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.