Quasi-Isentropic Compressibility of Gaseous Deuterium in Pressure Range up to 300 GPa

The authors discuss results of experiments with measurement of compression of gaseous deuterium at initial pressure of 25MPa in the pressure range up to 300GPa in cylindrical steel chambers capable to transform shock compression into quasi‐isentropic compression. To record time trajectories of motion of steel shells compressing gas, two independently‐operating sources of hard gamma‐radiation with beams crossed at angle of 135° were used.