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Atomic Absorption Spectroscopy: Radiation and Light Sources01:13

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Applying X-ray Imaging Crystal Spectroscopy for Use as a High Temperature Plasma Diagnostic
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Optimisation of a laser-driven X-ray source operating in air.

Alicia Reija, Andrew Coathup, Aarón Alejo

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    |April 12, 2025
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    Summary

    We optimized a compact laser-driven X-ray source using simple equipment. This compact X-ray source achieves a high photon flux competitive with complex vacuum-based systems.

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    Area of Science:

    • Physics
    • Materials Science
    • Engineering

    Background:

    • Synchrotron and X-ray Free Electron Laser (XFEL) facilities are complex, scarce, and not easily accessible.
    • Laser-driven X-ray sources offer a compact, high-photon-yield alternative with micrometric source sizes.
    • Accessibility and cost-effectiveness are key drivers for developing advanced X-ray generation methods.

    Purpose of the Study:

    • To optimize a laser-driven X-ray source using readily available components.
    • To characterize the main X-ray beam parameters, including flux and spatial distribution.
    • To assess the competitiveness of this source against existing vacuum-based and gas-environment laser-driven X-ray sources.

    Main Methods:

    • Utilized 0.8 mJ, 35 fs laser pulses focused onto a solid Copper (Cu) target in ambient air.
    • Employed a simple experimental setup for X-ray generation and characterization.
    • Measured the Cu Kα flux and analyzed the spatial distribution of the X-ray continuum.

    Main Results:

    • Achieved a Cu Kα flux of 2.3 × 10^9 photons/s in 2π steradians.
    • Observed a non-isotropic continuum emission, concentrated within a cone of approximately 14° semiangle along the target normal.
    • Demonstrated flux competitiveness with vacuum-based laser-driven X-ray sources.

    Conclusions:

    • The optimized laser-driven X-ray source provides a high flux (2.3 × 10^9 photons/s) with a compact setup in air.
    • The non-isotropic emission pattern offers potential for directional applications.
    • This source presents a viable and cost-effective alternative to more complex laser-driven X-ray systems.