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Related Experiment Video

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Stress Distribution During Cold Compression of Rocks and Mineral Aggregates Using Synchrotron-based X-Ray Diffraction
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Published on: May 20, 2018

Implosion dynamics and x-ray generation in small-diameter wire-array Z pinches.

V V Ivanov1, V I Sotnikov, J M Kindel

  • 1Department of Physics, University of Nevada, Reno, Nevada 89506, USA.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|June 13, 2009
PubMed
Summary
This summary is machine-generated.

Experiments show enhanced X-ray production in Z pinches, exceeding kinetic energy predictions. Smaller wire array diameters reveal non-kinetic plasma heating mechanisms, crucial for understanding energy dissipation.

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Area of Science:

  • Plasma Physics
  • High-Energy-Density Physics
  • X-ray Generation

Background:

  • Experimental X-ray energy output often surpasses calculated implosion kinetic energy and Spitzer resistive heating.
  • Mechanisms responsible for enhanced X-ray production in Z pinches remain under investigation.
  • Previous studies highlight the importance of wire array diameter in implosion dynamics and energy coupling.

Purpose of the Study:

  • To investigate enhanced plasma heating in small-diameter wire arrays.
  • To identify the transition in dominant plasma heating mechanisms with varying array diameters.
  • To explore non-kinetic plasma heating mechanisms in Z pinches.

Main Methods:

  • Review of experiments using cylindrical wire arrays (1-16 mm diameter) on the 1 MA Zebra generator.
  • Comparison of implosion and X-ray generation across different array diameters.
  • Utilized multiframe shadowgraphy and time-gated pinhole cameras to study implosion dynamics and bright spot formation.

Main Results:

  • Optimal X-ray power generation observed for 3-8 mm diameter loads.
  • Reduced X-ray power in 1-2 mm diameter loads linked to inefficient plasma heating and lower kinetic energy.
  • Electron temperature and density are dependent on array diameter, with faster plasma accumulation in smaller arrays.
  • Correlated bubble-like implosions and their initiation of bright spots were observed.

Conclusions:

  • Evidence supports non-kinetic plasma heating mechanisms in Z pinches, particularly in smaller diameter arrays.
  • Implosion bubble dynamics play a role in initiating bright spots within the pinch.
  • Understanding energy dissipation mechanisms in small-diameter wire arrays is crucial for optimizing X-ray generation.