Monte-Carlo simulation of photon transport for optically thick, differentially moving plasmas. I. The argon He-like resonance- and intercombination lines.

Details Monte-Carlo simulation of photon transport for optically thick, differentially moving plasmas. I. The argon He-like resonance- and intercombination lines. Monte-Carlo simulation of photon transport for optically thick, differentially moving plasmas. I. The argon He-like resonance- and intercombination lines.

Aug 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995jqsrt..54..361s&link_type=abstract

Journal of Quantitative Spectroscopy and Radiative Transfer, vol. 54, issue 1-2, pp. 361-376

Mathematics

Probability

4

Radiative Transfer: Plasma

Scientific paper

The intensity ratio between the He-like resonance and intercombination line is a widely used tool to determine the electron density in highly ionized plasmas. For micropinch and many Z-pinch plasmas the determination of the plasma density is difficult and often inaccurate because of two properties of these plasmas: optical thickness, which mostly effects the resonance transition; and, high compression and expansion velocities which yield a modified absorption probability for resonance and intercombination photons. A Monte-Carlo method was used for the simulation of photoabsorption under these conditions, taking into account the change of the absorption probability for a single line, the effects of asymmetric repumping of one line by the photons originated by another transition in a many level system, and the influence of higher order (n = 3) satellites on the observed line profiles under these conditions. The simulation reproduces the often observed shift of the line center and the appearance of a shoulder on one wing of the resonance line profile. The authors then develop these two features, line shift and wing shoulder to obtain additional information about the plasma such as an estimate about the compression/expansion velocity of the plasma. The calculations were performed for several values of the plasma diameter and compression (expansion) velocities and allow a more precise estimate of the plasma density.

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