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Optical control of hard X-ray polarization by electron injection in a laser wakefield accelerator.


ABSTRACT: Laser-plasma particle accelerators could provide more compact sources of high-energy radiation than conventional accelerators. Moreover, because they deliver radiation in femtosecond pulses, they could improve the time resolution of X-ray absorption techniques. Here we show that we can measure and control the polarization of ultra-short, broad-band keV photon pulses emitted from a laser-plasma-based betatron source. The electron trajectories and hence the polarization of the emitted X-rays are experimentally controlled by the pulse-front tilt of the driving laser pulses. Particle-in-cell simulations show that an asymmetric plasma wave can be driven by a tilted pulse front and a non-symmetric intensity distribution of the focal spot. Both lead to a notable off-axis electron injection followed by collective electron-betatron oscillations. We expect that our method for an all-optical steering is not only useful for plasma-based X-ray sources but also has significance for future laser-based particle accelerators.

SUBMITTER: Schnell M 

PROVIDER: S-EPMC3778521 | biostudies-literature | 2013

REPOSITORIES: biostudies-literature

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Optical control of hard X-ray polarization by electron injection in a laser wakefield accelerator.

Schnell Michael M   Sävert Alexander A   Uschmann Ingo I   Reuter Maria M   Nicolai Maria M   Kämpfer Tino T   Landgraf Björn B   Jäckel Oliver O   Jansen Oliver O   Pukhov Alexander A   Kaluza Malte Christoph MC   Spielmann Christian C  

Nature communications 20130101


Laser-plasma particle accelerators could provide more compact sources of high-energy radiation than conventional accelerators. Moreover, because they deliver radiation in femtosecond pulses, they could improve the time resolution of X-ray absorption techniques. Here we show that we can measure and control the polarization of ultra-short, broad-band keV photon pulses emitted from a laser-plasma-based betatron source. The electron trajectories and hence the polarization of the emitted X-rays are e  ...[more]

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