Investigation of radiative bow-shocks in magnetically accelerated plasma flows

Bott-Suzuki, S. C.; Bendixsen, L. S. Caballero; Cordaro, S. W.; Blesener, I. C.; Hoyt, C. L.; Cahill, A. D.; Kusse, B. R.; Hammer, D. A.; Gourdain, P. A.; Seyler, C. E.; Greenly, J. B.; Chittenden, J. P.; Niasse, N.; Lebedev, S. V.; Ampleford, David J.

doi:10.1063/1.4921735

Cited by 10 publications

(3 citation statements)

References 35 publications

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“…Pulsed-power driven experiments provide a natural platform for producing magnetized HED plasma flows, and several experiments have demonstrated the formation of shocks where the magnetic field is important for the shock structure. [19][20][21] In this paper, we show how the orientation of the magnetic field embedded in a supersonic (M S v flow /c S ¼ 5), super-Alfv enic (M A v flow /v A ¼ 2), plasma flow dramatically affects the structure of bow shocks formed around conducting, cylindrical obstructions. When the upstream magnetic field lies parallel to the obstacle, sharp bow shocks are formed with a global structure determined by the fast magneto-sonic Mach number.…”

Section: Introductionmentioning

confidence: 95%

The structure of bow shocks formed by the interaction of pulsed-power driven magnetised plasma flows with conducting obstacles

et al. 2017

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We present an experimental study of the development and structure of bow shocks produced by the interaction of a magnetised, collisional, super-Alfv enic plasma flow with conducting cylindrical obstacles. The plasma flow with an embedded, frozen-in magnetic field (Re M $ 20) is produced by the current-driven ablation of fine aluminium wires in an inverse, exploding wire array z-pinch. We show that the orientation of the embedded field with respect to the obstacles has a dramatic effect on the bow shock structure. When the field is aligned with the obstacle, a sharp bow shock is formed with a global structure that is determined simply by the fast magneto-sonic Mach number. When the field is orthogonal to the obstacle, magnetic draping occurs. This leads to the growth of a magnetic precursor and the subsequent development of a magnetised bow shock that is mediated by two-fluid effects, with an opening angle and a stand-off distance, that are both many times larger than in the parallel geometry. By changing the field orientation, we change the fluid regime and physical mechanisms that are responsible for the development of the bow shocks. MHD simulations show good agreement with the structure of well-developed bow shocks. However, collisionless, two-fluid effects will need to be included within models to accurately reproduce the development of the shock with an orthogonal B-field. Published by AIP Publishing.

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Section: Introductionmentioning

confidence: 95%

The structure of bow shocks formed by the interaction of pulsed-power driven magnetised plasma flows with conducting obstacles

et al. 2017

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“…Here, λ ii is the ion-ion MFP, L is the characteristic size of the plasma, V is the characteristic bulk flow velocity and η is the magnetic diffusivity. Pulsed-power has been used extensively to study physics relevant to supersonic astrophysical jets, such as the interaction of plasma jets with neutral gases (Suzuki-Vidal et al 2012, 2013, the fragmentation of radiatively cooled bow shocks in counter-propagating jets (Suzuki-Vidal et al 2015), and the structure of magnetized oblique shocks (Swadling et al 2013), planar shocks (Lebedev et al 2014) and quasi-two-dimensional (quasi-2-D) bow shocks (Ampleford et al 2010;Bott-Suzuki et al 2015;Burdiak et al 2017).…”

Section: Introductionmentioning

confidence: 99%

The structure of 3-D collisional magnetized bow shocks in pulsed-power-driven plasma flows

et al. 2022

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We investigate three-dimensional (3-D) bow shocks in a highly collisional magnetized aluminium plasma, generated during the ablation phase of an exploding wire array on the MAGPIE facility (1.4 MA, 240 ns). Ablation of plasma from the wire array generates radially diverging, supersonic ( $M_S \sim 7$ ), super-Alfvénic ( $M_A > 1$ ) magnetized flows with frozen-in magnetic flux ( $R_M \gg 1$ ). These flows collide with an inductive probe placed in the flow, which serves both as the obstacle that generates the magnetized bow shock, and as a diagnostic of the advected magnetic field. Laser interferometry along two orthogonal lines of sight is used to measure the line-integrated electron density. A detached bow shock forms ahead of the probe, with a larger opening angle in the plane parallel to the magnetic field than in the plane normal to it. Since the resistive diffusion length of the plasma is comparable to the probe size, the magnetic field decouples from the ion fluid at the shock front and generates a hydrodynamic shock, whose structure is determined by the sonic Mach number, rather than the magnetosonic Mach number of the flow. The 3-D simulations performed using the resistive magnetohydrodynamic (MHD) code Gorgon confirm this picture, but under-predict the anisotropy observed in the shape of the experimental bow shock, suggesting that non-MHD mechanisms may be important for modifying the shock structure.

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“…Earlier work by Meinecke et al (2014) showed that MHD turbulence could be achieved after a laser driven plasma flow generated from a carbon rod had been passed through a grid. Experiments to generate MHD turbulence could also be performed using magnetized plasma flows generated with pulsed power drivers (Lebedev et al 2014;Bott-Suzuki et al 2015;Burdiak et al 2017;Lebedev et al ress) In this paper, we report on simulations that also used a grid to generate turbulence from an initially laminar flow. Using the adaptive mesh refinement (AMR), MHD code As-troBEAR, we tracked the evolution of the flow to explore the conditions under which turbulence could be generated.…”

Section: Introductionmentioning

confidence: 99%

Hydrodynamic and magnetohydrodynamic simulations of wire turbulence

Fogerty

Liu

Frank

et al. 2019

High Energy Density Physics

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We report on simulations of laboratory experiments in which magnetized supersonic flows are driven through a wire mesh. The goal of the study was to investigate the ability of such a configuration to generate supersonic, MHD turbulence. We first report on the morphological structures that develop in both magnetized and non-magnetized cases. We then analyze the flow using a variety of statistical measures, including power spectra and probability distribution functions of the density. Using these results we estimate the sonic mach number in the flows downstream of the wire mesh. We find the initially hypersonic (M s = 20) planar shock through the wire mesh does lead to downstream turbulent conditions. However, in both magnetized and non-magnetized cases, the resultant turbulence was marginally supersonic to transonic (M s ∼ 1), and highly anisotropic in structure.

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Investigation of radiative bow-shocks in magnetically accelerated plasma flows

Cited by 10 publications

References 35 publications

The structure of bow shocks formed by the interaction of pulsed-power driven magnetised plasma flows with conducting obstacles

The structure of bow shocks formed by the interaction of pulsed-power driven magnetised plasma flows with conducting obstacles

The structure of 3-D collisional magnetized bow shocks in pulsed-power-driven plasma flows

Hydrodynamic and magnetohydrodynamic simulations of wire turbulence

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