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ABSTRACT: The dynamics of the implosion of a deuterium-filled microsphere has been investigated via the detailed analysis of the ArXVII 1s2–1s3p1P line shape. Ar is doped into the deuterium core for diagnostic purposes. For the analysis calculations of ArXVII 1–3 line shape including lithium-like dielectronic satellites were compared with time-resolved data. Three fitting parameters were used: (a) electron temperature, (b) electron density, and (c) relative shift of the wavelength axis between calculation and data. The temporal evolution of the core electron temperature and density were derived, and the shot-to-shot formation of the core plasma was shown to be reliable and reproducible. We report on the wavelength shift of the ArXVII 1s2–1s3p1P line shape between electron densities of 1023–, results indicate a systematic red shift with increasing density.
Journal of Quantitative Spectroscopy and Radiative Transfer 04/2000; 65(1-3):573-578. · 3.19 Impact Factor
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N. C. Woolsey,
B. A. Hammel,
C. J. Keane,
C. A. Back,
J. C. Moreno,
J. K. Nash,
A. Calisti,
C. Mossé,
R. Stamm,
B. Talin,
A. Asfaw, L. S. Klein,
and R. W. Lee
Physical Review E 01/1998; 57:4650. · 2.26 Impact Factor
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N.C. Woolsey,
B.A. Hammel,
C.J. Keane,
C.A. Back,
J.C. Moreno,
J.K. Nash,
A. Calisti,
C. Mossé,
L. Godbert,
R. Stamm,
B. Talin,
C.F. Hooper,
A. Asfaw, L.S. Klein,
R.W. Lee
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ABSTRACT: A comprehensive spectroscopic investigation of plasmas at extreme conditions produced by indirectly driven inertially confined implosions is described. In these experiments argon is doped into the gas filled core of implosion targets and the Ar K-shell emission is used to make time resolved measurements of electron density and electron temperature. The electron density is derived from the Stark broadened Ar XVII 1s2-1s3p line shape, the electron temperature is derived from the line intensity ratio of the Ar XVII ls2-ls3p transition and the lithium-like dielectronic satellites 2121′, 2131′ lying on the low energy side of the resonance line.We give examples of the experimental data and compare the extracted time histories of electron density and electron temperature with simple radiation hydrodynamic simulations, where broad agreement is found. Detailed line shape measurements of the Ar XVII 1s2-1s3p transition are presented and the absence of an intensity dip at line center in the experiment results is discussed. The validity of the quasi-static ion approximation for these plasma conditions is tested by varying the mass of the fill gas in the core. Results from deuterium, deuterated methane, and nitrogen filled implosions are presented and indicate ion dynamic effects are not responsible for the line center discrepancy. We discuss other possibilities including spatial gradients in the core affecting measurements of the intrinsic line shape.
Journal of Quantitative Spectroscopy and Radiative Transfer 01/1997; 58(4-6):975-989. · 3.19 Impact Factor
