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In ignition targets designs, U or U based cocktail hohlraum are usually used because the Rosseland mean opacity of U is higher than for Au at the radiation temperature for ignition. However, it should be noted that the opacity of U is obviously lower than for Au when the radiation temperature falls into a low temperature region. Because the depth penetrated by radiation is only several micrometers under a 300eV drive, and also because there is a prepulse longer than 10 ns prepulse at temperatures lower than 170 eV in the radiation drive of ignition target designs. Therefore we propose an Au + U + Au sandwich hohlraum for ignition targets in this work. Compared to the cocktail, the sandwich not only remarkably simplifies the fabrication and uses less depleted U material, but also increases the albedo during the prepulse.
Radiation transfer in low-density foam is influenced by the external
radiation field which impacts on the foam when the size of plasma created
in laboratory is not large to be opatical thick. The radiation transfers
of different photon groups are sensitive probes of the conditions of the
medium through which they propagate. The temporal behavior of photon
groups to which the plasma is optical thin is quite different from that of
photon groups to which the plasma is optical thick. The breakout times of
different photon groups through the foam are distinguishable different in
experiment when we measures them at the end of foam. The multi-group
supersonic radiation transfer behavior in low-density foam is studied both
by multi-group transfer numerical simulation and experiments. Two
characteristic photon groups are chosen to do experimental research on the
multi-group transfer behavior in low-density CH foam. A time-resolved
chromatic streaked X-ray spectrometer measure the breakout of the two
photon group from the far end of the foam cylinder. The distinguishable
transfer time delay between two groups is observed.
A two-dimensional (2D) multigroup radiation transfer hydrodynamics
code LARED-R-1 is used to simulate a supersonic wave experiment performed
earlier by the Livermore group. The main result is that, contrary to the
conclusion of Back et al. (2000a), the average-atom opacity model is
sufficient to explain the obtained experimental results, provided that an
adequate description of the radiation transport was used. The simulation
results from LARED-R-1 show the spectrum of radiation in foam with radius
and length of several optical depths is not in Planckian distribution and
the angular intensity distribution is anisotropic.
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