Using ac dipoles to localize sources of beam coupling impedance
The beam coupling impedance is one of the main sources of beam instabilities and emittance blow up in circular accelerators. A refined machine impedance evaluation is therefore required in order to understand and model intensity dependent effects and instabilities that may limit the machine performa...
Main Authors: | , |
---|---|
Format: | Article |
Language: | English |
Published: |
American Physical Society
2016-05-01
|
Series: | Physical Review Accelerators and Beams |
Online Access: | http://doi.org/10.1103/PhysRevAccelBeams.19.054001 |
id |
doaj-3285a1ca765c4ee295166261d7e0e6a1 |
---|---|
record_format |
Article |
spelling |
doaj-3285a1ca765c4ee295166261d7e0e6a12020-11-24T21:24:20ZengAmerican Physical SocietyPhysical Review Accelerators and Beams2469-98882016-05-0119505400110.1103/PhysRevAccelBeams.19.054001Using ac dipoles to localize sources of beam coupling impedanceN. BiancacciR. TomásThe beam coupling impedance is one of the main sources of beam instabilities and emittance blow up in circular accelerators. A refined machine impedance evaluation is therefore required in order to understand and model intensity dependent effects and instabilities that may limit the machine performance. For this reason, many impedance source localization techniques have been developed. In this work we present the impedance localization technique based on the observation of phase advance versus intensity at the beam position monitors using ac dipoles to force betatron oscillations. We present analytical formulas for the interpretation of measurements together with simulations to benchmark and illustrate the equations. Studies on the method accuracy for different Fourier transform algorithms are presented as well as first exploratory measurements performed in the LHC.http://doi.org/10.1103/PhysRevAccelBeams.19.054001 |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
N. Biancacci R. Tomás |
spellingShingle |
N. Biancacci R. Tomás Using ac dipoles to localize sources of beam coupling impedance Physical Review Accelerators and Beams |
author_facet |
N. Biancacci R. Tomás |
author_sort |
N. Biancacci |
title |
Using ac dipoles to localize sources of beam coupling impedance |
title_short |
Using ac dipoles to localize sources of beam coupling impedance |
title_full |
Using ac dipoles to localize sources of beam coupling impedance |
title_fullStr |
Using ac dipoles to localize sources of beam coupling impedance |
title_full_unstemmed |
Using ac dipoles to localize sources of beam coupling impedance |
title_sort |
using ac dipoles to localize sources of beam coupling impedance |
publisher |
American Physical Society |
series |
Physical Review Accelerators and Beams |
issn |
2469-9888 |
publishDate |
2016-05-01 |
description |
The beam coupling impedance is one of the main sources of beam instabilities and emittance blow up in circular accelerators. A refined machine impedance evaluation is therefore required in order to understand and model intensity dependent effects and instabilities that may limit the machine performance. For this reason, many impedance source localization techniques have been developed. In this work we present the impedance localization technique based on the observation of phase advance versus intensity at the beam position monitors using ac dipoles to force betatron oscillations. We present analytical formulas for the interpretation of measurements together with simulations to benchmark and illustrate the equations. Studies on the method accuracy for different Fourier transform algorithms are presented as well as first exploratory measurements performed in the LHC. |
url |
http://doi.org/10.1103/PhysRevAccelBeams.19.054001 |
work_keys_str_mv |
AT nbiancacci usingacdipolestolocalizesourcesofbeamcouplingimpedance AT rtomas usingacdipolestolocalizesourcesofbeamcouplingimpedance |
_version_ |
1725988935362936832 |