A study of the collisionless interaction of interpenetrating super-Alfv�n plasma flows

Antonov, V. A.; Bashurin, V. P.; Голубев, А. И.; Zhmaĭlo, V. A.; Zakharov, Yu. P.; Orishich, A. M.; Ponomarenko, A. G.; Posukh, V. G.; Снытников, В. Н.

doi:10.1007/bf00919519

Cited by 19 publications

(13 citation statements)

References 5 publications

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“…As shown explicitly by Hewett et al, 19 this electric field in turn accelerates ambient ions that, from the resulting E Â B drift, begin moving radially in a quarter gyroperiod. As a result, in the radial direction the magnetic field impedes the piston ions while accelerating the ambient ions and steepening the leading edge of the magnetic compression pulse, as seen in previous experiments 5 and numerical simulations. 21 Anomalous collisionless couplings, 20 such as through the modified or ion-ion two-stream instabilities, are unlikely to be the main coupling mechanism since, because of finite beta effects, 22 they are either not excited under these experimental conditions or their growth times are longer than the ambient ion gyroperiod.…”

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confidence: 73%

“…2 Laboratory experiments in the 1960s succeeded in producing strictly perpendicular magnetized collisionless shocks in h-pinches, 3,4 while efforts in the 1980s achieved some success creating perpendicular shocks using lasers. 5 More recently, several authors [6][7][8][9] have demonstrated that through an appropriate scaling of key dimensionless parameters, one can simulate astrophysically relevant collisionless shocks in a laboratory setting using lasers, which has the advantages of affording greater flexibility and control over reproducibility and, where strict fidelity cannot be achieved, of helping to validate computational codes.…”

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confidence: 99%

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Generation of magnetized collisionless shocks by a novel, laser-driven magnetic piston

et al. 2012

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We present experiments on the Trident laser facility at Los Alamos National Laboratory which demonstrate key elements in the production of laser-driven, magnetized, laboratory-scaled astrophysical collisionless shocks. These include the creation of a novel magnetic piston to couple laser energy to a background plasma and the generation of a collisionless shock precursor. We also observe evidence of decoupling between a laser-driven fast ion population and a background plasma, in contrast to the coupling of laser-ablated slow ions with background ions through the magnetic piston. 2D hybrid simulations further support these developments and show the coupling of the slow to ambient ions, the formation of a magnetic and density compression pulses consistent with a collisionless shock, and the decoupling of the fast ions.

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confidence: 73%

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confidence: 99%

Generation of magnetized collisionless shocks by a novel, laser-driven magnetic piston

et al. 2012

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“…They do produce some hydrodynamic effects, such as the Vishniac instability, 22 that may also develop in collisionless systems. Certain experiments in Russia are most relevant here, 23,24 because they did produce collisionless shocks. In these experiments, an expanding, laser-produced plasma drove a shock wave through a plasma produced by a theta pinch.…”

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confidence: 99%

The design of laboratory experiments to produce collisionless shocks of cosmic relevance

Drake

2000

Physics of Plasmas

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Naturally occurring shocks transport energy and accelerate particles throughout the cosmos. The problem of producing collisionless shocks in the laboratory that are of relevance to such cosmic shocks is considered. Such an experiment must meet a number of constraints, several of which can be expressed by algebraic scaling relations. The relations for magnetization, plasma beta, Alfvén Mach number, temperature, magnetic field, and collisionality are described here. Taken together, the limits imposed by these constraints upon possible experiments are specified. The growth of magnetohydrodynamic (MHD) turbulence and the degree of particle acceleration are examined, demonstrating that it is feasible to contemplate studies of such phenomena in the laboratory. Finally, some discussion of how an experiment might meet the other qualitative constraints, and of how a laser might be used to drive the shock, is also included.

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“…6,7 As early as 1964 it was recognized that a laser delivering power densities above 10 10 W/cm 2 could efficiently produce hot plasmas with the bulk of the laser energy mainly deposited into ion kinetic energy. 8 Since then, major advances in laser technology have created a growing area of research utilizing laser-produced plasmas ͑lpp͒ for a broad range of fields, including fusion research, [9][10][11] simulation of exploding supernovae 12,13 and thin film deposition. 14 The experiment presented here centers on the use of a laser to generate rapidly expanding, dense plasmas embedded in a background plasma.…”

Section: Introductionmentioning

confidence: 99%

Currents and shear Alfvén wave radiation generated by an exploding laser-produced plasma: Perpendicular incidence

et al. 2003

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Examples of one plasma expanding into another and the consequent radiation of wave energy are abundant in both nature and the laboratory. This work is an experimental study of the expansion of a dense laser-produced plasma (initially, nlpp/n0≫1) into a magnetized background plasma (n0=2×1012 cm−3) capable of supporting Alfvén waves. The experiments are carried out on the upgraded Large Plasma Device (LAPD) at UCLA [W. Gekelman et al., Rev. Sci. Instrum. 62, 2875 (1991)]. It has been observed that the presence of a background plasma allows laser-plasma charge separation to occur that would otherwise be limited by large ambipolar fields. This charge separation results in the creation of current structures which radiate shear Alfvén waves. The waves propagate away from the target and are observed to become plasma column resonances. Conditions for increased current amplitude and wave coupling are investigated.

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A study of the collisionless interaction of interpenetrating super-Alfv�n plasma flows

Cited by 19 publications

References 5 publications

Generation of magnetized collisionless shocks by a novel, laser-driven magnetic piston

Generation of magnetized collisionless shocks by a novel, laser-driven magnetic piston

The design of laboratory experiments to produce collisionless shocks of cosmic relevance

Currents and shear Alfvén wave radiation generated by an exploding laser-produced plasma: Perpendicular incidence

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