Abstract
The quasi-isentropic compressibility of a strongly nonideal helium plasma in the pressure range 250–600 GPa is experimentally studied in devices with cylindrical geometry. The temperature at the front of a cylindrical shock wave in helium (T ≈ 10 000 K) and the flight speed of the inner cascade (W ≈ 3.5 km/s), in the cavity of which the maximum compressed plasma density is achieved, are measured. Data on the compression of a nonideal helium plasma to a density ρ ≈ 3 g/cm3 at an approximately constant final temperature of 21000 K are obtained. The trajectories of the metallic shells compressing the plasma are detected using high-power pulsed X-ray sources with a boundary electron energy of up to 60 MeV. The helium plasma density is determined using the radii of the shells measured at the time of their “stop.” The compressed plasma pressure is obtained using gasdynamic calculations. Comparative theoretical calculations of the quasi-isentropic compression parameters have been carried out using the following two theoretical models: the traditional chemical plasma model (SAHA code) and an ab initio quantum molecular dynamics (QMD) approach. No anomaly of the experimental data in the pressure range of the plasma phase transition theoretically assumed in helium is detected.
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ACKNOWLEDGMENTS
We thank S.E. Elfimov, E.V. Kulakov, A.S. Pupkov, A.V. Romanov, D.P. Turutin, A.I. Gurkin, M.V. Loginov, D.A. Linyaev, G.S. Yandubaev, V.V. Erastov, and V.V. Kovaldov for their assistance in conducting the experiments and processing the experimental data. We are also grateful to A.V. Shutov for fruitful discussions of the problem of dynamic compression of matter in the presence of phase transformations in it.
Funding
This work was supported by the Rosatom State Corporation in terms of the state program for the development of equipment, technologies, and scientific research in the field of atomic energy (RTTN) (project Study of Thermophysical Properties of Substances under Compression to Record High Pressures and Magnetic Fields), the Russian Foundation for Basic Research (project no. 20-02-00287), The Ministry of Science and Higher Education of the Russian Federation within the framework of the program for the creation of youth laboratories (project no. FSWE-2021-0010 Gas Dynamics and Physics of Explosion), and the National Center of Physics and Mathematics (Sarov, Nizhny Novgorod oblast).
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Translated by K. Shakhlevich
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Mochalov, M.A., Il’kaev, R.I., Fortov, V.E. et al. Quasi-Isentropic Compression of a Nonideal Helium Plasma at a Constant Final Temperature of 21 000 K and Pressures up to 600 GPa. J. Exp. Theor. Phys. 136, 389–404 (2023). https://doi.org/10.1134/S1063776123030032
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DOI: https://doi.org/10.1134/S1063776123030032