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Filling pattern dependence of regenerative beam breakup instability in energy recovery linacs

S. Setiniyaz* and R. Apsimon†

P. H. Williams‡

  • Engineering Department, Lancaster University, Lancaster, LA1 4YW, United Kingdom and Cockcroft Institute, Daresbury Laboratory, Warrington, WA4 4AD, United Kingdom

  • STFC Daresbury Laboratory & Cockcroft Institute, Warrington, WA4 4AD, United Kingdom

  • *s.saitiniyazi@lancaster.ac.uk
  • †r.apsimon@lancaster.ac.uk
  • ‡peter.williams@stfc.ac.uk
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Phys. Rev. Accel. Beams 24, 061003 – Published 23 June, 2021

DOI: https://doi.org/10.1103/PhysRevAccelBeams.24.061003

Abstract

Beam breakup instability is a potential issue for all particle accelerators and is often the limiting factor for the maximum beam current that can be achieved. This is particularly relevant for energy recovery linacs (ERLs)with multiple passes where a relatively small amount of charge can result in a large beam current. Recent studies have shown that the choice of filling pattern and recirculation scheme for a multipass energy recovery linac can drastically affect the interactions between the beam and rf system. In this paper, we further explore this topic to study how filling patterns affect the beam breakup instability and how this can allow us to optimize the design in order to minimize this effect. We present a theoretical model of the beam-rf interaction as well as numerical modeling and show that the threshold current can vary by a factor of 5, and potentially, even more, depending on the machine design parameters. Therefore a judicious choice of filling pattern can greatly increase the onset of beam breakup, expanding the utility of future ERLs.

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Phys. Rev. Accel. Beams 24, 061003– Published 23 June, 2021
  • Received 27 April 2021
  • Accepted 14 June 2021
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