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Return To: Session IF - Inertial Fusion
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Abstract. Recent experiments show that the implosion dynamics of wire
array Z-pinches is significantly different from that of a thin plasma
shell. During the first 
80% of the implosion the interior
of the array is gradually filled by the plasma ablated from the stationary
wire cores. This phase ends with the formation of gaps in the wire cores,
which occurs due to non-uniformity of the ablation along the wires. The
final implosion phase occurs as a snowplough implosion of the radially
distributed plasma, previously injected into the interior of the array. The
axially peaked density distribution of the precursor plasma leads to a more
stable implosion than previously thought, when the Rayleigh-Taylor was
assumed to dominate. A hybrid ion Fokker-Planck code with radiation losses
was used to describe the dynamics of the plasma flow. The magnetic Reynolds
number of the coronal plasma around each wire can be shown in 3-D model to
be less than one, thus explaining the current-less inward precursor plasma
flow. 2-D and 3-D simulations of wire arrays model the switching of current
from the wire plasma to the snowplough implosion.
IAEA 2003