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RF multipole implementation

The electromagnetic radio-frequency (RF) field of accelerating structures and crab-cavities can exhibit transverse field components due to asymmetries in the azimuthal direction of the element geometry. Tracking simulations must be performed to evaluate the impact of such transverse RF deflections o...

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Detalles Bibliográficos
Autores principales: Latina, A, De Maria, R
Lenguaje:eng
Publicado: 2012
Materias:
Acceso en línea:http://cds.cern.ch/record/1491234
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author Latina, A
De Maria, R
author_facet Latina, A
De Maria, R
author_sort Latina, A
collection CERN
description The electromagnetic radio-frequency (RF) field of accelerating structures and crab-cavities can exhibit transverse field components due to asymmetries in the azimuthal direction of the element geometry. Tracking simulations must be performed to evaluate the impact of such transverse RF deflections on the beam dynamics. In an ultra-relativistic regime where the Panofsky-Wenzel theorem is applicable, these RF deflections can be modeled via a multipolar expansion of the generating RF field similarly to what is done with static magnetic elements. The element implementing such RF multipolar fields has been called RF multipole. In this note we present an analytical formulation of a thin RF multipole Hamiltonian, and we explicitly calculate the RF kick and the elements of its first- and second- order transfer matrices. Also, we present the implementation of the corresponding code in MAD-X, plus some tests of tracking, simplecticity, consistency, and reflected maps that we successfully applied to verify the correctness of our computations.
id cern-1491234
institution Organización Europea para la Investigación Nuclear
language eng
publishDate 2012
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spelling cern-14912342022-05-25T15:08:48Zhttp://cds.cern.ch/record/1491234engLatina, ADe Maria, RRF multipole implementationAccelerators and Storage RingsThe electromagnetic radio-frequency (RF) field of accelerating structures and crab-cavities can exhibit transverse field components due to asymmetries in the azimuthal direction of the element geometry. Tracking simulations must be performed to evaluate the impact of such transverse RF deflections on the beam dynamics. In an ultra-relativistic regime where the Panofsky-Wenzel theorem is applicable, these RF deflections can be modeled via a multipolar expansion of the generating RF field similarly to what is done with static magnetic elements. The element implementing such RF multipolar fields has been called RF multipole. In this note we present an analytical formulation of a thin RF multipole Hamiltonian, and we explicitly calculate the RF kick and the elements of its first- and second- order transfer matrices. Also, we present the implementation of the corresponding code in MAD-X, plus some tests of tracking, simplecticity, consistency, and reflected maps that we successfully applied to verify the correctness of our computations.CERN-ATS-Note-2012-088 TECHoai:cds.cern.ch:14912342012-11-01
spellingShingle Accelerators and Storage Rings
Latina, A
De Maria, R
RF multipole implementation
title RF multipole implementation
title_full RF multipole implementation
title_fullStr RF multipole implementation
title_full_unstemmed RF multipole implementation
title_short RF multipole implementation
title_sort rf multipole implementation
topic Accelerators and Storage Rings
url http://cds.cern.ch/record/1491234
work_keys_str_mv AT latinaa rfmultipoleimplementation
AT demariar rfmultipoleimplementation