Resonant emittance mixing of flat beams in plasma accelerators
arxiv(2024)
摘要
Plasma accelerators sustain large field gradients and could enable future
compact linear colliders. To achieve the required high luminosity, linear
colliders rely on flat beams to avoid potentially deleterious beamstrahlung
effects. Here, we show that flat beams in plasma accelerators can be subject to
beam quality degradation due to emittance mixing caused by transverse coupling
in the wakefields. When there is a resonance between the betatron oscillations
in the horizontal and vertical planes for the beam particles in a coupled
wakefield, the transverse emittances fully exchange, leading to a round beam.
Depending on the mechanism causing the resonance, the use of laser drivers,
flat particle beam drivers, or hollow plasma channels can avoid the resonance
and mitigate the emittance deterioration.
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