Application of Laboratory Experiments and Atomic
Physics Modeling to Astrophysical Observations
Kevin B. Fournier, M. Finkenthal, M.J. May,
M. Mattioli, W.H. Goldstein, S.B. Hansen
Lawrence Livermore National Laboratory
PO Box 808, L-473
7000 East Avenue,
Livermore, CA 94550
We present examples of observations of x-ray and XUV emission
spectra from magnetically confined laboratory plasmas. We emphasize
the strengths of these thermal-plasmas: the control over plasma
and sample conditions and accurate measurements of the main plasma
parameters (electron temperature, density), the high brightness
of emitted spectra, and their similarities to astrophysical plasmas,
and their challenges, such as blending problems between emission
from intrinsic and injected 'impurities' (the main plasma is
composed of hydrogen or deuterium atoms). Specific emphasis is
given to study of line ratios and ionization balance for L- and
M-shell Fe ions. Interpretation of the spectra relies on complex
collisional-radiative modeling and high quality atomic data.
A specific application of observations and calculations of M-shell
Fe ionization balance to recent CHIPS results is presented.
This work performed under the auspices of
the US DoE by UC LLNL under contract No. W-7405-Eng-48.