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Description
Implosion of quasi-spherical wire arrays opens the possibility of more efficient use of the kinetic energy of the material being compressed to create a source of soft X-rays (SXR), compared to two-dimensional compression in the case of a cylindrical wire array. This is due to the contribution of the kinetic energy of the axial movement of the plasma into the internal energy of SXR source. An additional advantage of three-dimensional implosion is more symmetrical spatial distribution of the plasma, which allows achieving greater uniformity of energy flux on the target. The purpose of the experiments was to achieve three-dimensional synchronous compression of the plasma in the geometric center of a quasi-spherical array. Quasispherical arrays with different initial distribution of linear mass on the wires have been used to find optimal synchronization conditions. We used a set of independent diagnostic techniques for measuring spatial-temporal characteristics of the plasma compression dynamics and its dependence on the linear mass profile of quasi-spherical arrays. It is shown that the measurement of the magnetic field in the plasma of quasi-spherical array provides information about the production and dynamics of the plasma flow from different regions of the array. For the optimal linear mass profile (ml(θ) = m0/sinθ), it follows from the measured distribution of the azimuthal magnetic field that, in the stage of plasma production up to the SXR pulse, the plasma with the frozen-in magnetic field penetrates the array from the polar and equatorial regions almost synchronously. The size and shape of the X-ray radiation source in quasispherical current implosion were inferred from plasma emission spectrum measurement with spatial resolution and registration of framing X-ray images. Estimation of the radiation flux on the surface of such a source was received.
