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Spectrum and energy measurements of X-ray radiation
emitted by partially transparent Fe and Al plasmas have
been carried out for thin-layered inverted-corona targets
on the ISKRA-5 laser facility. The targets were plastic
spherical (2-mm diam) shells of 4.6 mm thickness having
0.25 mm Fe or 0.65 mm Al thin inner coatings. The energy
radiated in Heα and Lyα resonance
lines of Fe and Al ions was measured as well. Experimental
data and results of numerical calculations are compared.
Measured laser light to X-ray conversion coefficient has
been found to be essentially low, then calculated one for
both Fe and Al coated targets. Possible reasons for this
discrepancy are discussed.
The first experiments to study the shell's
controlled asymmetry of capsule with DT-fuel in a highly
symmetrical X-ray field, which is obtained inside a spherical
hohlraum, were implemented. The asymmetry results from
the coating of one hemisphere with the additional layer
of material. The main goal of the experiment was to define
the value of the capsule asymmetry, allowing us to experimentally
obtain the neutron yield, which would be very different
from the yield obtained in the experiment with the spherically
symmetrical shell having the same mass as the asymmetrical
one. It was shown that the shell asymmetry of ∼50%
leads to the ∼(2–4) times reduction of the neutron
yield as compared with the symmetrical shell. 2D calculations
of the asymmetric capsule compression, using the MIMOZA-ND
code, were conducted. The calculations demonstrated that
the compression of targets, when exploding pusher regime
occurs has a complicated character. The computational neutron
yield, and the delay of the neutron generation time are
in good agreement with the experimental data.
Measurements of spectral and energy X-ray characteristics
of almost transparent Fe plasma produced by laser radiation
inside the inverted-corona targets have been made at ISKRA-5
facility. The targets were spherical plastics cavities
with 2-mm diameter and 4.6-μm thickness covered from
inside with Fe layer 0.25-μm thickness. X-ray spectrum,
X-ray total energy, and the energy of a HeαFe
resonance line have been measured. Experimental data and
calculation results are collated.
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