Mitigation of the Plasma-Implosion Inhomogeneity in Starlike Wire-Array<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>Z</mml:mi></mml:math>Pinches

Иванов, В. В.; Sotnikov, V. I.; Haboub, A.; Shevelko, A. P.; Astanovitskiy, A. L.; Morozov, A. A.; Казаков, Е. Д.; Altemara, S. D.

doi:10.1103/physrevlett.100.025004

Cited by 28 publications

(22 citation statements)

References 19 publications

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“…Bright spots in the star wire arrays are better synchronized compared to the planar array, presumably due to the mitigation of implosion instabilities. 33 This provides a shorter x-ray pulse. Typically, bright spots in streak images do not demonstrate motion in the axial direction.…”

Section: Resultsmentioning

confidence: 99%

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Study of micro-pinches in wire-array Z pinches

et al. 2013

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Bright and hot areas with a high plasma density and temperature are observed in all kinds of Z pinches. We studied bright radiating spots produced by micro-pinches in cylindrical and planar wire-arrays at the 1 MA Zebra pulsed power generator using an x-ray streak camera synchronized with laser diagnostics, x-ray time-gated pinhole camera, and spectroscopy. Hot spots with extremely dense and relatively hot plasma arise during the collapse of the micro-pinches. These hot spots radiate a continuum spectrum with energy >2.5 keV. Typical micro-pinches in Al wire arrays generate x-ray bursts with durations of 0.4-1 ns in the soft x-ray range and 0.1-0.4 ns in the keV range. UV two-frame shadowgraphy shows spatial correlation of hot spots with the collapse and explosion of micro-pinches. Micro-pinches typically occur at the necks of the Z pinch, but can demonstrate a variety of parameters and different dynamics. An analysis of x-ray streak images shows that micro-pinches can generate >20% of the x-ray energy in some types of wire-array Z pinches. V C 2013 AIP Publishing LLC. [http://dx.

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Section: Resultsmentioning

confidence: 99%

“…These loads were used for the investigation of hot spots. The radiation dynamics of the stagnated Z pinch was also studied in star wire arrays 33 and cylindrical arrays of 8 mm.…”

Section: -2mentioning

confidence: 99%

Study of micro-pinches in wire-array Z pinches

et al. 2013

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“…Star wire arrays had the best demonstrated pulse-shape reproducibility on the Zebra generator. 41 As the dynamics of the closely spaced load is different from that in cylindrical array, no unambiguous conclusion can be made on the effect of the precursor. 8-wire and 16-wire arrays cannot be compared for the same reason.…”

Section: B X-ray Radiation Characteristics Of Closely Spaced Arraysmentioning

confidence: 96%

“…The ablation-implosion process in closely spaced nested arrays is the hydrodynamic collision mode, 2,26 and shows cascading features similar to star arrays. [39][40][41] Details of the ablation were revealed by 2-frame 266 nm UV probing, which penetrated into plasma opaque to regular 532 nm laser probing. This allowed the resolution of breaks in the wire cores, which were not visible at 532 nm first, while the inner wires still ablate (Fig.…”

Section: A Nonprecursor and Precursor Implosion In Closely Spaced Nementioning

confidence: 99%

Study of the precursor and non-precursor implosion regimes in wire array Z-pinches

et al. 2012

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Star-like and closely spaced nested wire array configurations were investigated in precursor and non-precursor implosions. Closely spaced nested cylindrical arrays have inner and outer arrays with equal wire numbers, and inner and outer wires aligned to each other. The gap between the outer and inner wires is not more than 1 mm. Calculation of magnetic fields shows that the small gap results in a reversed, outward j Â B force on the inner wires. Closely spaced arrays of 6-16 wires with outer diameter of 16 mm and with gaps of DR ¼ 0.25-1 mm were tested. 6-8-wire arrays with a gap of DR ¼ 0.4-1 mm imploded without precursor, but precursor was present in loads with 12-16 wires and DR ¼ 0.25-1 mm. Implosion dynamics of closely spaced arrays was similar to that of star-like arrays. Implosion time was found to decrease with decreased wire numbers. Star array configurations were designed with a numerical scheme to implode with or without precursor. The lack of precursor resulted in a marginal improvement in total x-ray yield and power, and up to 20% increase in Al K-shell yield. The Al K-shell radiated energy was found to increase with decreasing the number of arrays in closely spaced and star-like wire arrays. V C 2012 American Institute of Physics. [http://dx.

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“…A new type of "star"-like wire array was developed recently [6]. Triple and quadruple low wire-number arrays produced an enhanced X-ray power that was linked to the mitigation of plasma instabilities.…”

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confidence: 99%