On diagnostic techniques for optically non-transparent superdense plasma

Possibilities are considered of optical, X-ray, magneto-probe methods for diagnostics of plasma of pulse high-current gas discharges at superhigh pressures (100-1000 at). Some results are presented on applying the methods, the method for measuring pulsed pressures during the discharge, the method of axial X-raying and measuring the electric conductivity of a dense plasma. The conductivity of argon and copper arc plasma has been measured by the method of axial X-raying at the pressure up to 1000 at and at the value of the Coulomb logarithm 1-3. A formula is derived which allows one to estimate the electric conductivity value for a dense non-ideal plasma to an accuracy of 50% in a very wide range of its parameters