Modeling of K-shell Al and Mg radiation from compact single, double planar and cylindrical alloyed Al wire array plasmas produced on the 1 MA Zebra generator at UNR

Yilmaz, M.F.; Safronova, A.S.; Kantsyrev, V.L.; Esaulov, A. A.; Williamson, K.; Shrestha, I.; Weller, M. E.; Osborne, G. C.; Shlyaptseva, V. V.

doi:10.1016/j.hedp.2011.10.002

Cited by 9 publications

(5 citation statements)

References 19 publications

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“…4 (d) and (c), respectively. Firstly, K-shell Al radiation has different radiative signatures from what is usually observed for Al PWAs: it radiates from chain of bright spots and not as a column, 11 and the K-shell Al lines are optically thin. The latter is confirmed by not only the very narrow shape of the lines but by the absence of K-shell Mg lines, which are signatures of opacity effects in K-shell plasma from alloyed Al 5056 (95% Al and 5% Mg) and are frequently used as the diagnostics of opacity.…”

Section: Single Planar Wire Arraysmentioning

confidence: 93%

“…The latter is confirmed by not only the very narrow shape of the lines but by the absence of K-shell Mg lines, which are signatures of opacity effects in K-shell plasma from alloyed Al 5056 (95% Al and 5% Mg) and are frequently used as the diagnostics of opacity. 11 The absence of K-shell Mg lines and therefore existence of only optically thin Al lines could not be explained either by the small mass of Al (it is about 29% of the total load mass and is close to the mass of tested Al SPWAs) nor by the angle of observation by the time integrated spatially resolved spectrometer (side-on from the left as shown in Fig. 4b).…”

Section: Single Planar Wire Arraysmentioning

confidence: 94%

“…Since 2005, radiative and implosion characteristics of Planar Wire Arrays (PWA), the novel wire array loads tested and developed on Zebra at UNR, have been extensively studied [1][2][3][5][6][7][8][9][10][11] . In particular, compact, mm-scale, PWAs demonstrated largest resistive energy (>30 kJ/cm) and power (>1 TW/cm) gain among all tested at university-scale generators (at peak current 1-2 MA) and turned out to be effective radiators, even though the physical mechanism of efficient magnetic energy conversion into radiation still remains unclear.…”

Section: Radiative Signatures Of Planar Wire Arraysmentioning

confidence: 99%

“…The experiments with X-pinch, cylindrical, nested, and various types of the novel load, Planar Wire Array (PWA) were performed on Zebra generator. [1][2][3][4][5][6][7][8][9][10][11][12] The Zebra generator is a 100 ns rise time, 1 MA current, 1.92 Ω pulsed power generator located at UNR. The total energy stored in the Marx bank was about 150 kJ.…”

Section: Introductionmentioning

confidence: 99%

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Radiative signatures of Z-pinch plasmas at UNR: from X-pinches to wire arrays

Safronova

Kantsyrev

Esaulov

et al. 2014

Int. J. Mod. Phys. Conf. Ser.

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University-scale Z-pinch generators are able to produce High Energy Density (HED) plasmas in a broad range of plasma parameters under well-controlled and monitored experimental conditions suitable for radiation studies. The implosion of X-pinch and wire array loads at a 1 MA generator yields short (1-20 nsec) x-ray bursts from one or several bright plasma spots near the wire cross point (for X-pinches) or along and near Z-pinch axis (for wire arrays). Such X- and Z-pinch HED plasma with scales from a few µm to several mm in size emits radiation in a broad range of energies from 10 eV to 0.5 MeV and is subject of our studies during the last ten years. In particular, the substantial number of experiments with very different wire loads was performed on the 1 MA Zebra generator and analyzed: X-pinch, cylindrical, nested, and various types of the novel load, Planar Wire Arrays (PWA). Also, the experiments at an enhanced current of 1.5-1.7 MA on Zebra using Load Current Multiplier (LCM) were performed. This paper highlights radiative signatures of X-pinches and Single and Double PWAs which are illustrated using the new results with combined wire loads from two different materials.

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Section: Single Planar Wire Arraysmentioning

confidence: 93%

Section: Single Planar Wire Arraysmentioning

confidence: 94%

Section: Radiative Signatures Of Planar Wire Arraysmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Radiative signatures of Z-pinch plasmas at UNR: from X-pinches to wire arrays

Safronova

Kantsyrev

Esaulov

et al. 2014

Int. J. Mod. Phys. Conf. Ser.

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“…The rest of this section goes over the experimental results of the temporal dynamics of the TPWAs with a 1.5 mm inter-planar gap in order to better understand how the different configurations implode and also how K-shell Al radiates in time. [12]). The ratio of Al2 (Lyα: 2p 2 P 1/2,3/2 → 1s 2 S 1/2 ) to Al1 (Heα: 1s2p 1 P 1 → 1s 2 1 S 0 ) is used to estimate T e with an uncertainty of ± 10%.…”

Section: Combined With Al Tpwasmentioning

confidence: 99%

Temporal characteristics and radiative properties of uniform Mo and combined with Al triple planar wire arrays

Weller

Safronova

Kantsyrev

et al. 2015

High Energy Density Physics

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Results of the research with triple planar wire arrays (TPWAs) made of uniform Mo or from combined Mo and Al planes obtained on the University of Nevada, Reno (UNR) Zebra generator are presented. The combined loads consisted of either two Mo planes on the outside with Al in the center or two Al planes on the outside with Mo in the center. Different wire diameters of Mo and Al were used to keep the planes approximately the same mass Also, the change of inter-planar gap was investigated: decreasing the interplanar gap from 3.0 mm to 1.5 mm led to a higher yield of 25 kJ (up from 16 kJ), close to the highest yield from Mo double planar wire arrays. The question of how Mo and Al plasmas mix is raised and is examined and as a result it is demonstrated that L-shell Mo (~1000 eV) and K-shell Al (~400 eV) plasmas have very different electron temperatures. Additionally, time-gated K-shell Al and Mg plasma parameters were modeled, giving important information on the time-evolution of such plasmas. The future work on radiation from mixed higher and lower atomic number wire arrays is discussed.

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