Simulation of plasma dynamics in Gas Embedded Z-pinches

The interest to the Gas Embedded Z-pinch, i.e. plasma column surrounded by the electrically neutral gas, is related first of all to its inherent stability to m=0 mode, high value of electron density and relatively simple experimental layout. Experimental results, obtained over 10 years, confirm that pinch evolution is strongly affected by the scheme of initial preionization. For simulation of plasma dynamics in Gas Embedded Z-pinch one-fluid one-dimensional two-temperature MHD code is applied. Full range of ionization degree is considered in order to investigate the processes of magnetic field penetration through the gas toward the discharge zone, heating and ionization of the gas in the vicinity of plasma column. Numerical results revealed that Gas Embedded Z-Pinch has complex inner structure. Dynamics of this structure has been analyzed for different scheme of preionization.