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Resolving hot spot microstructure using x-ray penumbral imaging (invited).

B Bachmann1, T Hilsabeck2, J Field1

  • 1Lawrence Livermore National Laboratory, Livermore, California 94550, USA.

The Review of Scientific Instruments
|December 3, 2016
PubMed
Summary
This summary is machine-generated.

X-ray penumbral imaging achieves sub-10 micrometer resolution for hot spot plasmas in inertial confinement fusion experiments. This advanced technique overcomes limitations of traditional imaging methods, revealing internal plasma microstructures.

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Area of Science:

  • Plasma physics
  • High-energy-density physics
  • X-ray imaging

Background:

  • Stagnated plasma cores (hot spots) are crucial in inertial confinement fusion (ICF).
  • Accurate imaging of these hot spots is essential for understanding fusion performance.
  • Conventional imaging techniques face resolution and sensitivity limitations.

Purpose of the Study:

  • To develop and implement sub-10 micrometer resolution x-ray imaging for ICF targets.
  • To evaluate x-ray penumbral imaging as an advancement over existing methods.
  • To resolve internal microstructures within hot spot plasmas.

Main Methods:

  • Utilized x-ray penumbral imaging with tungsten and tantalum apertures (20 μm to 2 mm).
  • Employed image plate and gated x-ray detectors with magnifications from 4x to 64x.
  • Analyzed experimental design, image reconstruction influences, and artifact mitigation strategies.

Main Results:

  • Achieved sub-10 μm resolution imaging of hot spot plasmas at x-ray energies > 5 keV.
  • Demonstrated superior performance compared to Fraunhofer and pinhole imaging.
  • Successfully resolved internal hot spot microstructures.

Conclusions:

  • X-ray penumbral imaging is a powerful tool for high-resolution diagnostics in ICF.
  • The technique provides critical insights into plasma dynamics and fusion processes.
  • Further optimization can enhance diagnostic capabilities for future experiments.