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Title: Parametrizations of coupled betatron motion for strongly coupled lattices

Journal Article · · Journal of Instrumentation
 [1];  [2];  [3];  [4];  [1]
  1. Free University of Brussels (Belgium)
  2. Free University of Brussels (Belgium); European Organization for Nuclear Research (CERN), Meyrin (Switzerland)
  3. Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
  4. Harwell Science and Innovation Campus, Didcot (United Kingdom). STFC Rutherford Appleton Laboratory
+ Show Author Affiliations

The coupling of transverse motion is a natural occurrence in particle accelerators, either in the form of a residual coupling arising from imperfections or originating by design from strong systematic coupling fields. While the first can be treated perturbatively, the latter requires a robust approach adapted to strongly coupled optics, and a parametrization of the linear optics must be performed to explore beam dynamics in such peculiar lattices. This work highlights the key physical interpretations of the main parametrization formalisms to describe linear coupled optics, along with explicit links and comparisons of these parametrizations. Concepts rarely illustrated in other works, such as forced mode flips and local coupling, are explored in detail, clarifying some anomalies that can arise in lattice functions. The analytical methods have been implemented in a reference Python package and connected with ray-tracing and integration codes to explore examples of strongly coupled lattices, which are discussed in detail to highlight the key physical interpretations of the parametrizations and characteristics of the lattices.

Research Organization:
Thomas Jefferson National Accelerator Facility, Newport News, VA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Nuclear Physics (NP)
Grant/Contract Number:
AC05-06OR23177
OSTI ID:
2204029
Report Number(s):
JLAB-ACP--22-3770; DOE/OR/23177--5676
Journal Information:
Journal of Instrumentation, Journal Name: Journal of Instrumentation Journal Issue: 10 Vol. 18; ISSN 1748-0221
Publisher:
Institute of Physics (IOP)Copyright Statement
Country of Publication:
United States
Language:
English

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