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Asymmetric influence of the amplitude-dependent tune shift on the transverse mode-coupling instability

Brosi, Miriam LU orcid ; Cullinan, Francis LU ; Andersson, Åke LU ; Breunlin, Jonas LU and Tavares, Pedro Fernandes LU (2024) In Physical Review Accelerators and Beams 27(10).
Abstract

At the 3 GeV ring of the MAX IV Laboratory, a fourth-generation ring-based synchrotron light source, an asymmetric influence of the sign of the amplitude-dependent tune shift (ADTS) on the transverse mode-coupling instability has been observed. Measurements of the instability, in dedicated single-bunch experiments at low chromaticity, revealed a significant dependence of the dynamics of the instability above threshold on the sign of the ADTS. While for a negative sign of the ADTS, the crossing of the instability does not lead to a loss of beam current, a positive sign results in the loss of 40% or more of the beam current at the threshold. In order to investigate the observed asymmetry, the systematic measurement of beam dynamics above... (More)

At the 3 GeV ring of the MAX IV Laboratory, a fourth-generation ring-based synchrotron light source, an asymmetric influence of the sign of the amplitude-dependent tune shift (ADTS) on the transverse mode-coupling instability has been observed. Measurements of the instability, in dedicated single-bunch experiments at low chromaticity, revealed a significant dependence of the dynamics of the instability above threshold on the sign of the ADTS. While for a negative sign of the ADTS, the crossing of the instability does not lead to a loss of beam current, a positive sign results in the loss of 40% or more of the beam current at the threshold. In order to investigate the observed asymmetry, the systematic measurement of beam dynamics above the threshold has been conducted in combination with particle tracking simulations with mbtrack2 and theoretical calculations of the Landau damping due to the ADTS. The findings point toward an influence of the Landau damping in combination with the low synchrotron frequency, which indicates that this effect could become relevant in the future low-emittance electron storage rings.

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author
; ; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Physical Review Accelerators and Beams
volume
27
issue
10
article number
104402
pages
16 pages
publisher
American Physical Society
external identifiers
  • scopus:85208364316
ISSN
2469-9888
DOI
10.1103/PhysRevAccelBeams.27.104402
language
English
LU publication?
yes
additional info
Publisher Copyright: © 2024 authors. Published by the American Physical Society. Published by the American Physical Society under the terms of the "https://creativecommons.org/licenses/by/4.0/"Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.
id
36092eed-b039-4ce6-b97c-c610d23a3160
date added to LUP
2024-11-26 09:57:29
date last changed
2025-04-04 15:09:35
@article{36092eed-b039-4ce6-b97c-c610d23a3160,
  abstract     = {{<p>At the 3 GeV ring of the MAX IV Laboratory, a fourth-generation ring-based synchrotron light source, an asymmetric influence of the sign of the amplitude-dependent tune shift (ADTS) on the transverse mode-coupling instability has been observed. Measurements of the instability, in dedicated single-bunch experiments at low chromaticity, revealed a significant dependence of the dynamics of the instability above threshold on the sign of the ADTS. While for a negative sign of the ADTS, the crossing of the instability does not lead to a loss of beam current, a positive sign results in the loss of 40% or more of the beam current at the threshold. In order to investigate the observed asymmetry, the systematic measurement of beam dynamics above the threshold has been conducted in combination with particle tracking simulations with mbtrack2 and theoretical calculations of the Landau damping due to the ADTS. The findings point toward an influence of the Landau damping in combination with the low synchrotron frequency, which indicates that this effect could become relevant in the future low-emittance electron storage rings.</p>}},
  author       = {{Brosi, Miriam and Cullinan, Francis and Andersson, Åke and Breunlin, Jonas and Tavares, Pedro Fernandes}},
  issn         = {{2469-9888}},
  language     = {{eng}},
  number       = {{10}},
  publisher    = {{American Physical Society}},
  series       = {{Physical Review Accelerators and Beams}},
  title        = {{Asymmetric influence of the amplitude-dependent tune shift on the transverse mode-coupling instability}},
  url          = {{http://dx.doi.org/10.1103/PhysRevAccelBeams.27.104402}},
  doi          = {{10.1103/PhysRevAccelBeams.27.104402}},
  volume       = {{27}},
  year         = {{2024}},
}