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High-precision measurement of velocity profiles in laser-created chlorine plasma

Published online by Cambridge University Press:  09 March 2009

O. Renner ,
E. Krouský ,
T. Mißalla ,
E. Förster  and
G. Hölzer
O. Renner
Affiliation:
Institute of Physics, Academy of Sciences of the Czech Republic, CZ-18040, Prague, Czech Republic
E. Krouský
Affiliation:
Institute of Physics, Academy of Sciences of the Czech Republic, CZ-18040, Prague, Czech Republic
T. Mißalla
Affiliation:
X-ray Optics Group of Max-Planck-Gesellschaft at the Friedrich-Schiller-Universität Jena, D-07743 Jena, Germany
E. Förster
Affiliation:
X-ray Optics Group of Max-Planck-Gesellschaft at the Friedrich-Schiller-Universität Jena, D-07743 Jena, Germany
G. Hölzer
Affiliation:
X-ray Optics Group of Max-Planck-Gesellschaft at the Friedrich-Schiller-Universität Jena, D-07743 Jena, Germany
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Abstract

A vertical dispersion variant of the Johann spectrometer has been used to record the highresolution X-ray spectra of the chlorine He-like resonance line group emitted from lowradiance plasma. The emission profiles were measured at two observation angles and decomposed into single spectral lines by using a fit based on the Levenberg-Marquardt algorithm. The results of computerized analysis of the one-dimensional (1-D) spatially resolved spectra were used to evaluate the distribution of the main plasma parameters. The electron temperature gradient 7.5·104 eV cm-1 was computed by modeling the measured spectra with the collisional-radiative package RATION. The blowoff maximum velocities 4.2–6.1·107 cm s-1 and the velocity gradients 0.9–1.6·109 s-1 were determined from the Doppler shifts of individual spectral lines within their different spatial extent.

Type
Research Article
Information
Laser and Particle Beams , Volume 13 , Issue 4 , December 1995 , pp. 503 - 510
Copyright
Copyright © Cambridge University Press 1995

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