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    Area of Science:

    • Plasma Physics
    • High-Energy-Density Physics
    • Laser-Plasma Interactions

    Background:

    • Laser wakefield acceleration (LWFA) is a promising method for generating high-energy electrons and secondary radiation.
    • Producing intense and stable X-ray beams from LWFA requires precise control over laser pulse propagation in plasma targets.

    Purpose of the Study:

    • To investigate the scaling of X-ray emission from synchrotron radiation generated during LWFA.
    • To analyze the physical processes governing the generation of intense and stable X-ray beams.
    • To determine the photon yield scaling law for hard X-rays (10-40 keV) and estimate emission at higher laser powers.

    Main Methods:

    • Experimental campaigns utilizing the INRS high-power laser system.
    • Generation of relativistic laser pulses and their stable propagation in gas jet targets via self-guiding.
    • Measurement and analysis of hard X-ray emission (10-40 keV).

    Main Results:

    • Achieved stable propagation of relativistic laser pulses over lengths exceeding dephasing and depletion limits.
    • Generated intense hard X-ray beams with up to 200 TW on target.
    • Established an experimental scaling law for photon yield in the 10-40 keV range.

    Conclusions:

    • Stable self-guiding of intense laser pulses in gas targets enables efficient generation of hard X-ray beams.
    • The derived scaling law provides a basis for predicting X-ray yields at various laser parameters.
    • Extrapolation suggests significant X-ray emission capabilities at the emerging 1 PW laser power level.