Properties of shock and quasi-isentropically compressed krypton in the pressure range of up to 2700 GPa

The density of shock-compressed liquid krypton $\rho\approx9$ g/cm$^3$ and the temperature $T \approx 55 000$ K on the main Hugoniot adiabat in the pressure range of $P= 140$–$255$ GPa have been measured with hemispherical shock wave generators. Using spherical devices, gaseous krypton has been compressed to the density $\rho\approx20$ g/cm$^3$ by the pressure $P\approx 2700$ GPa at the temperature $T\approx 120\,000$ K. The experiment has been carried out at the X-ray diffraction complex RGK-B-L (Russian Federal Nuclear Center All-Russian Scientific Research Institute of Experimental Physics) consisting of BIM $234.3000$ betatrons with a boundary energy of 60 MeV used in the multipulse bremsstrahlung generation regime with a multichannel optoelectronic detection system for X-ray images. The designs of the experimental devices have been described, and the thermodynamic parameters of the krypton plasma reached in these devices have been estimated. The obtained data have been analyzed and compared to previously reported data. The compression of krypton to the density $\rho\approx 20$ g/cm$^3$ by the pressure$P\approx 2700$ GPa is currently a record achievement.