Title |
A Method for Determining the Roll Angle of the CLIC Accelerating Structures From the Beam Shape Downstream of the Structure |
Authors |
- J. Ögren, V.G. Ziemann
Uppsala University, Uppsala, Sweden
- W. Farabolini
CEA/DSM/IRFU, France
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Abstract |
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.
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Paper |
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Conference |
IPAC2017, Copenhagen, Denmark |
Series |
International Particle Accelerator Conference (8th) |
Proceedings |
Link to full IPAC2017 Proccedings |
Session |
Posters Monday 1 |
Date |
15-May-17 16:00–18:00 |
Main Classification |
06 Beam Instrumentation, Controls, Feedback and Operational Aspects |
Sub Classification |
T03 Beam Diagnostics and Instrumentation |
Keywords |
octupole, collider, simulation, experiment, emittance |
Publisher |
JACoW, Geneva, Switzerland |
Editors |
Volker RW Schaa (GSI, Darmstadt, Germany); Gianluigi Arduini (CERN, Geneva, Switzerland); Juliana Pranke (ESS, Lund, Sweden); Mike Seidel (PSI, Villigen, Switzerland); Mats Lindroos (ESS, Lund, Sweden) |
ISBN |
978-3-95450-182-3 |
Published |
May 2017 |
Copyright |
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