No abstract available

No abstract available

[en] The results of the experiments on the X-ray sounding of the axial region of the liner, compressed by the current of the heavy-current generator, are presented. The soft X-pinch X radiation source was applied and the radiation was registered by the p-i-n diodes. Application of several filters with different transmission windows before the p-i-n diodes made it possible to provide for the interpretation of the measurement results in the experiments with the cascade liners of the complex elementary composition. The advantages of the method consist in the high time resolution (≅ 1 ns) and the possibility of delimiting by time the flashes from the Z-pinch radiation in the liner axis and from the X-pinch radiation

[en] Results of measurements of the axial magnetic field during the implosion of tungsten wire arrays in the Angara-5-1 facility at currents of 2.5-4.5 MA are presented. The azimuthal structure of the plasma produced from the wires is examined using the effect of the compression of the axial magnetic flux by this plasma. It is shown that the plasma starts to penetrate into the axial region of the wire array at the very beginning of implosion. A mechanism other than the formation of a closed current-carrying shell is proposed for describing the transfer of the external axial magnetic field to the central region of the array

[en] The methodology for the X-ray diagnostics of the liner peripheral part at the Angara-5-1 facility through the X-pinch - the point X-ray source is described. The spatial resolution is not worse than 4 μm. The X-pinch radiation absorbed in the plasma, is registered on the photofilm. Transition from the darkening photomaterial density to the plasma density is provided for by means of application of the stepwise attenuator from the material analogous to the liner one. The results of the diagnostics of the peripheral part of the multiwire liner for the 70 ns after the current start through the liner are presented. The axial stratification with the pitch of 200 μm of the plasma density, breaking away from the wires, is observed

No abstract available

[en] The data on measurements of magnetic fields in plasma during current implosion of multiwire cylindrical liners at the Angara-5-1 facility are presented. The compression of an axial magnetic flux with the plasma produced by a multiwire liner is investigated. A compression model for such flux is suggested. Radial and azimuthal structures of the current plasma are studied. It has been shown that in the process of the plasma production a magnetic field is frozen-in to the plasma. The liner volume is filled with the plasma impregnated with current and magnetic field

[en] Backlighting diagnostics for studying the peripheral region of an imploding liner in the Angara-5-1 facility by using X-ray emission from an X-pinch is described. The spatial resolution of the diagnostics was no worse than 4 μm. The X-pinch emission passed through the plasma was recorded with a photofilm. The plasma density was reconstructed from the photofilm blackening density with the help of a step attenuator made of the same material as the liner. Results are presented from experiments on X-ray backlighting of the peripheral region of a multiwire liner at the 70th ns after the beginning of the discharge. It was found that, by this time, the wire cores were depleted to different extent, their masses totalled 70% of the original wire mass, and their diameters had increased approximately threefold. The plasma ejected from the wire cores was found to be axially stratified with a spatial period of 200 μm. Sometimes the axial nonuniformity of the core material with a characteristic scale length of 20 μm was observed

[en] Results are presented from measurements of the axial magnetic field during the implosion of tungsten wire arrays in the Angara-5-1 facility at currents of 2.5-4.5 MA. The azimuthal structure of the plasma produced from the wires is examined using the effect of the compression of the axial magnetic flux by this plasma. It is shown that the plasma starts to penetrate into the axial region of the wire array at the very beginning of implosion. A mechanism other than the formation of a closed current-carrying shell is proposed for describing the transfer of the external axial magnetic field to the central region of the array

[en] Results are presented from experiments on the X-ray backlighting of the axial region of an imploding high-current multiwire liner. Backlighting was performed with the use of an X-pinch serving as a source of soft X-ray emission, which was recorded by pin diodes. The use of several filters with different passbands in front of the pin diodes allowed the interpretation of the results of measurements in experiments with cascade composite liners. The sensitivity of the diagnostics was ≅125 μg/cm² for a plasma of high-Z elements (W) and ≅220 μg/cm² for a plasma of low-Z elements (C, O, N) at a photon energy of the probing radiation of 1.0-1.5 keV. An advantage of the method is its high time resolution (≅1 ns) and the possibility of the separation in time of the emission bursts from Z- and X-pinches on the liner axis. The method does not impose restrictions on the pulse duration of the backlighting radiation source