[en] The generator-load interaction in the Angara-5 installation is investigated. The electromagnetic processes in uniform transmission lines are described in terms of the incident and reflected waves, which means the current and voltage at any site of the line can be calculated; the energy reflectivity at nonregularities can be determined, and the relation between the readings of probes located at different sites can be established. The generator load and breakdown time of the separating diaphragm (of the accelerator tube) are determined as functions of time. The results are interpreted. The energy reflectivity at the end of the short-circuited transmission line is close to unity, and in the case of an energy absorbing load it is about 0.5. 10 refs., 4 figs

[en] Double liner (DL) concept to utilize Pulsed Power for investigations of Inertial Confinement Fusion (ICF) is proposed. In this scheme external cylindrical plasma shell (liner) magnetically imploded in the generator diode collides with the internal liner. Thermal x-ray radiation brought about by a high velocity shock wave penetrates into the internal liner cavity and irradiates a target. Investigations with ANGARA-5 generator were concentrated on a comprehensive study of physical processes and possibility of short radiation pulse generation. Soft x-ray radiation intensity up to 3 TW/cm² with 3 ns rise time was obtained. This paper reports on the concept, theoretical and experimental results. (Authors). 6 refs

[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] 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

[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] The implosion of wire arrays is studied at the Angara-5-1 facility with the help of an X-ray pinhole camera. It is shown that the drift of the plasma toward the axis occurs in the form of a 'plasma rainstorm'. The data constituting a part of the experimental database are presented. Based on these data, it is established that the spatial structure of an imploding plasma is highly inhomogeneous, so that it makes no sense to talk about a plasma shell that implodes as a single entity. In this case, plasma inhomogeneities arising due to a 'cold start' and prolonged plasma production have a decisive impact on the final parameters of a hyper-terawatt Z-pinch

[en] The method on the base of X-pinch is developed for radiography of current driven wire array implosion. The simple and nested arrays were investigated on installation Angara-5-1/ The experimental geometries and outcomes received at probing current - driven multiwire liners at the Angara-5-1 facility are presented

No abstract available

[en] In recent years, double liners have gained widespread application in inertial confinement fusion. When the outer shell, accelerated by a high current, collides with the inner liner, the conditions for irradiating nuclear-fusion targets can be created in the inner cavity of the latter (the so-called dynamic hohlraum). In this situation, the question of whether the azimuthal magnetic flux can penetrate the outer-liner plasma before the liners collide is of great importance. In experiments described in this study, the penetration of the magnetic flux into the gap between the liners during the implosion of the outer shell was recorded by the presence of the current in a cylindrical shunt mounted in place of the inner liner. The theoretical concept of a double liner is verified experimentally: it is shown that the magnetic flux does not penetrate into the inner region before the collision. Experiments were carried out in the Angara-5-1 facility