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Pinching-off of Coated Vesicles01:32

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Micropinch formation dynamics in X pinches.

A T Elshafiey1,2, N G Chalmers2, D A Hammer2

  • 1<a href="https://ror.org/01e41cf67">Los Alamos National Laboratory</a>, Los Alamos, New Mexico 87544, United States of America.

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Micropinch formation in copper plasmas involves rapid implosion and outflow, not radiative collapse. X-ray streak camera studies reveal key plasma conditions influencing this process.

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Area of Science:

  • Plasma Physics
  • X-ray Astronomy
  • Fusion Energy Research

Background:

  • Micropinch discharges are crucial for understanding high-energy phenomena.
  • Previous models suggested radiative collapse plays a key role in micropinch formation.

Purpose of the Study:

  • To investigate the plasma conditions during micropinch formation in copper hybrid pinches.
  • To determine the role of radiative collapse in micropinch dynamics.

Main Methods:

  • High temporal resolution X-ray streak camera studies.
  • Analysis of Ne-like and Li-like copper spectral lines.
  • Two-dimensional extended Magnetohydrodynamic (MHD) simulations coupled with collisional-radiative spectral analysis.

Main Results:

  • Electron temperatures of approximately 200 eV and densities of 4.5×10^28 m^-3 were observed.
  • A significant temperature jump to about 1 keV was inferred from spectral line emission.
  • No evidence of rapid temperature change or radiation surge during the pre-continuum burst, ruling out significant radiative collapse.

Conclusions:

  • Radiative collapse is not the primary mechanism for micropinch formation in this system.
  • Micropinch formation is driven by rapid radial implosion, axial outflow, and dynamic plasma pressure.
  • The findings provide critical insights into plasma dynamics in high-energy density regimes.