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Titolo:
X-RAY SPECTROSCOPY OF HIGH-ENERGY DENSITY INERTIAL CONFINEMENT FUSIONPLASMAS
Autore:
KEANE CJ; HAMMEL BA; KANIA DR; KILKENNY JD; LEE RW; OSTERHELD AL; SUTER LJ; MANCINI RC; HOOPER CF; DELAMATER ND;
Indirizzi:
LAWRENCE LIVERMORE NATL LAB LIVERMORE CA 94550 UNIV FLORIDA GAINESVILLE FL 32611 LOS ALAMOS NATL LAB LOS ALAMOS NM 87545
Titolo Testata:
Physics of fluids. B, Plasma physics
fascicolo: 9, volume: 5, anno: 1993,
pagine: 3328 - 3336
SICI:
0899-8221(1993)5:9<3328:XSOHDI>2.0.ZU;2-2
Fonte:
ISI
Lingua:
ENG
Soggetto:
LASER-PRODUCED PLASMAS; K-SHELL; DRIVEN IMPLOSIONS; LINE-PROFILES; TEMPERATURE; DIAGNOSIS; EXCITATION; EMITTERS; SPECTRA; CARBON;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
44
Recensione:
Indirizzi per estratti:
Citazione:
C.J. Keane et al., "X-RAY SPECTROSCOPY OF HIGH-ENERGY DENSITY INERTIAL CONFINEMENT FUSIONPLASMAS", Physics of fluids. B, Plasma physics, 5(9), 1993, pp. 3328-3336

Abstract

Analysis is presented of K- and L-shell spectra obtained from Ar and Xe dopants seeded into the fuel region of plastic capsules indirectly imploded using the Nova laser. Stark broadening measurements of the n = 3-1 lines in H- and He-like Ar (Ar Ly-beta and He-beta, respectively) are used to infer fuel electron density, while spatially averaged fuel electron temperature is deduced from the ratio of the intensities of these lines. Systematic variations in Ar spectral features are observed as a function of drive conditions. A spectral postprocessing code has been developed to simulate experimental spectra by taking into account spatial gradients and line transfer effects, and shows good agreement with experimental data. It is shown that correct modeling of the x-ray emission requires a proper treatment of the coupled radiative transfer and kinetics problem. Continuum lowering effects are shown not to affect diagnostic line ratios, within the confines of a simple model. A recently developed diagnostic based on fitting measured line profiles of Ar He-beta and its associated dielectronic satellites to theory is shown to provide a simultaneous measure of electron temperature and electron density. L-shell Xe spectroscopy is under development as an electron temperature and electron-density diagnostic. Density and temperature sensitive ratios of spectral features each consisting of many lines have been identified. Observed Xe spectra from imploded cores show the same qualitative behavior with temperature, as predicted by model calculations of Xe emission spectra. Stark broadening of Ne-like Xe 4-2 lines appears viable as an electron density diagnostic for N(e)approximately 10(25) CM-3 and is under continuing investigation. (Based on the invited paper 8I3 at the 1992 APS/DPP annual meeting [Bull. Am. Phys. Soc. 37, 1553 (1992)].)

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Documento generato il 22/09/20 alle ore 16:50:42