Typical pulsed-power setup with SF6 switch hemispheres and sample short-circuit post.
Integrated dI/dt signals from a short circuit and an actual X-pinch load.
Filter transmission curves for 3 μm Cu, 10 μm Al, and 2 × 3.5 μm AlMy.
(a) shows a leg on the anode side of anX-pinch. (b) shows an interferogram unfold of thearea surrounding the wire. Both the wire and the area directly to the interior of the wire exhibit slight density modulations which may be ablation flares. Both frames are 280 ns after current start and at the time of X-ray emission.
(a) shows a micro z-pinch within ±2.5 ns of X-ray emission, while (b) shows the same area 20 ns later, with the area formerly occupied by dense plasma now completely empty.
Sequence of 2-wire 5 μm W X-pinches with times relative to current start (times relative to X-ray emission in parenthesis). The anode end is at the bottom of each frame.
Sequence of 4-wire 5 μm W X-pinches with times relative to current start (times relative to emission in parenthesis). The anode end is at the bottom of each frame.
(a) shows the diode signals from a 2-wire 5 μm W X-pinch. The 2 × 3.5 μm aluminized Mylar filtered diode signal is saturated. Smaller signals sporadically appear on the 3 μm Cu and 10 μm Al filtered diodes. (b) shows an 2 × 3.5 μm aluminized Mylar diode signal from a 4-wire 5 μm W X-pinch. The signal width measures 12 ns at FWHM.
An unfolded interferogram of a gap formation 30 ns after pinching with lines showing how the measurements for the plasma electrode and plasma column gaps were taken.
(a) shows the gap measurements for the plasma-electrodes and the plasma column tails for the 2-wire X-pinch shots. The dashed lines are linear fits applied to the data points, from which the respective expansion rate is derived. (b) shows the gap measurements for the plasma-electrodes and the plasma column tails for the 4-wire X-pinch shots. The dashed lines are linear fits.
(a) shows a well-defined shock structure traveling down the axial column of a 4-wire 5 μm W X-pinch at 123 ns after X-ray emission began and (b) shows the 20 ns delay interferogram from the same shot as (a). The rates of gap expansion at the column base and the rate of shock propagation differ dramatically. The images show the anode half of the X-pinches.
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