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Magnetically Induced Rotating Rayleigh-Taylor Instability
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Harmonic Generation and Inverse Cascade in the z-Pinch Driven, Preseeded Multimode, Magneto-Rayleigh-Taylor

D E Ruiz1, D A Yager-Elorriaga1, K J Peterson1

  • 1Sandia National Laboratories, P.O. Box 5800, Albuquerque, New Mexico 87185-1186, USA.

Physical Review Letters
|July 8, 2022
PubMed
Summary
This summary is machine-generated.

This study presents the first experimental evidence of mode mixing and inverse-cascade processes in the magneto-Rayleigh-Taylor instability (MRTI) during magnetic implosion. These findings are crucial for understanding astrophysical systems and inertial fusion energy.

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Area of Science:

  • Plasma physics
  • Astrophysical phenomena
  • Inertial confinement fusion

Background:

  • Magneto-Rayleigh-Taylor instability (MRTI) is critical in astrophysics and inertial fusion.
  • MRTI degrades confinement and target performance in fusion applications.
  • Understanding nonlinear coupling of modes in MRTI is essential.

Purpose of the Study:

  • To provide the first experimental evidence of mode mixing and inverse-cascade in MRTI.
  • To investigate the nonlinear coupling of preseeded axial modes in a magnetically imploded aluminum liner.
  • To compare experimental results with simulations and theoretical models.

Main Methods:

  • Magnetic implosion of an aluminum liner using the 20-MA Z Machine.
  • Temporal evolution of MRTI captured using four radiographs.
  • Novel unfold technique for analyzing experimental radiographs.
  • Comparison with radiation magnetohydrodynamics code (hydra) simulations and a weakly nonlinear model.

Main Results:

  • Experimental observation of mode mixing and inverse-cascade onset.
  • Good quantitative agreement between experimental data and hydra simulations.
  • Simulations show harmonic generation, mode coupling, and inverse-cascade.
  • Validation of a novel unfold technique for MRTI analysis.

Conclusions:

  • The study establishes a benchmark for future MRTI research.
  • Experimental findings support theoretical understanding of nonlinear mode coupling.
  • Motivates development of new analytical theories for MRTI.
  • Highlights the importance of MRTI in fusion energy and astrophysics.