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Beam Realignment with Emittance Preservation in a Plasma Wakefield-Accelerator Stage.

Lance Hildebrand1,2, Yujian Zhao1,2, Weiming An3,4

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Summary
This summary is machine-generated.

Drive-beam-induced ion motion can mitigate hosing instability in plasma-based accelerators. This method realigns witness beams, improving collider performance despite minor emittance growth.

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Area of Science:

  • Plasma physics
  • Particle accelerators
  • Beam dynamics

Background:

  • Plasma-based accelerators use drive beams to create wakes for accelerating witness beams.
  • Beam misalignment in linear colliders causes hosing instability and emittance growth, hindering beam collision.
  • High-charge, small-spot electron beams induce nonlinear focusing forces due to ion motion.

Purpose of the Study:

  • To investigate the use of drive-beam-induced ion motion to suppress witness beam hosing and achieve realignment.
  • To assess the impact of this method on beam quality, including emittance and energy spread.
  • To evaluate the energy transfer efficiency in plasma acceleration stages.

Main Methods:

  • Utilized fully self-consistent qpad simulations.
  • Modeled plasma stages with quasi-adiabatic plasma density ramps.
  • Analyzed beam dynamics under nonlinear focusing forces from driven ion motion.

Main Results:

  • Demonstrated the elimination of witness beam hosing and successful realignment with the drive beam.
  • Achieved simultaneous beam matching with a centroid offset reduction.
  • Observed approximately 4% emittance growth and <1% energy spread growth.
  • Reported a 50% energy transfer efficiency.

Conclusions:

  • Drive-beam-induced ion motion is an effective technique for controlling witness beam hosing and misalignment.
  • This method offers a viable solution for improving beam quality in plasma-based linear colliders.
  • The simulations show a promising balance between instability mitigation and beam quality preservation.