Coherent Thomson backscattering from laser-driven relativistic ultra-thin electron layers |
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Authors: | J Meyer-ter-Vehn and H-C Wu |
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Institution: | (1) Physics Department, M.V. Lomonosov Moscow State University, Vorobyevy gory, 119992 Moscow, Russia;(2) Department of Physics, University of Lund, P.O. Box 118, 22100 Lund, Sweden;(3) Max-Planck-Institut f?r Quantenoptik, Hans-Kopfermann-Str. 1, 85748 Garching, Germany |
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Abstract: | The generation of laser-driven dense relativistic
electron layers from ultra-thin foils and their use for
coherent Thomson backscattering is discussed, applying analytic
theory and one-dimensional particle-in-cell simulation. The blow-out
regime is explored in which all foil electrons are separated from
ions by direct laser action. The electrons follow the light wave
close to its leading front. Single electron solutions are applied to
initial acceleration, phase switching, and second-stage boosting.
Coherently reflected light shows Doppler-shifted spectra, chirped
over several octaves. The Doppler shift is found ∝ γx
2=1/(1-βx
2), where βx is the electron
velocity component in normal direction of the electron layer which
is also the direction of the driving laser pulse. Due to transverse
electron momentum py, the Doppler shift by
4γx
2=4γ2/(1+(py/mc)2)≈2γ
is significantly smaller than full shift of 4γ2.
Methods to turn py→0 and to recover the
full Doppler shift are proposed and verified by 1D-PIC simulation.
These methods open new ways to design intense single attosecond pulses. |
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Keywords: | |
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