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Pinhole-array x-ray spectrometer for laser-fusion experiments.

B Yaakobi, F J Marshall, D K Bradley

    Applied Optics
    |February 28, 2008
    PubMed
    Summary
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    A novel pinhole-array x-ray spectrometer provides high-resolution images of laser-fusion targets. This instrument images the compressed target core using Ti-Kalpha fluorescence, revealing details otherwise only visible with backlighting.

    Area of Science:

    • Plasma Physics
    • X-ray Spectroscopy
    • Laser-Induced Fusion

    Background:

    • Laser-fusion experiments require precise diagnostics for compressed core imaging.
    • Traditional x-ray spectrometers face limitations in spatial and spectral resolution for these applications.

    Purpose of the Study:

    • To demonstrate a pinhole-array x-ray spectrometer for enhanced laser-fusion diagnostics.
    • To achieve high spectral resolution and image compressed target cores.

    Main Methods:

    • Utilizing an array of approximately 300 pinholes in conjunction with a flat-crystal spectrometer.
    • Analyzing Ti-Kalpha line fluorescence from a Ti-doped shell excited by continuum radiation.

    Main Results:

    • Achieved target imaging with photon energies separated by ~10 eV (4-5 keV).

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  • Successfully imaged the cold, compressed target core at peak compression using Kalpha fluorescence.
  • Demonstrated high spectral resolution due to reduced effective source size.

    • Conclusions:

    • The pinhole-array spectrometer offers a viable method for imaging compressed cores in laser-fusion experiments.
    • This technique provides an alternative to backlighting for visualizing dense plasma structures.
    • The instrument enhances spectral resolution, crucial for detailed plasma analysis.