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Implosion dynamics and radiation characteristics of wire-array Z pinches on the Cornell Beam Research Accelerator
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10.1063/1.3054537
/content/aip/journal/pop/16/1/10.1063/1.3054537
http://aip.metastore.ingenta.com/content/aip/journal/pop/16/1/10.1063/1.3054537

Figures

Image of FIG. 1.
FIG. 1.

Thirty-two-wire W array on an array diameter giving wire spacing (wire diameters are ; array height is ). The anode plate (above the array) and four return current posts (surrounding the array) are shown in (a).

Image of FIG. 2.
FIG. 2.

Visible-light streak camera image synchronized to various signals for a 16-wire W array on an array diameter, with wire spacing, wire diameters, and .

Image of FIG. 3.
FIG. 3.

Time-gated XUV images (top row) and laser shadowgraph images (bottom row) of imploding 32-wire W arrays with array diameters, wire spacings, wire diameters, and . Frame times are relative to stagnation on the visible streak images.

Image of FIG. 4.
FIG. 4.

Visible-light streak camera image synchronized to various signals for a 32-wire W array on an array diameter, with wire spacing, wire diameters, and .

Image of FIG. 5.
FIG. 5.

Visible-light streak camera image synchronized to various signals for a 16-wire W array on a array diameter, with wire spacing, wire diameters, and .

Image of FIG. 6.
FIG. 6.

Time-gated XUV images (top row) and laser shadowgraph images (bottom row) of imploding 16-wire W arrays with array diameters, wire spacings, wire diameters, and . Frame times are relative to stagnation on the visible streak images.

Image of FIG. 7.
FIG. 7.

Visible-light streak camera image synchronized to various signals for a 16-wire Al array on a array diameter, with wire spacing, wire diameters, and .

Image of FIG. 8.
FIG. 8.

Visible-light streak camera image synchronized to various signals for a 32-wire Al array on an array diameter, with wire spacing, wire diameters, and .

Image of FIG. 9.
FIG. 9.

Visible-light streak camera image synchronized to various signals for a 16-wire Al array on a array diameter, with wire spacing, wire diameters, and .

Image of FIG. 10.
FIG. 10.

Time-gated XUV images (top row) and laser shadowgraph images (bottom row) of imploding 32-wire Al arrays with array diameters, wire spacings, wire diameters, and . Frame times are relative to stagnation on the visible streak images.

Image of FIG. 11.
FIG. 11.

Visible-light streak camera image synchronized to various signals for an eight-wire Invar array on a array diameter, with wire spacing, wire diameters, and .

Image of FIG. 12.
FIG. 12.

Time-gated XUV images of an imploding eight-wire Invar array on a array diameter, with wire spacing, wire diameters, and . Frame times are relative to stagnation on the visible streak image.

Image of FIG. 13.
FIG. 13.

XUV images of W arrays revealing the presence of unstable precursor columns, suggesting a significant amount of current advection to the precursors. The wire spacings in (a) were and in (b) it was (i.e., greater than the threshold described in the text). Part (b) also shows the similarity between the shape of the precursor column and the shape of the stagnation column . Frame times are relative to stagnation on the visible streak images.

Image of FIG. 14.
FIG. 14.

Implosion trajectories produced by the thin-shell, ablation-snowplow, and inductance unfold models for the 32-wire W (a) and Al (b) arrays of Secs. ??? and III B, respectively. Both were on array diameters and had wire spacings. The wire diameters were for W and for Al, giving them and , respectively.

Image of FIG. 15.
FIG. 15.

Time-integrated, unfiltered, pinhole images of imploding arrays for W, Al, and Invar, all revealing the presence of localized hot spots. The first layer of film (DR50) filters wide-spread soft radiation, while the second film (Biomax®) typically shows the localized hot spots with greater contrast.

Image of FIG. 16.
FIG. 16.

Time-integrated x-ray spectra with vertical and horizontal spatial resolution produced by the WB-FSSR, and revealing the continuum nature of the localized hot spots for W, Al, and Invar.

Image of FIG. 17.
FIG. 17.

X-ray streak camera image of the top half of the pinch axis of an Invar array revealing the formation of discrete hot spots at various times and locations.

Image of FIG. 18.
FIG. 18.

Two time-gated XUV frames and their timings relative to various signals for an Al implosion. The very fast spikelike burst at the beginning of this particular x-ray pulse (which occurs rarely) is similar to the fast pulses produced by X pinches. The XUV frames show two dominant micropinch regions—one halfway up the array and one at the bottom/cathode end of the array. The later XUV frame shows that these two neck-down regions have opened up after the fast initial x-ray burst, forming mini-diode-like gaps. The onset of electron-beam detection by the Faraday cup occurs at a time between these two frames (likely at the time when the neck-down regions first begin to open), suggesting that the energetic electrons detected are the result of electron acceleration across these mini-diode-like gaps. The vertical positions of these micropinch regions correspond to the vertical positions of continuum on the WB-FSSR images and to the vertical positions of bright spots on time-integrated pinhole camera images.

Tables

Generic image for table
Table I.

Wire-array configurations tested (all tall).

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/content/aip/journal/pop/16/1/10.1063/1.3054537
2009-01-29
2014-04-16
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Implosion dynamics and radiation characteristics of wire-array Z pinches on the Cornell Beam Research Accelerator
http://aip.metastore.ingenta.com/content/aip/journal/pop/16/1/10.1063/1.3054537
10.1063/1.3054537
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