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Self-consistent calculation of transient beam loading in electron storage rings with passive harmonic cavities

Olsson, T. LU ; Cullinan, F. J. LU and Andersson, A. LU (2018) In Physical Review Accelerators and Beams 21(12).
Abstract

The ongoing trend towards synchrotron light storage rings with ultralow emittance lattices leads to greater challenges to achieve beam stability, sufficient Touschek lifetime, low heating of machine components, and conservation of the emittance at high bunch charge. One solution to meet these challenges is to lengthen the electron bunches with harmonic cavities. Many upgrade proposals therefore include harmonic cavities to enhance the machine performance. This is also the case for the MAX IV 3 GeV storage ring, which employs passive third harmonic cavities to achieve up to five times bunch lengthening. Unfortunately, the performance of the harmonic cavities is reduced if a gap in the fill pattern is required. In this paper, the effect... (More)

The ongoing trend towards synchrotron light storage rings with ultralow emittance lattices leads to greater challenges to achieve beam stability, sufficient Touschek lifetime, low heating of machine components, and conservation of the emittance at high bunch charge. One solution to meet these challenges is to lengthen the electron bunches with harmonic cavities. Many upgrade proposals therefore include harmonic cavities to enhance the machine performance. This is also the case for the MAX IV 3 GeV storage ring, which employs passive third harmonic cavities to achieve up to five times bunch lengthening. Unfortunately, the performance of the harmonic cavities is reduced if a gap in the fill pattern is required. In this paper, the effect on synchronous phase and bunch length due to a gap in the fill pattern for rings with passive harmonic cavities is calculated in a self-consistent way including the bunch form factor. The aim is to achieve faster simulation of various schemes for compensating a gap compared to multiparticle tracking. A new semianalytical method based on an iterative matrix formulation is presented, as well as a single-particle tracking code including the bunch form factor. The results from these methods are compared to both results from a multiparticle tracking code and measurements at the MAX IV 3 GeV storage ring. The importance of including the bunch form factor in simulations is evaluated and discussed.

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author
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organization
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type
Contribution to journal
publication status
published
subject
in
Physical Review Accelerators and Beams
volume
21
issue
12
article number
120701
publisher
American Physical Society
external identifiers
  • scopus:85057745078
ISSN
2469-9888
DOI
10.1103/PhysRevAccelBeams.21.120701
language
English
LU publication?
yes
id
2766d123-e8a3-41fc-bff0-302d3c5c7d7f
date added to LUP
2018-12-18 14:27:40
date last changed
2022-03-17 20:01:09
@article{2766d123-e8a3-41fc-bff0-302d3c5c7d7f,
  abstract     = {{<p>The ongoing trend towards synchrotron light storage rings with ultralow emittance lattices leads to greater challenges to achieve beam stability, sufficient Touschek lifetime, low heating of machine components, and conservation of the emittance at high bunch charge. One solution to meet these challenges is to lengthen the electron bunches with harmonic cavities. Many upgrade proposals therefore include harmonic cavities to enhance the machine performance. This is also the case for the MAX IV 3 GeV storage ring, which employs passive third harmonic cavities to achieve up to five times bunch lengthening. Unfortunately, the performance of the harmonic cavities is reduced if a gap in the fill pattern is required. In this paper, the effect on synchronous phase and bunch length due to a gap in the fill pattern for rings with passive harmonic cavities is calculated in a self-consistent way including the bunch form factor. The aim is to achieve faster simulation of various schemes for compensating a gap compared to multiparticle tracking. A new semianalytical method based on an iterative matrix formulation is presented, as well as a single-particle tracking code including the bunch form factor. The results from these methods are compared to both results from a multiparticle tracking code and measurements at the MAX IV 3 GeV storage ring. The importance of including the bunch form factor in simulations is evaluated and discussed.</p>}},
  author       = {{Olsson, T. and Cullinan, F. J. and Andersson, A.}},
  issn         = {{2469-9888}},
  language     = {{eng}},
  number       = {{12}},
  publisher    = {{American Physical Society}},
  series       = {{Physical Review Accelerators and Beams}},
  title        = {{Self-consistent calculation of transient beam loading in electron storage rings with passive harmonic cavities}},
  url          = {{http://dx.doi.org/10.1103/PhysRevAccelBeams.21.120701}},
  doi          = {{10.1103/PhysRevAccelBeams.21.120701}},
  volume       = {{21}},
  year         = {{2018}},
}