Particle-in-cell simulations of collisionless shock formation via head-on merging of two laboratory supersonic plasma jets

We describe numerical simulations, using the particle-in-cell (PIC) and hybrid-PIC code lsp [T. P. Hughes et al., Phys. Rev. ST Accel. Beams 2, 110401 (1999)], of the head-on merging of two laboratory supersonic plasma jets. The goals of these experiments are to form and study astrophysically releva...

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Veröffentlicht in:Physics of plasmas 2013-08, Vol.20 (8)
Hauptverfasser: Thoma, C., Welch, D. R., Hsu, S. C.
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Hsu, S. C.
description We describe numerical simulations, using the particle-in-cell (PIC) and hybrid-PIC code lsp [T. P. Hughes et al., Phys. Rev. ST Accel. Beams 2, 110401 (1999)], of the head-on merging of two laboratory supersonic plasma jets. The goals of these experiments are to form and study astrophysically relevant collisionless shocks in the laboratory. Using the plasma jet initial conditions (density ∼1014–1016 cm−3, temperature ∼ few eV, and propagation speed ∼20–150 km/s), large-scale simulations of jet propagation demonstrate that interactions between the two jets are essentially collisionless at the merge region. In highly resolved one- and two-dimensional simulations, we show that collisionless shocks are generated by the merging jets when immersed in applied magnetic fields (B∼0.1–1 T). At expected plasma jet speeds of up to 150 km/s, our simulations do not give rise to unmagnetized collisionless shocks, which require much higher velocities. The orientation of the magnetic field and the axial and transverse density gradients of the jets have a strong effect on the nature of the interaction. We compare some of our simulation results with those of previously published PIC simulation studies of collisionless shock formation.
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At expected plasma jet speeds of up to 150 km/s, our simulations do not give rise to unmagnetized collisionless shocks, which require much higher velocities. The orientation of the magnetic field and the axial and transverse density gradients of the jets have a strong effect on the nature of the interaction. 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subjects 70 PLASMA PHYSICS AND FUSION TECHNOLOGY
ASTROPHYSICS
COMPARATIVE EVALUATIONS
Computer simulation
COMPUTERIZED SIMULATION
Density
ELECTRON TEMPERATURE
HYDROGEN
I CODES
ION TEMPERATURE
Jets
MAGNETIC FIELDS
Merging
NUMERICAL ANALYSIS
Particle in cell technique
PLASMA DENSITY
PLASMA JETS
PLASMA SIMULATION
SHOCK WAVES
Simulation
TWO-DIMENSIONAL CALCULATIONS
title Particle-in-cell simulations of collisionless shock formation via head-on merging of two laboratory supersonic plasma jets
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