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.

中文翻译：

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在高达 250 GPa 的压力下对氘及其混合物的非理想等离子体进行准等熵压缩

摘要

我们提供了在 150-250 GPa 压力范围内的圆柱形几何器件中氘-氦混合物的强耦合（非理想）等离子体的准等熵压缩率数据，以及在“纯”实验中获得的新结果压力 ~200 GPa 的氘。使用具有高达 60 MeV 边界电子能量的强大脉冲 X 射线源记录等离子体压缩金属壳的轨迹。氘等离子体及其与氦的混合物的密度是根据外壳“停止”瞬间测量的半径确定的。我们基于气体动力学计算得出了压缩等离子体的压力，包括实验装置的真实特性。