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Experimental observation of a mode-1 instability driven by Landau cavities in a storage ring

Cullinan, F. J. LU ; Andersson LU ; Breunlin, J. LU ; Brosi, M. LU orcid and Tavares, P. F. LU (2024) In Physical Review Accelerators and Beams 27(4).
Abstract

Landau cavities used to lengthen the bunches in storage rings necessarily constitute a significant impedance. Because of the particular phase of the field required for bunch lengthening, they are often detuned quite considerably from resonance, more so than the main cavities. As a result, their impedance can excite the first coupled-bunch mode such that it becomes unstable. This phenomenon has previously been predicted [M. Venturini, Phys. Rev. Accel. Beams 21, 114404 (2018)PRABCJ2469-988810.1103/PhysRevAccelBeams.21.114404] and characterized in simulations [T. He, Phys. Rev. Accel. Beams 25, 024401 (2022)PRABCJ2469-988810.1103/PhysRevAccelBeams.25.024401] but experimental observation is yet to be documented. In this paper, the... (More)

Landau cavities used to lengthen the bunches in storage rings necessarily constitute a significant impedance. Because of the particular phase of the field required for bunch lengthening, they are often detuned quite considerably from resonance, more so than the main cavities. As a result, their impedance can excite the first coupled-bunch mode such that it becomes unstable. This phenomenon has previously been predicted [M. Venturini, Phys. Rev. Accel. Beams 21, 114404 (2018)PRABCJ2469-988810.1103/PhysRevAccelBeams.21.114404] and characterized in simulations [T. He, Phys. Rev. Accel. Beams 25, 024401 (2022)PRABCJ2469-988810.1103/PhysRevAccelBeams.25.024401] but experimental observation is yet to be documented. In this paper, the experimental observation of coupled-bunch modes-±1 excited by the Landau and main cavities in a fourth-generation light-source storage ring is presented. Features of the instability such as amplitude and coherent frequency at saturation have been measured and its dependency on the main rf voltage has been explored. The impact of a parked main cavity has also been investigated.

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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
4
article number
044403
publisher
American Physical Society
external identifiers
  • scopus:85190417566
ISSN
2469-9888
DOI
10.1103/PhysRevAccelBeams.27.044403
language
English
LU publication?
yes
id
d0f6b378-7344-4809-8c40-27d2f1c6e73b
date added to LUP
2024-05-02 15:44:14
date last changed
2024-05-02 15:45:36
@article{d0f6b378-7344-4809-8c40-27d2f1c6e73b,
  abstract     = {{<p>Landau cavities used to lengthen the bunches in storage rings necessarily constitute a significant impedance. Because of the particular phase of the field required for bunch lengthening, they are often detuned quite considerably from resonance, more so than the main cavities. As a result, their impedance can excite the first coupled-bunch mode such that it becomes unstable. This phenomenon has previously been predicted [M. Venturini, Phys. Rev. Accel. Beams 21, 114404 (2018)PRABCJ2469-988810.1103/PhysRevAccelBeams.21.114404] and characterized in simulations [T. He, Phys. Rev. Accel. Beams 25, 024401 (2022)PRABCJ2469-988810.1103/PhysRevAccelBeams.25.024401] but experimental observation is yet to be documented. In this paper, the experimental observation of coupled-bunch modes-±1 excited by the Landau and main cavities in a fourth-generation light-source storage ring is presented. Features of the instability such as amplitude and coherent frequency at saturation have been measured and its dependency on the main rf voltage has been explored. The impact of a parked main cavity has also been investigated.</p>}},
  author       = {{Cullinan, F. J. and Andersson and Breunlin, J. and Brosi, M. and Tavares, P. F.}},
  issn         = {{2469-9888}},
  language     = {{eng}},
  number       = {{4}},
  publisher    = {{American Physical Society}},
  series       = {{Physical Review Accelerators and Beams}},
  title        = {{Experimental observation of a mode-1 instability driven by Landau cavities in a storage ring}},
  url          = {{http://dx.doi.org/10.1103/PhysRevAccelBeams.27.044403}},
  doi          = {{10.1103/PhysRevAccelBeams.27.044403}},
  volume       = {{27}},
  year         = {{2024}},
}