Home > Research > Publications & Outputs > Filling Pattern Dependence of Regenerative Beam...

Associated organisational unit

Electronic data

  • ZD10185_2ndSub_Final

    Accepted author manuscript, 950 KB, PDF document

    Available under license: CC BY: Creative Commons Attribution 4.0 International License


Text available via DOI:

View graph of relations

Filling Pattern Dependence of Regenerative Beam Breakup Instability in Energy Recovery Linacs

Research output: Contribution to Journal/MagazineJournal articlepeer-review

Article number061003
<mark>Journal publication date</mark>23/06/2021
<mark>Journal</mark>Physical Review Accelerators and Beams
Issue number6
Number of pages10
Pages (from-to)1-10
Publication StatusPublished
<mark>Original language</mark>English


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 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 multi-pass 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 optimise the design in order to minimise 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 factors 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 BBU, expanding the utility of future ERLs.