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Algorithms to get a circulating beam

Two algorithms based of trajectory fitting have been used to obtain rapidly a circulating beam in LEP with strong focusing lattices. A new algorithm called "orbit closure" uses the beam positions measured at the first and the second turn. From their difference, it computes two corrector st...

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Detalles Bibliográficos
Autores principales: Verdier, A, Richard, F
Lenguaje:eng
Publicado: 1995
Materias:
Acceso en línea:http://cds.cern.ch/record/282847
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author Verdier, A
Richard, F
author_facet Verdier, A
Richard, F
author_sort Verdier, A
collection CERN
description Two algorithms based of trajectory fitting have been used to obtain rapidly a circulating beam in LEP with strong focusing lattices. A new algorithm called "orbit closure" uses the beam positions measured at the first and the second turn. From their difference, it computes two corrector strengths per plane such that the second turn passes at the same place as the first turn at about ten BPM locations. This produces a closed orbit amplitude with an r.m.s. value close to that of the first turn trajectory. A new 'first turn threader' has been tried. It detects places where an oscillation with an r.m.s. amplitude larger than a specified value starts, and computes two corrector strengths to cancel it. By iterating this process, it should be possible to correct by steps the first turn trajectory so that its r.m.s amplitude is below a specified value. The orbit closure has been applied with success to a very low emittance lattice (135o in the horizontal plane) in LEP.
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institution Organización Europea para la Investigación Nuclear
language eng
publishDate 1995
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spelling cern-2828472023-05-05T12:57:17Zhttp://cds.cern.ch/record/282847engVerdier, ARichard, FAlgorithms to get a circulating beamAccelerators and Storage RingsTwo algorithms based of trajectory fitting have been used to obtain rapidly a circulating beam in LEP with strong focusing lattices. A new algorithm called "orbit closure" uses the beam positions measured at the first and the second turn. From their difference, it computes two corrector strengths per plane such that the second turn passes at the same place as the first turn at about ten BPM locations. This produces a closed orbit amplitude with an r.m.s. value close to that of the first turn trajectory. A new 'first turn threader' has been tried. It detects places where an oscillation with an r.m.s. amplitude larger than a specified value starts, and computes two corrector strengths to cancel it. By iterating this process, it should be possible to correct by steps the first turn trajectory so that its r.m.s amplitude is below a specified value. The orbit closure has been applied with success to a very low emittance lattice (135o in the horizontal plane) in LEP.CERN-SL-95-44-APoai:cds.cern.ch:2828471995-06-02
spellingShingle Accelerators and Storage Rings
Verdier, A
Richard, F
Algorithms to get a circulating beam
title Algorithms to get a circulating beam
title_full Algorithms to get a circulating beam
title_fullStr Algorithms to get a circulating beam
title_full_unstemmed Algorithms to get a circulating beam
title_short Algorithms to get a circulating beam
title_sort algorithms to get a circulating beam
topic Accelerators and Storage Rings
url http://cds.cern.ch/record/282847
work_keys_str_mv AT verdiera algorithmstogetacirculatingbeam
AT richardf algorithmstogetacirculatingbeam