Experimental Studies of Magnetically Driven Plasma Jets

Suzuki-Vidal, F.; Lebedev, S. V.; Bland, S. N.; Hall, G. N.; Swadling, G. F.; Harvey‐Thompson, A. J.; Burdiak, G.; Grouchy, P. de; Chittenden, J. P.; Marocchino, A.; Bocchi, M.; Ciardi, A.; Frank, Adam; Bott, S. C.

doi:10.1007/s10509-010-0543-3

Cited by 20 publications

(12 citation statements)

References 12 publications

(20 reference statements)

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“…The results show that the emission extends axially at least ∼6.5 cm from the initial position of the wires, limited by the field of view of the camera. The peak of the proton spectra of ∼100 keV is consistent with measurements of the voltage across the base of the magnetic cavity using an inductive probe (Suzuki-Vidal et al 2011, Burdiak et al 2013. Observation of the large emission region is consistent with the conditions needed to trap low-energy protons.…”

Section: Discussion and Future Worksupporting

confidence: 78%

Observation of energetic protons trapped in laboratory magnetic-tower jets

et al. 2013

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Preliminary results of the self-emission of charged particles from magnetically driven plasma jets has been investigated. The jets were launched and driven by a toroidal magnetic field generated by introducing a ∼1.4 MA, 250 ns electrical current pulse from the MAGPIE generator into a radial wire array. This configuration has shown to reproduce some aspects of the astrophysical magnetic-tower jet launching model, in which a jet is collimated by a toroidal magnetic field inside a magnetic cavity. The emission of ions and protons from the plasma was recorded onto Columbia Resin 39 plates using timeintegrated pinhole cameras. In addition a fly-eye camera, an array of 25-496 cylindrical apertures allowed estimating the location of the ion emitting source. The results show the ion emission comes from both the jet and its surrounding magnetic cavity, with the emission extending to a height of at least ∼9 cm from the initial position of the wires. The emission of ions is consistent with the

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Section: Discussion and Future Worksupporting

confidence: 78%

Observation of energetic protons trapped in laboratory magnetic-tower jets

et al. 2013

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“…1,4,11,34 We seek information about the flows, such as whether it is supersonic or not, super-Alfv enic or not, the flow direction at a random point, flow density, etc. All of the above are inflow properties that we can vary as parameters in the simulations.…”

Section: A Backgroundmentioning

confidence: 99%

Computational extended magneto-hydrodynamical study of shock structure generated by flows past an obstacle

Zhao¹,

Seyler

2015

Physics of Plasmas

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The magnetized shock problem is studied in the context where supersonic plasma flows past a solid obstacle. This problem exhibits interesting and important phenomena such as a bow shock, magnetotail formation, reconnection, and plasmoid formation. This study is carried out using a discontinuous Galerkin method to solve an extended magneto-hydrodynamic model (XMHD). The main goals of this paper are to present a reasonably complete picture of the properties of this interaction using the MHD model and then to compare the results to the XMHD model. The inflow parameters, such as the magnetosonic Mach number Mf and the ratio of thermal pressure to magnetic pressure β, can significantly affect the physical structures of the flow-obstacle interaction. The Hall effect can also significantly influence the results in the regime in which the ion inertial length is numerically resolved. Most of the results presented are for the two-dimensional case; however, two three-dimensional simulations are presented to make a connection to the important case in which the solar wind interacts with a solid body and to explore the possibility of performing scaled laboratory experiments.

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“…Second, the emergence of HED facilities, such as high-power lasers and fast magnetic pinch machines (Z pinches), allow matter to be placed in extreme states of temperature, density, and velocity [9]. HED laboratory astrophysics includes, for example, experiments on radiative shocks [13][14][15], blast waves launched in atomic cluster media to emulate the ones observed in supernova remnants [16,17], and the formation of jets associated to newly forming stars [18][19][20]. Laboratory experiments have the advantage of being repeatable and that the initial conditions are under control and they also provide data for verification and validation of several aspects of numerical codes such as atomic physics, hydrodynamics, equation of state, and radiative transfer.…”

Section: Introductionmentioning

confidence: 99%

Influence of atomic kinetics in the simulation of plasma microscopic properties and thermal instabilities for radiative bow shock experiments

et al. 2017

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Numerical simulations of laboratory astrophysics experiments on plasma flows require plasma microscopic properties that are obtained by means of an atomic kinetic model. This fact implies a careful choice of the most suitable model for the experiment under analysis. Otherwise, the calculations could lead to inaccurate results and inappropriate conclusions. First, a study of the validity of the local thermodynamic equilibrium in the calculation of the average ionization, mean radiative properties, and cooling times of argon plasmas in a range of plasma conditions of interest in laboratory astrophysics experiments on radiative shocks is performed in this work. In the second part, we have made an analysis of the influence of the atomic kinetic model used to calculate plasma microscopic properties of experiments carried out on MAGPIE on radiative bow shocks propagating in argon. The models considered were developed assuming both local and nonlocal thermodynamic equilibrium and, for the latter situation, we have considered in the kinetic model different effects such as external radiation field and plasma mixture. The microscopic properties studied were the average ionization, the charge state distributions, the monochromatic opacities and emissivities, the Planck mean opacity, and the radiative power loss. The microscopic study was made as a postprocess of a radiative-hydrodynamic simulation of the experiment. We have also performed a theoretical analysis of the influence of these atomic kinetic models in the criteria for the onset possibility of thermal instabilities due to radiative cooling in those experiments in which small structures were experimentally observed in the bow shock that could be due to this kind of instability.

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Experimental Studies of Magnetically Driven Plasma Jets

Cited by 20 publications

References 12 publications

Observation of energetic protons trapped in laboratory magnetic-tower jets

Observation of energetic protons trapped in laboratory magnetic-tower jets

Computational extended magneto-hydrodynamical study of shock structure generated by flows past an obstacle

Influence of atomic kinetics in the simulation of plasma microscopic properties and thermal instabilities for radiative bow shock experiments

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