Observation of Rayleigh-Taylor-instability evolution in a plasma with magnetic and viscous effects

Adams, C. S.; Moser, Auna; Hsu, S. C.

doi:10.1103/physreve.92.051101

Cited by 10 publications

(5 citation statements)

References 29 publications

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“…By comparing surveyspectroscopy data with non-local-thermodynamic-equilibrium (non-LTE) PrismSPECT [38] spectral calculations that utilize n e values consistent with interferometry data, we are able to place bounds on T e and Z of the observed plasma volume; this methodology was previously described in detail [13] and applied in multiple experimental configurations [13]- [16], [39]. Figure 12(a) shows an example of spectra from several viewing chords, showing that there is little variation over these chords.…”

Section: ) Survey Spectroscopymentioning

confidence: 99%

Experiment to Form and Characterize a Section of a Spherically Imploding Plasma Liner

Hsu

Langendorf

Yates

et al. 2018

IEEE Trans. Plasma Sci.

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Abstract-We describe an experiment to form and characterize a section of a spherically imploding plasma liner by merging six supersonic plasma jets that are launched by newly designed contoured-gap coaxial plasma guns. This experiment is a prelude to forming a fully spherical imploding plasma liner using many dozens of plasma guns, as a standoff driver for plasma-jet-driven magneto-inertial fusion. The objectives of the six-jet experiments are to assess the evolution and scalings of liner Mach number and uniformity, which are important metrics for spherically imploding plasma liners to compress magnetized target plasmas to fusion conditions. This paper describes the design of the coaxial plasma guns, experimental characterization of the plasma jets, six-jet experimental setup and diagnostics, initial diagnostic data from three-and six-jet experiments, and the high-level objectives of associated numerical modeling.

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Section: ) Survey Spectroscopymentioning

confidence: 99%

Experiment to Form and Characterize a Section of a Spherically Imploding Plasma Liner

Hsu

Langendorf

Yates

et al. 2018

IEEE Trans. Plasma Sci.

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“…This is due to the fact that many theoretical and numerical studies use the conventional hydrodynamic and magnetohydrodynamic (MHD) depiction where either the self-consistent effects of magnetic fields, viscosity and resistivity have been ignored or they have been considered in isolation. First observations of magneto-RTI evolution in the presence of magnetic and viscous effects have been made in recent experiments (Adams, Moser & Hsu 2015). The impact of magnetic fields on RTI in the presence of a self-consistent viscosity and resistivity for experimentally and observationally relevant parameter regimes in HED plasmas remains an open area of research.…”

Section: Introductionmentioning

confidence: 99%

The effect of viscosity and resistivity on Rayleigh–Taylor instability induced mixing in magnetized high-energy-density plasmas

2022

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This work numerically investigates the role of viscosity and resistivity in Rayleigh–Taylor instabilities in magnetized high-energy-density (HED) plasmas for a high Atwood number and high plasma beta regimes surveying across plasma beta and magnetic Prandtl numbers. The numerical simulations are performed using the visco-resistive magnetohydrodynamic equations. Results presented here show that the inclusion of self-consistent viscosity and resistivity in the system drastically changes the growth of the Rayleigh–Taylor instability (RTI) as well as modifies its internal structure at smaller scales. It is seen here that the viscosity has a stabilizing effect on the RTI. Moreover, the viscosity inhibits the development of small-scale structures and also modifies the morphology of the tip of the RTI spikes. On the other hand, the resistivity reduces the magnetic field stabilization, supporting the development of small-scale structures. The morphology of the RTI spikes is seen to be unaffected by the presence of resistivity in the system. An additional novelty of this work is in the disparate viscosity and resistivity profiles that may exist in HED plasmas and their impact on RTI growth, morphology and the resulting turbulence spectra. Furthermore, this work shows that the dynamics of the magnetic field is independent of viscosity and likewise the resistivity does not affect the dissipation of enstrophy and kinetic energy. In addition, power law scalings of enstrophy, kinetic energy and magnetic field energy are provided in both the injection range and inertial sub-range, which could be useful for understanding RTI induced turbulent mixing in HED laboratory and astrophysical plasmas and could aid in the interpretation of observations of RTI-induced turbulence spectra.

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“…In the classical domain a stratified plasma in presence of a gravitational field inevitably exhibits Rayleigh-Taylor instability (RTI) [1,2] and/or internal waves depending upon the stability criterion of the stratification [3][4][5][6][7][8]. More specifically, in a two fluid system; if a denser fluid (density ρ h ) is being supported by a lighter fluid (density ρ l , where ρ l <ρ h ) in presence of gravity then this classical instability occurs.…”

Section: Introductionmentioning

confidence: 99%

Rayleigh Taylor like instability in presence of shear velocity in a strongly coupled quantum plasma

2020

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The Rayleigh-Taylor like instability (RTI) is investigated in a strongly correlated quantum plasma (SCQP) under the influence of shear velocity. We implement the general hydrodynamic (GH) model with quantum corrections in order to study the system characteristics. The quantum correction comes to the effect via weakly coupled, fully degenerate, non-relativistic electrons; whereas the non-degenerate ions are taken to be strongly correlated. In order to investigate RTI in shorter wavelength regime we consider an exponential equilibrium density profile in presence of gravity. In the incompressible limit, it is observed that the shear velocity has both stabilizing and destabilizing effect on RTI depending upon the direction of the gradient of the shear velocity. In contrary, for the compressible case, shear velocity has a destabilizing effect on RTI irrespective of the direction of the gradient of the shear velocity. The observed results can be pretty handy in understanding the suppression of RTI in some dense white dwarfs or ultra cold stars where the constituents are weakly degenerate electrons and strongly correlated ions within quantum limits.

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Observation of Rayleigh-Taylor-instability evolution in a plasma with magnetic and viscous effects

Cited by 10 publications

References 29 publications

Experiment to Form and Characterize a Section of a Spherically Imploding Plasma Liner

Experiment to Form and Characterize a Section of a Spherically Imploding Plasma Liner

The effect of viscosity and resistivity on Rayleigh–Taylor instability induced mixing in magnetized high-energy-density plasmas

Rayleigh Taylor like instability in presence of shear velocity in a strongly coupled quantum plasma

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