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A scheme to obtain brilliant x-ray sources by coherent reflection of a counter-propagating pulse from laser-driven dense electron sheets is theoretically and numerically investigated in a self-consistent manner. A radiation pressure acceleration model for the dynamics of the electron sheets blown out from laser-irradiated ultrathin foils is developed and verified by PIC simulations. The first multidimensional and integral demonstration of the scheme by 2D PIC simulations is presented. It is found that the reflected pulse undergoes Doppler-upshift by a factor 4?z2, where ?z = (1- vz2/c2)-1/2 is the effective Lorentz factor of the electron sheet al ong its normal direction. Meanwhile the pulse electric field is intensified by a factor depending on the electron density of the sheet in its moving frame ne/?, where ? is the full Lorentz factor.
Bibliographical noteThe work was supported by EPSRC (grants EP/C003586/1 and EP/D/06337X/1). MZ acknowledges the support from the Royal Society. BQ acknowledges the support from the Alexander von Humboldt Foundation and useful discussions with X T He and C T Zhou at Center for Applied Physics and Technology, Peking University.
ASJC Scopus subject areas
- Physics and Astronomy(all)
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