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Stable Particle Acceleration in Coaxial Plasma Channels
Alexander Pukhov1, John P Farmer1
1Institut für Theoretische Physik I, Heinrich-Heine-Universität, 40225 Düssseldorf, Germany.
Physical Review Letters
|January 13, 2019
Summary
Researchers controlled plasma accelerator instabilities using a hollow plasma channel and coaxial filament. This enabled monoenergetic electron acceleration to 20 GeV with a high transformer ratio and efficiency.
Area of Science:
- Plasma Physics
- Particle Acceleration
- Computational Physics
Background:
- Plasma accelerators offer high accelerating gradients but are limited by beam instabilities.
- Achieving high transformer ratios is crucial for efficient particle acceleration.
Purpose of the Study:
- To investigate methods for controlling instabilities in plasma accelerators.
- To demonstrate enhanced electron beam acceleration using a novel plasma channel configuration.
Main Methods:
- Three-dimensional particle-in-cell (PIC) simulations were employed.
- A hollow plasma channel with a coaxial plasma filament was utilized to guide the electron beam.
Main Results:
- Instabilities were successfully controlled by scattering driver electrons from the filament.
- A strong chirp in the effective betatron frequency, induced by ion pinch, prevented beam breakup.
- Monoenergetic acceleration of an electron bunch to 20 GeV over 4.4 m was achieved.
- A transformer ratio of 10, 40% energy efficiency, and 1.8 μm emittance were demonstrated.
Conclusions:
- The proposed hollow plasma channel with a coaxial filament is an effective method for controlling plasma accelerator instabilities.
- This technique enables high-performance electron acceleration, paving the way for advanced accelerator designs.
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