Experimental and simulated profiles of the Al XIII Ly-α resonance line from a cylindrically expanding plasma.

Details Experimental and simulated profiles of the Al XIII Ly-α resonance line from a cylindrically expanding plasma. Experimental and simulated profiles of the Al XIII Ly-α resonance line from a cylindrically expanding plasma.

Dec 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997jqsrt..58..835p&link_type=abstract

Journal of Quantitative Spectroscopy and Radiative Transfer, vol. 58, issue 4-6, pp. 835-844

Computer Science

10

Aluminum: Line Profiles, Aluminum: X-Ray Lines, Aluminum: Plasma, Plasma: X-Ray Lines

Scientific paper

Spectral profiles of optically thick line radiation emitted by an expanding cylindrical laser-produced plasma have been recorded in high resolution using a vertical dispersion variant of the double-crystal spectrometer. By uniformly irradiating a narrow wire with a 1 ns pulse a quasi-steady plasma expansion is generated with a velocity gradient in excess of 109s-1. Such velocity fields strongly influence the transfer of radiation through a plasma, resulting in a complex distortion of the lineshapes of optically thick lines. The authors have computed theoretical profiles of the Al XIII Ly-α resonance line. Simulation of the laser-plasma interaction is performed using the 1D Lagrangian hydrocode MED103 which incorporates a non-LTE time-dependent excitation and ionisation package based on the average-atom model. Line emission profiles are calculated by the method of multi-frequency line transfer in the co-moving frame. The authors investigate the sensitivity of the lineshape on plasma parameters such as the velocity profile, comparing their theoretical predictions with experiment.

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