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Coupled beam hose and self-modulation instabilities in overdense plasma.
C B Schroeder1, C Benedetti, E Esarey
1Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA.
Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|September 26, 2012
Summary
Transverse stability in plasma wakefield accelerators is crucial. This study reveals that beam hosing instabilities are comparable to self-modulation, significantly altering plasma wakefield structures.
Area of Science:
- Plasma physics
- Particle accelerators
- Beam dynamics
Background:
- Transverse stability of relativistic particle beams is essential for plasma wakefield accelerators.
- Beams in overdense plasmas can experience envelope modulation and centroid displacement (hosing) instabilities.
Purpose of the Study:
- To analyze the transverse stability of a drive beam in plasma wakefield accelerators.
- To investigate the interplay between self-modulation and hosing instabilities.
- To understand the impact of hosing on plasma wakefield structures.
Main Methods:
- Derivation of coupled equations for beam centroid and envelope.
- Solving these coupled equations to determine instability growth rates.
- Analyzing the effects of instability coupling on beam dynamics.
Main Results:
- Hosing instability growth rates are found to be comparable to self-modulation growth rates.
- Coupling between self-modulation and hosing enhances beam hosing.
- Self-modulation induces harmonic content in the beam.
- Significant hosing alters plasma wakefield structures.
Conclusions:
- Beam hosing is a significant instability in plasma wakefield accelerators.
- The coupling of instabilities can lead to complex beam dynamics.
- Understanding these instabilities is key to controlling plasma wakefields for acceleration.
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