitude Dependent Closest Tune Approach Generated by Normal and Skew Octupoles
title_sort amplitude dependent closest tune approach generated by normal and skew octupoles
topic Accelerators and Storage Rings
url https://dx.doi.org/10.18429/JACoW-IPAC2017-WEPIK091
http://cds.cern.ch/record/2673788
work_keys_str_mv AT macleanewen amplitudedependentclosesttuneapproachgeneratedbynormalandskewoctupoles
AT perssontobias amplitudedependentclosesttuneapproachgeneratedbynormalandskewoctupoles
AT tomasrogelio amplitudedependentclosesttuneapproachgeneratedbynormalandskewoctupoles

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