Beams Document 6276-v1

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How to decouple a thin sextupole?

Document #:
Beams-doc-6276-v1
Document type:
Note
Submitted by:
Sergei Nagaitsev
Updated by:
Sergei Nagaitsev
Document Created:
23 Apr 2018, 10:22
Contents Revised:
23 Apr 2018, 10:22
DB Info Revised:
23 Apr 2018, 10:22
Viewable by:
  • Public document
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Abstract:
Sextupole magnets always introduce a nonlinear coupling effect on particle motion. Although sextupole focusing can be quite useful in rings (e.g. for dispersion suppression), the coupling effects are usually harmful, because they lead to nonlinear coupling resonances. In this paper we present a method of creating an uncoupled thin composite sextupole
element. The method employs thin sextupoles as nonlinear elements as well as linear focusing elements (such as
quadrupoles or dipoles). The method serves as a proof of concept that with proper choice of linear optics some of
the harmful nonlinear effect can be reduced or eliminated.
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Keywords:
sextupole beamline
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