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A Method for Determining the Roll Angle of the CLIC Accelerating Structures From the Beam Shape Downstream of the Structure

The Compact Linear Collider (CLIC) accelerating structures have a four-fold symmetry from the radial waveguides for damping higher order modes. This symmetry allows for an octupole component of the rf fields to co-propagate with the main accelerating field. The effect of this octupole mode has been...

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Detalles Bibliográficos
Autores principales: Ögren, Jim, Farabolini, Wilfrid, Ziemann, Volker
Lenguaje:eng
Publicado: 2017
Materias:
Acceso en línea:https://dx.doi.org/10.18429/JACoW-IPAC2017-MOPAB107
http://cds.cern.ch/record/2674351
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author Ögren, Jim
Farabolini, Wilfrid
Ziemann, Volker
author_facet Ögren, Jim
Farabolini, Wilfrid
Ziemann, Volker
author_sort Ögren, Jim
collection CERN
description The Compact Linear Collider (CLIC) accelerating structures have a four-fold symmetry from the radial waveguides for damping higher order modes. This symmetry allows for an octupole component of the rf fields to co-propagate with the main accelerating field. The effect of this octupole mode has been observed at the CLIC test facility 3. In CLIC the accelerating structures are mounted together on a moveable girders. There are four vertical and four horizontal actuators on the girder, which allows for 5D control in a limited range and for instance we can roll the girder. By observing the beam shape perturbed by the octupole field on a screen downstream from the structure we can determine the roll angle and thus align the structure azimuthally. Here we discuss a possible method and show some preliminary results.
id oai-inspirehep.net-1707394
institution Organización Europea para la Investigación Nuclear
language eng
publishDate 2017
record_format invenio
spelling oai-inspirehep.net-17073942019-09-30T06:29:59Zdoi:10.18429/JACoW-IPAC2017-MOPAB107http://cds.cern.ch/record/2674351engÖgren, JimFarabolini, WilfridZiemann, VolkerA Method for Determining the Roll Angle of the CLIC Accelerating Structures From the Beam Shape Downstream of the StructureAccelerators and Storage RingsThe Compact Linear Collider (CLIC) accelerating structures have a four-fold symmetry from the radial waveguides for damping higher order modes. This symmetry allows for an octupole component of the rf fields to co-propagate with the main accelerating field. The effect of this octupole mode has been observed at the CLIC test facility 3. In CLIC the accelerating structures are mounted together on a moveable girders. There are four vertical and four horizontal actuators on the girder, which allows for 5D control in a limited range and for instance we can roll the girder. By observing the beam shape perturbed by the octupole field on a screen downstream from the structure we can determine the roll angle and thus align the structure azimuthally. Here we discuss a possible method and show some preliminary results.oai:inspirehep.net:17073942017
spellingShingle Accelerators and Storage Rings
Ögren, Jim
Farabolini, Wilfrid
Ziemann, Volker
A Method for Determining the Roll Angle of the CLIC Accelerating Structures From the Beam Shape Downstream of the Structure
title A Method for Determining the Roll Angle of the CLIC Accelerating Structures From the Beam Shape Downstream of the Structure
title_full A Method for Determining the Roll Angle of the CLIC Accelerating Structures From the Beam Shape Downstream of the Structure
title_fullStr A Method for Determining the Roll Angle of the CLIC Accelerating Structures From the Beam Shape Downstream of the Structure
title_full_unstemmed A Method for Determining the Roll Angle of the CLIC Accelerating Structures From the Beam Shape Downstream of the Structure
title_short A Method for Determining the Roll Angle of the CLIC Accelerating Structures From the Beam Shape Downstream of the Structure
title_sort method for determining the roll angle of the clic accelerating structures from the beam shape downstream of the structure
topic Accelerators and Storage Rings
url https://dx.doi.org/10.18429/JACoW-IPAC2017-MOPAB107
http://cds.cern.ch/record/2674351
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