Contrasting physics in wire array z pinch sources of 1-20 keV emission on the Z facility

Autor: J. Reneker, A. L. Velikovich, J. C. Cisneros, M. P. Vigil, Mark E. Savage, Mark Herrmann, W. A. Sygar, J. P. Apruzese, G. S. Dunham, M. Cleveland, Y.-K. Chong, G. R. McKee, J. W. Thornhill, M. Wu, S. Toledo, C. R. Ball, M. A. Sullivan, M. R. Lopez, N. Ouart, M. E. Cuneo, J. L. Giuliani, D. J. Ampleford, Christopher Jennings, N. W. Moore, N. B. Huynh, E. W. Breden, Daniel Sinars, A. J. York, A. Dasgupta, T. Strizic, D. Sandoval, John L. Porter, Gregory Rochau, M. D. Kernahan, A. D. Edens, C. A. Coverdale, D. W. Justus, T. C. Wagoner, K. L. Killebrew, A. L. Carlson, T. D. Mulville, G. Olivas, C. Cox, Derek C. Lamppa, D. S. Nielsen, M. C. Jones, A. J. Harvey-Thompson, L. P. Molina, S. B. Hansen, E. C. Harding, A. J. Maurer, P. W. Lake, G. Robertson, C. S. Speas, D. A. Graham, Brent Manley Jones, R. Focia, T. M. Flanagan, A. R. Laspe, F. W. Long, R. D. Scharberg, J. K. Moore
Rok vydání: 2014
Předmět:
Zdroj: Physics of Plasmas. 21:056708
ISSN: 1089-7674
1070-664X
DOI: 10.1063/1.4876621
Popis: Imploding wire arrays on the 20 MA Z generator have recently provided some of the most powerful and energetic laboratory sources of multi-keV photons, including ∼375 kJ of Al K-shell emission (hν ∼ 1–2 keV), ∼80 kJ of stainless steel K-shell emission (hν ∼ 5–9 keV) and a kJ-level of Mo K-shell emission (hν ∼ 17 keV). While the global implosion dynamics of these different wire arrays are very similar, the physical process that dominates the emission from these x-ray sources fall into three broad categories. Al wire arrays produce a column of plasma with densities up to ∼3 × 1021 ions/cm3, where opacity inhibits the escape of K-shell photons. Significant structure from instabilities can reduce the density and increase the surface area, therefore increase the K-shell emission. In contrast, stainless steel wire arrays operate in a regime where achieving a high pinch temperature (achieved by thermalizing a high implosion kinetic energy) is critical and, while opacity is present, it has less impact on the pinch...
Databáze: OpenAIRE
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