Abstract. Experimental results are presented on implosion of wire arrays, on sharpening the pulse by using plasma opening switches (POS), and also the ``super-fast plasma flow switch'' to study the problem of Hohlraum on the current generation of machines. We have obtained on the S-300 generator the extreme switching rate 1015 A/sec. The radiative temperature of the inner wall of the cavity has been recorded 50 eV. The possibility was studied of using the POS as output cascades of generators with typical current amplitudes of several tenth MA. On the RS-20 generator, by using the applied magnetic field, the output voltage 3.2-3.5 MV was obtained, by the pulse duration 100 ns. The precise measurement of the POS output voltage has been carried out by recording the high-energy boundary of Bremsstrahlung spectrum on the base of photo-nuclear reactions Be9(, n) Be8 and D2(, n)p. The regime of extended plasma production of the wire array implosion was investigated on the Angara-5 machine. The new physical model of this process has been elaborated. The structure of wire dense cores was recorded by means of X-ray backlighting of the array by radiation of an extrinsic X-pinch.