IMPLOSION DYNAMICS OF A RADIATIVE COMPOSITE Z-PINCH

Two-dimensional simulation of a composite Z-pinch was performed by the complete radiative magnetohydrodynamic (MHD) code ZETA including deta iled calculation of equations of state, spectral properties of materia ls, and radiation transport in non-local thermodynamic equilibrium mul ticharged ions plasma. The initial geometry, the substance components, and the electric current through the Z-pinch were similar to the join t experiment set up JEX-94 at Angara-5 facility. The geometry was: ann ular argon gas puff with inner and outer diameter of a nozzle cross se ction, 3 cm and 3.4 cm, respectively, and specific mass of 80 mu g/cm. Inside it along the axis a foam cylinder 30%KCl in agar-agar with tot al mass 60 mu g and diameter 1 mm was put. The initial gas distributio n was modeled with a divergence of a jet along the Z-axis. A coupling of the Z-pinch with the electric current generator was modeled by an e lectrical circuit with a given electromagnetic wave, a resistance, an inductance, and a variable load (Z-pinch) similar to the Angara-5-1 ou tput parameters. During the plasma implosion the total current reached the value of 3 MA at a time of 85 ns from the voltage start. Such cur rent amplitude is much less than through the matched load (up to 4 MA as a rule), The plasma implosion is accompanied by the development of different types of short and long wave instabilities (thermal, radiati ve, nonisothermal, and MHD Rayleigh-Taylor modes), in this report, the detailed plasma implosion dynamics, the influence of instabilities, a nd the spectral radiation yield are discussed, and a comparison with t he experimental results is done.