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Energy-Spread Preservation and High Efficiency in a Plasma-Wakefield Accelerator
C A Lindstrøm1, J M Garland1, S Schröder1,2
1Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607 Hamburg, Germany.
Physical Review Letters
|January 22, 2021
Summary
Researchers achieved energy-efficient plasma-wakefield acceleration using tailored electron bunches. This method boosts efficiency and preserves low energy spread, crucial for future compact accelerators and free-electron lasers.
Area of Science:
- Plasma physics
- Particle acceleration
- Accelerator physics
Background:
- Plasma-wakefield acceleration offers a path to compact accelerators.
- Achieving high efficiency and low energy spread simultaneously is challenging.
- Tailored electron bunch profiles are key to optimizing beam loading.
Purpose of the Study:
- To experimentally demonstrate optimal beam loading in a nonlinear plasma accelerator.
- To achieve simultaneous high energy gain and low energy spread.
- To validate theoretical predictions for tailored bunch profiles.
Main Methods:
- Utilized a nonlinear electron-driven plasma accelerator.
- Employed electron bunches with carefully tailored current profiles.
- Measured energy gain, energy spread, and energy-transfer efficiency.
Main Results:
- Achieved 45 MeV energy gain for 1 GeV electron bunches.
- Demonstrated an energy-transfer efficiency of (42±4)%.
- Preserved per-mille energy spreads and showed wakefield flattening.
Conclusions:
- Optimal beam loading with tailored bunches enables efficient particle acceleration.
- This technique is viable for compact free-electron lasers and particle colliders.
- Experimental results confirm theoretical models for advanced plasma accelerators.
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