Abstract
We present data on the quasi-isentropic compressibility of a strongly coupled (nonideal) plasma of a deuterium–helium mixture in the range of pressures 150–250 GPa in devices with a cylindrical geometry and a new result obtained in an experiment with “pure” deuterium at a pressure ~200 GPa. The trajectory of the plasma-compressing metallic shells was recorded using powerful pulsed X-ray sources with a boundary electron energy up to 60 MeV. The densities of the plasma of deuterium and its mixture with helium were determined from the measured radii of the shells at the instant of their “stopping.” We derived the pressure of the compressed plasma based on gasdynamic computations including the real characteristics of the experimental devices. The data obtained confirm the conclusion previously reached at VNIIEF about a phase transition in the plasma of compressed deuterium in the range of pressures 150–160 GPa and suggest that this phase transition is retained in the mixture of deuterium with helium.
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Notes
The private communication by A.P. Tolochko (1926–2009) from VNIIEF.
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ACKNOWLEDGMENTS
We are grateful to the research workers that participated in organizing and conducting the experiments and processing the data: A.B. Prof, A.I. Lebedev, S.E. Elfimov, R.V. Borisov, E.P. Volkov, R.V. Tilkunov, O.A. Esin, V.V. Kovaldov, A.V. Romanov, D.P. Turutin, A.S. Pupkov, G.S. Yandubaev, I.A. Blinov, M.V. Loginov, E.V. Shevnin, and A.I. Gurkin. We thank A.V. Shutov for the gasdynamic computations using the SAHA EOS and A.B. Medvedev for the fruitful discussions of the problem of anomalous thermodynamic properties of dense hot hydrogen (deuterium) in the range of megabar pressures.
Funding
This work was supported by the Russian Foundation for Basic Research (project no. 20-02-00287) and the Ministry of Science and Higher Education of Russia (contract no. 075-15-2020-785 with the Joint Institute for High Temperatures of the Russian Academy of Sciences).
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Mochalov, M.A., Il’kaev, R.I., Fortov, V.E. et al. Quasi-Isentropic Compression of a Nonideal Plasma of Deuterium and its Mixture with Helium at Pressures up to 250 GPa. J. Exp. Theor. Phys. 132, 985–998 (2021). https://doi.org/10.1134/S1063776121060133
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DOI: https://doi.org/10.1134/S1063776121060133