Results of Experiments on Quasi-Isentropic Compression of Deuterium and Helium to Extreme Pressures of »3000 GPa
M. V. Zhernokletov1,2, V. A. Raevskii1, S. F. Manachkin1, N. B. Davydov1, K. N. Panov1, A. V. Ryzhkov1, V. A. Arinin1, B. I. Tkachenko1, A. I. Logvinov1,2, V. A. Komrakov1, A. I. Davydov1, N. N. Anashkin1
1Institute of Physics of Explosion, Russian Federal Nuclear Center - All-Russian Research Institute of Experimental Physics, Sarov, 607188 Russia
2Sarov Physical-Technical Institute-Branch of National Nuclear Research Institute of the University, Sarov, 607186 Russia
Keywords: дейтерий, гелий, квазиизоэнтропическое сжатие, уравнение состояния, deuterium, helium, quasi-isentropic compression, equation of state
Abstract
Experiments were performed to study the spherical compression of deuterium and helium to pressures of ≈3000 GPa in a quasi-isentropic regime. The process was recorded by a multi-frame radiographic system which produces up to nine X-ray images of a cavity with gas at various times in one experiment. X-ray images show that explosive devices provide a cavity shape close to spherically symmetric with gas up to the maximum compression of the gas. The experimental data are in good agreement with the results of calculations performed using the RFNC-VNIIEF equations of state of the gases studied. The results of these calculations are used to determine the parameters of the region of compressed gas states reached in the experiments: for deuterium, density 5.5 g/cm3 and pressure 3.6TPa; for helium, density 4.7 g/cm3 and, pressure 2.4 TPa.
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