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Spectroscopy and implosion dynamics of low wire number nested arrays on the COBRA generator
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10.1063/1.2888520
/content/aip/journal/pop/15/3/10.1063/1.2888520
http://aip.metastore.ingenta.com/content/aip/journal/pop/15/3/10.1063/1.2888520

Figures

Image of FIG. 1.
FIG. 1.

Mixed Al/SS nested arrays with eight wires in the outer array and four wires in the inner array. Current waveforms, PCD signals (filtered through Be), and x-ray time-gated images (left upper corner) with the locations of the MCP frames (at the top).

Image of FIG. 2.
FIG. 2.

Mixed SS/Al nested arrays with eight wires in the outer array and four wires in the inner array: (a) Current waveforms, PCD signals (filtered through Be), and x-ray time-gated images (left upper corner) with the locations of the MCP frames (at the top). (b) Laser shadowgraphy images of the implosions. Time is counted from the start of the current.

Image of FIG. 3.
FIG. 3.

Uniform Al nested arrays with eight wires in the outer array and four (shots 450, 452, and 455) or eight (shot 456) wires in the inner array. Current waveforms, PCD signals (filtered through Be), and x-ray time-gated images (left upper corner) with the locations of the MCP frames (at the top). (b) Laser shadowgraphy images of the implosions. Time is counted from the start of the current.

Image of FIG. 4.
FIG. 4.

Uniform SS nested arrays with eight wires in the outer array and four (shot 461) or eight (shot 460) wires in the inner array. Current waveforms, PCD signals (filtered through ), and x-ray time-gated images (left upper corner) with the locations of the MCP frames (at the top).

Image of FIG. 5.
FIG. 5.

Implosion dynamics of the nested wire array of shot 459 according to the wire dynamics model. The wire implosion trajectories and the values of the electric current through wires are shown in plots (a) and (b), respectively, for the anticlock and clock wires of the outer array and for wires of the inner array. Plot (c) shows the timing and the amount of thermalized kinetic energy due to the “interaction pulse” (IP), “inner strike” (IS), and the main pulse (MP). The experimental x-ray pulse (broken line, arbitrary units, PCD signal) and the current waveform (thin solid line) are also shown in (c).

Image of FIG. 6.
FIG. 6.

Uniform SS nested array with four wires in the inner array (shot 461). The experimental spectrum (bottom) fit with the theoretical spectrum calculated at and (top), which includes -shell Fe (solid line) and -shell Ni (dotted line) spectra.

Image of FIG. 7.
FIG. 7.

Uniform SS nested array with four wires in the inner array (shot 461). The anode is from brass. X-ray spectra recorded by the spectrometer provide the parameters for the keV plasmas. The resonance line and the satellites to this line of Fe ions originated from hot plasmas near the cathode (gray line at the top) are fit with at (black line at the top). The “cold” characteristic lines from the anode (Zn and Cu) and wire (Fe) materials (gray line at the bottom) are observed near the anode.

Image of FIG. 8.
FIG. 8.

Uniform SS nested wire array with four wires in the inner array (shot 461). (a) Current waveforms, PCD (filtered through ), and EUV signals, and the values of Te (changing between and ) from modeling of TGSI spectra. (b) The image of the experimental x-ray TGSI spectra recorded by six MCP frames and the corresponding lineout from frame with modeling at and . Time is counted from the start of the current.

Image of FIG. 9.
FIG. 9.

Uniform SS nested wire array with eight wires in the inner array (shot 460). (a) Current waveforms, PCD (filtered through ), and EUV signals, and the values of Te (changing between and ) from modeling of TGSI spectra. (b) The image of the experimental x-ray TGSI spectra recorded by six MCP frames and the corresponding lineout from frame with modeling at and . Time is counted from the start of the current.

Image of FIG. 10.
FIG. 10.

Mixed nested arrays from Al and SS. A comparison of the x-ray time-integrated spectra show that -shell Al and Mg lines are more intense when the outer array was from Al (shot 457, SS/Al, top film) whereas -shell Fe lines are more intense when the outer array was from SS (shot 458, Al/SS, bottom film).

Image of FIG. 11.
FIG. 11.

Mixed SS/Al nested array (shot 462). The experimental spectra (bottom) fit with the theoretical -shell Mg (solid line) and Al (dotted line) spectra (a) and -shell Fe (solid black line) and Ni (solid gray line) spectra (b) calculated at and .

Image of FIG. 12.
FIG. 12.

Mixed Al and SS nested wire arrays with four wires in the inner array. Current waveforms, PCD (filtered through ), and EUV signals, and values of Te from modeling of TGSI spectra. (a) Al/SS nested array (shot 459), the values of Te are changing between and ; (b) SS/Al nested array (shot 462), the values of Te are changing between and .

Tables

Generic image for table
Table I.

Loads for nested array experiments with aluminum Al5056 (95% Al, 5% Mg) and stainless steel SS304 (69% Fe, 19% Cr, 9% Ni). The outer array and inner array diameters were 13 and , respectively.

Generic image for table
Table II.

Characteristic features of x-ray bursts in nested wire experiments on COBRA at Cornell University: timing of the precursor (or first nonintense x-ray burst), the main (first or second more intense x-ray burst), and the maximum intensity x-ray bursts with respect to the start of the current and the number of x-ray bursts.

Generic image for table
Table III.

Plasma parameters (Te, Ne) from modeling of time-integrated spectra recorded by a mica crystal and the total radiation yield from implosions of uniform and mixed nested wire arrays. Note that implosions of uniform nested loads produce only one type of radiation, whereas the implosions of mixed nested loads produce both types of radiation.

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/content/aip/journal/pop/15/3/10.1063/1.2888520
2008-03-20
2014-04-17
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Spectroscopy and implosion dynamics of low wire number nested arrays on the 1MA COBRA generator
http://aip.metastore.ingenta.com/content/aip/journal/pop/15/3/10.1063/1.2888520
10.1063/1.2888520
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