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Study of X-pinch dynamics using a low current (25 kA) and slower current (400 ns) pulse
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10.1063/1.4798389
/content/aip/journal/pop/20/4/10.1063/1.4798389
http://aip.metastore.ingenta.com/content/aip/journal/pop/20/4/10.1063/1.4798389
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

Typical pulsed-power setup with SF6 switch hemispheres and sample short-circuit post.

Image of FIG. 2.
FIG. 2.

Integrated dI/dt signals from a short circuit and an actual X-pinch load.

Image of FIG. 3.
FIG. 3.

Filter transmission curves for 3 μm Cu, 10 μm Al, and 2 × 3.5 μm AlMy.

Image of FIG. 4.
FIG. 4.

(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.

Image of FIG. 5.
FIG. 5.

(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.

Image of FIG. 6.
FIG. 6.

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.

Image of FIG. 7.
FIG. 7.

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.

Image of FIG. 8.
FIG. 8.

(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.

Image of FIG. 9.
FIG. 9.

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.

Image of FIG. 10.
FIG. 10.

(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.

Image of FIG. 11.
FIG. 11.

(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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/content/aip/journal/pop/20/4/10.1063/1.4798389
2013-04-15
2014-04-16
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Study of X-pinch dynamics using a low current (25 kA) and slower current (400 ns) pulse
http://aip.metastore.ingenta.com/content/aip/journal/pop/20/4/10.1063/1.4798389
10.1063/1.4798389
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