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Uniform laser-driven relativistic electron layer for coherent Thomson scattering.

H-C Wu¹, J Meyer-ter-Vehn, J Fernández

¹Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA. hcwu@lanl.gov

Physical Review Letters

|September 28, 2010

Summary

A new method generates uniform relativistic electron layers using a laser and two foils for enhanced Thomson backscattering. This technique creates a highly uniform electron flyer for efficient X-ray generation.

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Area of Science:

Plasma Physics
Laser-Plasma Interactions
Particle Acceleration

Background:

Coherent Thomson backscattering requires high-quality electron beams.
Generating uniform relativistic electron layers is challenging for efficient X-ray production.

Purpose of the Study:

To propose and validate a novel scheme for generating uniform relativistic electron layers.
To enable efficient coherent Thomson backscattering for X-ray generation.

Main Methods:

Utilizing a few-cycle laser pulse interacting with an ultrathin solid foil.
Employing an additional foil to reflect the drive laser pulse.
Conducting two-dimensional particle-in-cell simulations and theoretical analysis.

Main Results:

The scheme successfully generates a uniform relativistic electron layer (flyer).
The electron flyer cruises with high relativistic factor (γ) and no transverse momentum.
Achieved a full Doppler shift factor of 4γ(2) for backscattered probe light.

Conclusions:

The proposed scheme is effective for producing uniform relativistic electron layers.
This method enhances coherent Thomson backscattering efficiency.
The study discusses reflectivity and layer expansion effects on X-ray generation.