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X-ray backlighting of imploding aluminium liners on PTS facility.

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Area of Science:

  • Plasma Physics
  • High-Energy-Density Physics
  • Materials Science

Background:

  • Advanced X-ray imaging is crucial for studying dynamic processes in high-energy-density physics.
  • Understanding material behavior under extreme conditions, such as imploding liners, is essential for fusion energy research.

Purpose of the Study:

  • To introduce novel X-ray backlighting systems for radiography.
  • To present preliminary experimental results on the behavior of perturbed aluminum liners.

Main Methods:

  • Development and implementation of two X-ray backlighting systems: a 1.865 keV (Si Heα line) spherically bent crystal imager and an ~8.3 keV (Cu Heα line) point-projection imager.
  • Utilizing a 1 TW, 1 kJ Nd:glass high-power laser system to generate the X-ray backlighter source.
  • Radiography of aluminum liners with seeded sinusoidal perturbations driven by a ~7.5 MA current.

Main Results:

  • Successful observation of ablation melt on the outer edge of imploding aluminum liners.
  • Detection of instability development in the imploding aluminum liner outer edge.
  • Demonstration of the capability of the new X-ray backlighting systems in capturing these phenomena.

Conclusions:

  • The newly fielded X-ray backlighting systems are effective tools for diagnosing dynamic processes in high-energy-density experiments.
  • The observed ablation melt and instability provide critical data for validating physics models of liner implosion.
  • These systems pave the way for more detailed investigations into material behavior under extreme conditions.