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Full Record Details
Persistent URL
http://purl.org/net/epubs/work/50458997
Record Status
Checked
Record Id
50458997
Title
Simulation of the Filling Pattern Dependent Regenerative Beam Breakup Instabilities in Energy Recovery Linacs
Contributors
S Setiniyaz
,
R Apsimon (Cockcroft Inst., and Lancaster Univ.)
,
P Williams (STFC Daresbury Lab., and Cockcroft Inst.)
Abstract
The interaction of a transversely displaced beam with the higher modes (HOM) of the accelerating cavities causes building up HOM voltages in the cavity, which in turn kicks the beam and increases the offset further. This is known as regenerative beam breakup (BBU) instability and it sets the beam threshold current for the stable beam operation. A study by Setiniyaz et al. [Setiniyaz2020] showed the filling pattern and recombination schemes of multi-turn energy recovery linacs (ERLs) can create many different beam loading transients, which can have a big impact on the cavity fundamental mode voltage and RF stabilizes. In this work, we extend the study of the filling pattern and recombination schemes to the BBU instabilities and threshold current. In the ERLs, the accelerated and decelerated bunches can be ordered differently while they pass through the cavity and form different filling patterns. Each pattern has a unique bunch energy sequence and bunch arrival times and hence interacts with cavity uniquely and thus drives BBU differently. In this paper, we introduce a simulation tool to investigate the filling pattern dependence of the ERL BBU instability.
Organisation
ASTeC
,
ASTeC-AP
,
CI
,
STFC
Keywords
linac
,
simulation
,
HOM
,
electron
,
cavity
Funding Information
Related Research Object(s):
Licence Information:
Language
English (EN)
Type
Details
URI(s)
Local file(s)
Year
Paper In Conference Proceedings
In 12th International Particle Accelerator Conference (IPAC 2021), Campinas, Brazil, 24-28 May 2021, International Particle Accelerator Conference (2021): 1431-1434.
doi:10.18429/JACoW-IPAC2021-TUPAB038
2021
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