Evolution of the structure of the dense plasma near the cross point in exploding wire X pinches
- 1 July 1999
- journal article
- research article
- Published by AIP Publishing in Physics of Plasmas
- Vol. 6 (7), 2840-2846
- https://doi.org/10.1063/1.873241
Abstract
The dynamics of the dense plasma near the cross point of an X pinch has been investigated using 1 ns x-ray backlighting images at different moments relative to the start of 100 ns [full width at half maximum (FWHM)] 200 kA current pulses. If the two metal wires are fine enough (e.g., 10 μm W or 17.5 μm Mo) to form a pinch at the cross point, accompanied by an x-ray burst, with the available current pulse, then the images show three stages of development: a radial explosion/expansion phase; an implosion during which a dense Z pinch of 200–300 μm length forms at the cross point together with plasma jets which move axially away from that point; and a breaking up of the Z pinch, coincident in time with one or two x-ray bursts, after which a 300 μm gap opens up. For W, the backlighter minimum sensitivity is 10 17 / cm 2 areal density, and the dense Z pinch is estimated to have a volume density close to 10 21 / cm 3 . Shock waves appear to be expanding at about 50 μm/ns from the end points of the collapsing Z pinch, where the plasma was the most dense.Keywords
This publication has 5 references indexed in Scilit:
- Studies of plasma formation from exploding wires and multiwire arrays using x-ray backlightingReview of Scientific Instruments, 1999
- Dynamics of thin exploded-wire plasma with a cold dense coreJournal of Experimental and Theoretical Physics, 1998
- Temporal evolution of the hydrodynamic instability of the boundary between the dense core and the plasma corona during nanosecond explosion of wiresJETP Letters, 1998
- High-luminosity monochromatic x-ray backlighting using an incoherent plasma source to study extremely dense plasmas (invited)Review of Scientific Instruments, 1997
- The x-pinch as a point source of x rays for backlightingReview of Scientific Instruments, 1995