Application of spectral line shapes to the study of high density ICF plasmas Page: 4 of 20
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Application of Spectral Line Shapes to the Study of High Density ICF
Plasmas
C.J. Keane, B.A. Hammel, S.H. Langer, and R.W. Lee
Lawrence Livermore National Laboratory, Livermore, CA 94550
A. Calisti, L. Godbert, R. Stamm, and B. Talin
Universite de Provence, Centre St. Jerome, Marseille, France
ABSTRACT
Spectral line broadening manifests itself in the study of high density
inertial confinement fusion (ICF) plasmas in two important ways. First,
comparison between measured and calculated lineshapes of individual
spectral lines or groups of lines is used to diagnose plasma conditions
in dense ICF plasmas, particularly in implosions. Secondly, through
the emission and absorption coefficients spectral lineshapes serve as
important inputs to plasma spectroscopy simulation codes which
calculate simulated spectra from ICF targets. We discuss recent results
from each of these areas. With regard to lineshape diagnostics, the
advent of generalized line broadening codes has allowed the line
profiles of complex multielectron emitters to be considered for
diagnostic purposes. Particular example of this is the use of Ar He-p and
its associated dielectronic satellites as a diagnostic of Te and Ne, as well
as the development of Ne-like Xe line broadening as a density
diagnostic. With respect to simulation codes, the implementation of
detailed lineshapes in calculations of this type is in many ways in its
infancy. We present here examples of cases where effects related to
spectral lineshapes such as continuum lowering and line transfer of
Stark broadened lines are important so as to provide a stimulus for
future work in this field.
INTRODUCTION
X-ray spectral diagnostics been extensively used as a diagnostic of
density and temperature in a wide variety of plasmas relevant to
inertial confinement fusion (ICF).1-11 In the case of diagnostics of
imploding capsules, trace concentrations (typically at the fraction of a
percent level) of mid-Z (Z-13-20) elements such as Ar or Cl are placed
in the fuel and/or ablator regions ;of the target. X-ray emission spectra
from these dopants are used to diagnose plasma conditions in the
capsule. The low concentration of these dopants results in minimal
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Keane, C. J.; Hammel, B. A.; Langer, S. H.; Lee, R. W.; Calisti, A.; Godbert, L. et al. Application of spectral line shapes to the study of high density ICF plasmas, article, September 1, 1994; California. (https://digital.library.unt.edu/ark:/67531/metadc684471/m1/4/: accessed April 25, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.