Implosion dynamics and K-shell x-ray generation in large diameter stainless steel wire array Z pinches with various nesting configurations
| Autor: | Christine Anne Coverdale, P. David Lepell, David J. Ampleford, J. Ward Thornhill, Eduardo Waisman, Arati Dasgupta, K.G. Whitney, Kyle Robert Cochrane, John P. Apruzese, Jeremy Chittenden, Christopher Deeney, Michael Edward Cuneo, Daniel Sinars, Brent Manley Jones, Robert W. Clark |
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| Rok vydání: | 2008 |
| Předmět: | |
| Zdroj: | Physics of Plasmas. 15:122703 |
| ISSN: | 1089-7674 1070-664X |
| Popis: | Nested stainless steel wire array variations were investigated on the 20MA Z machine [R. B. Spielman et al., Phys. Plasmas 5, 2105 (1998)]. In order to reach experimentally observed electron temperatures near 3.8keV and excite the K shell, these ∼6.7keV photon energy x-ray sources must be of large initial diameter (45–80mm) which poses a concern for magnetic Rayleigh–Taylor instability growth. We discuss the implosion dynamics in these large diameter wire arrays, including an analysis of the ablation phase indicating that the prefill material is snowplowed at large radius. Nested array configurations with various mass and radius ratios are compared for instability mitigation and K-shell scaling. Degradation of the K-shell x-ray power and yield was observed for shots that did not have simultaneous implosion of the outer and inner wire arrays. Shots that were designed per this constraint exhibited K-shell yield scaling consistent with the model of J. W. Thornhill et al. [IEEE Trans. Plasma Sci. 34, 2377 (20... |
| Databáze: | OpenAIRE |
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