Dm. Chambers et al., Detailed hydrodynamic and X-ray spectroscopic analysis of a laser-producedrapidly-expanding aluminium plasma, J QUAN SPEC, 71(2-6), 2001, pp. 237-247
Citations number
14
Categorie Soggetti
Spectroscopy /Instrumentation/Analytical Sciences
Journal title
JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER
We present a detailed analysis of K-shell emission from laser-produced rapi
dly-expanding At plasmas. This work forms part of a series of experiments p
erformed at the Vulcan laser facility of the Rutherford Appleton Laboratory
, UK. 1-D planar expansion was obtained by over-illuminating Al-microdot ta
rgets supported on CH plastic foils. The small size of the At-plasma ensure
d high spatial and frequency resolution of the spectra, obtained with a sin
gle crystal spectrometer, two vertical dispersion variant double crystal sp
ectrometers, and a vertical dispersion variant Johann Spectrometer. The hyd
rodynamic properties of the plasma were measured independently by spatially
and temporally resolved Thomson scattering, utilizing a 4 omega probe beam
. This enabled sub- and super-critical densities to be probed relative to t
he 1 omega heater beams. The deduced plasma hydrodynamic conditions are com
pared with those generated from the 1-D hydro-code Medusa, and the signific
ant differences found in the electron temperature discussed. Synthetic spec
tra generated from the detailed term collisional radiative non-LTE atomic p
hysics code Fly are compared with the experimental spectra for the measured
hydrodynamic parameters, and for those taken from Medusa. Excellent agreem
ent is only found for both the H- and He-like At series when careful accoun
t is taken of the temporal evolution of the electron temperature. (C) 2001
Published by Elsevier Science Ltd.