Supersonic jet formation and propagation in x-pinches

Details Supersonic jet formation and propagation in x-pinches Supersonic jet formation and propagation in x-pinches

Nov 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011ap%26ss.336...33h&link_type=abstract

Astrophysics and Space Science, Volume 336, Issue 1, pp.33-40

Astronomy and Astrophysics

Astrophysics

X-Pinch, Jets, Supersonic Outflows

Scientific paper

Observations of supersonic jet propagation in low-current x-pinches are reported. X-pinches comprising of four 7.5 μm diameter tungsten wires were driven by an 80 kA, 50 ns current pulse from a compact pulser. Coronal plasma surrounding the wire cores was accelerated perpendicular to their surface due to the global J× B force, and traveled toward the axis of the x-pinch to form an axially propagating jet. These jets moved towards the electrodes and, late in time (˜150 ns), were observed to propagate well above the anode with a velocity of 3.3±0.6×104 m/s. Tungsten jets remained collimated at distances of up to 16 mm from the cross point, and an estimate of the local sound speed gives a Mach number of ˜6. This is the first demonstration that supersonic plasma jets can be produced using x-pinches with such a small, low current pulser. Experimental data compares well to three-dimensional simulations using the GORGON resistive MHD code, and possible scaling to astrophysical jets is discussed.

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