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Plasma diagnostics using Kα satellite emission spectroscopy in light ion beam fusion experiments

Published online by Cambridge University Press:  09 March 2009

J.J. MacFarlane ,
P. Wang ,
J.E. Bailey ,
T.A. Mehlhorn  and
R.J. Dukart
J.J. MacFarlane
Affiliation:
Fusion Technology Institute, University of Wisconsin, Madison, WI 53706
P. Wang
Affiliation:
Fusion Technology Institute, University of Wisconsin, Madison, WI 53706
J.E. Bailey
Affiliation:
Sandia National Laboratories, Albuquerque, sNM 87185
T.A. Mehlhorn
Affiliation:
Sandia National Laboratories, Albuquerque, sNM 87185
R.J. Dukart
Affiliation:
Sandia National Laboratories, Albuquerque, sNM 87185
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Abstract

Kα satellite spectroscopy can be a valuable technique for diagnosing conditions in high energy density plasmas. Kα emission lines are produced in intense light ion beam plasma interaction experiments as 2p electrons fill partially open Is shells created by the ion beam. In this paper, we present results from collisional-radiative equilibrium (CRE) calculations which show how Kα emission spectroscopy can be used to determine target plasma conditions in intense lithium beam experiments on Particle Beam Fusion Accelerator-II (PBFAII) at Sandia National Laboratories. In these experiments, 8–10 MeV lithium beams with intensities of 1–2 TW/cm2 irradiate planar multilayer targets containing a thin Al tracer. Kα emission spectra are measured using an X-ray crystal spectrometer with a resolution of λ/∆λ = 1200. The spectra are analyzed using a CRE model in which multilevel (NL ∼ 103) statistical equilibrium equations are solved self-consistently with the radiation field and beam properties to determine atomic level populations. Atomic level-dependent fluorescence yields and ion-impact ionization cross sections are used in computing the emission spectra. We present results showing the sensitivity of the Kα emission spectrum to temperature and density of the Al tracer. We also discuss the dependence of measured spectra on the X-ray crystal spectral resolution, and how additional diagnostic information could be obtained using multiple tracers of similar atomic number.

Type
Research Article
Information
Laser and Particle Beams , Volume 13 , Issue 2 , June 1995 , pp. 231 - 241
Copyright
Copyright © Cambridge University Press 1995

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