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Radiatively-Cooled Magnetic Reconnection Experiments at the Z Pulsed-Power Facility

Hare, Jack; Datta, Rishabh; Sergey, Lebedev; Chittenden, Jerry; Crilly, Aidan; Bland, Simon; Halliday, Jack; Russell, Danny; Fox, Will; Hantao, Ji; Kuranz, Carolyn; Myers, Clayton E.; Aragon, Carlos A.; Jennings, Christopher A.; Ampleford, David A.; Beckwith, Kristian B.; Harding, Eric H.; Hansen, Stephanie B.; Dunham, Gregory S.; Edens, Aaron E.; Gonzalez, Josue; Harmon, Roger L.; Kellogg, Jeffrey W.; Jones, Michael J.; Looker, Quinn M.; Molina, Leo M.; Montoya, Michael L.; Patel, Sonal P.; Loisel, Guillaume P.; Speas, Christopher S.; Webb, Timothy J.; Yager-Elorriaga, David A.; Shipley, Gabriel A.; Chandler, Katherine

Abstract not provided.

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TYPE Conference Presenation YEAR 2022
DOIOSTI

Domination of the K-Radiation at a Z-Pinch Stagnation on Z by Numerous Tiny Spots and the Properties of the Spots Inferred by Experimental Determination of the K-Line Opacities

IEEE International Conference on Plasma Science

Maron, Y.; Bernshtam, V.; Zarnitsky, Y.; Fisher, V.; Nedostup, O.; Ampleford, David A.; Jennings, Christopher A.; Jones, Brent M.; Cuneo, M.E.; Rochau, G.A.; Dunham, Gregory S.; Loisel, Guillaume P.

Detailed analysis of both the line-intensity ratios and line shapes of the K-lines of elements of different abundances (Fe, Cr, Ni, and Mn) emitted from the stagnation of a steel wire-array implosion on Z, were used to determine the line opacities. While the opacities at the early time of stagnation appear to be consistent with a nearly uniform hot-plasma cylinder on-axis surrounded by a colder annulus, the opacities during the peak K-emission strongly suggest that the main K-emission is due to small hot regions (spots) spread over the stagnating column. The spots are shown to be at least 4× denser than expected based on a uniform-cylinder emission (namely, ni > 3 ×1020 cm-3 ), are of diameters of about 200 μ or less (where the smaller the spots the higher are the densities), and are thousands in number. The total mass of the spots was determined to be 3-10 % of the load mass, and their total volume 3-15 % of the O 1.2-mm stagnation-column volume, both are less than the respective values for the earlier period of lower K power.

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TYPE Conference Presenation YEAR 2022
DOIOSTIScopus

Background measurement methods for opacity experiments conducted at the Z facility

Review of Scientific Instruments

Dunham, Gregory S.; Nagayama, Taisuke N.; Bailey, James E.; Loisel, Guillaume P.

Laboratory experiments typically test opacity models by measuring spectrally resolved transmission of a sample using bright backlight radiation. A potential problem is that any unaccounted background signal contaminating the spectrum will artificially reduce the inferred opacity. Methods developed to measure background signals in opacity experiments at the Sandia Z facility are discussed. Preliminary measurements indicate that backgrounds are 9%-11% of the backlight signal at wavelengths less than 10 Å. Background is thus a relatively modest correction for all Z opacity data published to date. Future work will determine how important background is at longer wavelengths.

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TYPE Journal Article YEAR 2021
DOIOSTIScopusDOIOSTIScopus
Results 1–25 of 120
Results 1–25 of 120