X-ray absorption spectroscopy for wire-array Z-pinches at the non-radiative stage
| Autor: | O. Dmitriev, O. Chalyy, S. D. Altemara, Jerry Chittenden, T. Durmaz, A. L. Astanovitskiy, Roberto Mancini, Daniel Papp, P. Wiewior, Alexander P. Shevelko, A. A. Anderson, V. V. Ivanov, Peter Hakel, Vidya Nalajala |
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| Rok vydání: | 2011 |
| Předmět: |
Nuclear and High Energy Physics
Radiation Materials science Absorption spectroscopy Spectrometer Extended X-ray absorption fine structure business.industry Astrophysics::High Energy Astrophysical Phenomena Laser Spectral line law.invention Optics law Z-pinch Radiative transfer Electron temperature Atomic physics business |
| Zdroj: | High Energy Density Physics. 7:383-390 |
| ISSN: | 1574-1818 |
| Popis: | Absorption spectroscopy was applied to wire-array Z-pinches on the 1 MA pulsed-power Zebra generator at the Nevada Terawatt Facility (NTF). The 50 TW Leopard laser was coupled with the Zebra generator for X-ray backlighting of wire arrays at the ablation stage. Broadband X-ray emission from a laser-produced Sm plasma was used to backlight Al star wire arrays in the range of 7–9 A. Two time-integrated X-ray conical spectrometers recorded reference and absorption spectra. The spectrometers were shielded from the bright Z-pinch X-ray burst by collimators. The comparison of plasma-transmitted spectra with reference spectra indicates absorption lines in the range of 8.1–8.4 A. Analysis of Al K-shell absorption spectra with detailed atomic kinetics models shows a distribution of electron temperature in the range of 10–30 eV that was fitted with an effective two-temperature model. Temperature and density distributions in wire-array plasma were simulated with a three-dimension magneto-hydrodynamic code. Post-processing of this code’s output yields synthetic transmission spectrum which is in general agreement with the data. |
| Databáze: | OpenAIRE |
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