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Production of radiatively cooled hypersonic plasma jets and links to astrophysical jets

S V Lebedev1, A Ciardi1,2, D J Ampleford1, S N Bland1, S C Bott1, J P Chittenden1, G N Hall1, J Rapley1, C Jennings1, M Sherlock1, A Frank3,4 and E G Blackman3,4

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We present results of high energy density laboratory experiments on the production of supersonic radiatively cooled plasma jets with dimensionless parameters (Mach number ~30, cooling parameter ~1 and density contrast ρja ~ 10) similar to those in young stellar objects jets. The jets are produced using two modifications of wire array Z-pinch driven by 1 MA, 250 ns current pulse of MAGPIE facility at Imperial College, London. In the first set of experiments the produced jets are purely hydrodynamic and are used to study deflection of the jets by the plasma cross-wind, including the structure of internal oblique shocks in the jets. In the second configuration the jets are driven by the pressure of the toroidal magnetic field and this configuration is relevant to the astrophysical models of jet launching mechanisms. Modifications of the experimental configuration allowing the addition of the poloidal magnetic field and angular momentum to the jets are also discussed. We also present three-dimensional resistive magneto-hydrodynamic simulations of the experiments and discuss the scaling of the experiments to the astrophysical systems.


PACS

95.30.Qd Magnetohydrodynamics and plasmas

52.55.-s Magnetic confinement and equilibrium

95.30.Lz Hydrodynamics

52.58.Lq Z-pinches, plasma focus and other pinch devices

Subjects

Fluid dynamics

Plasma physics

Astrophysics and astroparticles

Dates

Issue 12B (December 2005)

Received 1 July 2005

Published 8 November 2005



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