Computational technique was investigated to determine electrical currents and equation of state parameters based on velocity measurements of specified surfaces in experiments with disk explosive magnetic generators (DEMG). The procedure is based on running one-dimensional MHD computations in the shell of optimizers, which make possible currents and EOS parameters optimization. Some possibilities were investigated to study shockless loading of materials to megabar pressure with the disk explosive generator systems (DEMG) with a foil opening switch (FOS) [1,2]. It is possible to obtain isentropic compression of materials to pressure more than 10 Mbar [3] in such systems. Numerical estimation of the equation of state (EOS) parameters is presented in this paper for different Cu, W, Ta-samples compressed shocklessly with Al and Cu-pushers to high pressures. Simulation of experiments was carried out to study material properties under isentropic compression with different EOS parameterizations for the synthesized inner sample surface velocities.

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[1] S.D. Kuznetsov, A.M. Buyko, S.F. Garanin et al. Simulation of Isentropic Compression of Aluminum by Magnetically Imploded Liners in experiments ALT-1-3 // 2018 16th International Conference on Megagauss Magnetic Field Generation and Related Topics (MEGAGAUSS), Kashiwa, doi: 10.1109/MEGAGAUSS.2018.8722649

[2] V. A. Karepov, S. D. Kuznetsov, On possibility to use systems based on disk explosive magnetic generators to study properties of copper and aluminum under shockless compression // 2019 11th International Conference on Dense Z-Pinches (DZP 2019), Beijing, China

[3] A.M. Buyko, Simulations of ramp compression of metals to 40 Mbar by magnetic implosion of liners driven by disk explosive magnetic generators//XV International Conference Zababakhin’s scientific readings, 2021, ISBN 978-5-6045087-4-9