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Plasma electron trapping and acceleration in a plasma wake field using a density transition
H Suk1, N Barov, J B Rosenzweig
1Department of Physics and Astronomy, University of California at Los Angeles, Los Angeles, California 90095, USA.
Physical Review Letters
|February 15, 2001
Summary
A novel method uses a sharp plasma density transition to trap background electrons into a plasma wake field for particle acceleration. This technique enhances electron injection for advanced plasma-based accelerators.
Area of Science:
- Plasma Physics
- Particle Acceleration
- Beam Dynamics
Background:
- Plasma wake field acceleration (PWFA) requires efficient electron injection.
- Conventional injection methods face limitations in controlling trapped particle dynamics.
Purpose of the Study:
- To present a new scheme for injecting plasma electrons into the acceleration phase of a plasma wake field.
- To investigate the underlying trapping and acceleration mechanisms.
Main Methods:
- A single, short electron pulse is propagated through an underdense plasma with a localized density down-ramp.
- Two-dimensional particle-in-cell simulations were used to verify the scheme.
- One-dimensional Hamiltonian analysis and simulations were performed for detailed mechanism investigation.
Main Results:
- Background plasma electrons are effectively trapped in the plasma wake field near the density transition.
- The trapping is attributed to the rapid increase in the wake wave wavelength at the density down-ramp.
- Simulations confirmed the viability and provided insights into the trapping and acceleration processes.
Conclusions:
- The proposed scheme offers a viable method for controlled plasma electron injection.
- This approach has potential implications for improving the performance of plasma wake field accelerators.