Numerical modelling of MHD instabilities in Z-pinch hot spot

The focus of the work is on the study of some physical mechanisms connected with Rayleigh-Taylor-type MHD instabilities development. We compare our numerical results with experimental data obtained at High Current Electronics Institute (HeEl, Tomsk) [1]. Dependence of liner stability and radiation output vs. mass of liner, its initial radius, cascade scheme has been investigated in Tomsk. In our paper we try to explain by ID and 2D MHD modelling the obtained experimental data and to analyze the role of main scales determining the liner implosion: magnetic field penetration into the body of plasma, heat-conductivity, radiation transfer. Some phenomena are investigated: shock wave motion, ionization, axial plasma motion and others. For double gas puff the collision of outer cascade with inner plasma is investigated in detail.