Diagnosis of core-shell mixing with absorption and emission spectra of a doped layer. Final technical report Page: 2 of 6
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lines. Additionally, the absorption lines provide information on the temperature
and pAr of the imploded shell. We propose to modify the amount of mixing by
varying the degree of irradiation uniformity. This can conveniently be achieved by
switching off SSD (Smoothing by Spectral Dispersion), then going to one-
dimensional SSD, and finally to two-dimensional SSD. The chosen convergence
will have to be low enough that with the best uniformity there will be very little
mixing, but high enough that significant mixing will occur with the minimum
uniformity. The specific tasks are as follows.
(1) Using the codes we developed (see below) for modeling mixing and
radiation transport, optimize the parameters of the doped layer as an input for
target fabrication. This includes the location of the doped layer within the shell,
its thickness, the nuclear charge of the dopant element, the dopant concentration
(or the dopant areal density pAr).
The considerations for this optimization are: the doped layer should be
removed enough from the fuel-shell interface so that in the absence of mixing
there will be minimal emission, but not too removed so that only high level of
mixing will result in emission lines. The layer thickness and dopant
concentration should be small, to minimize affecting target behavior, but large
enough to cause significant line absorption. The dopant Z should be accessible to
target fabrication and should be the smallest such that absorption by the polymer
shell be small at the relevant spectral range. See below results of our modeling
which show examples of such optimization.
(2) Verifying the effect of doping on the performance and behavior of the
targets. This will be done by shooting targets filled with DD (deuterium) with and
without doping and measuring the nuclear yield and secondary nuclear reaction
products (as a signature of the pr of the compressed core).
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Diagnosis of core-shell mixing with absorption and emission spectra of a doped layer. Final technical report, report, May 1, 1998; United States. (https://digital.library.unt.edu/ark:/67531/metadc697917/m1/2/: accessed April 25, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.