Experimental study demonstrates extreme compression densities in helium and deuterium plasmas at 1500–2200 GPa, indicating near-complete helium ionization under planetary core conditions.
The quasi-isentropic compressibility of helium and deuterium plasmas at pressures of up to 1500–2000 GPa has been measured using devices with spherical geometry and an X-ray diagnostic complex comprising three betatrons and a multichannel imaging system with electro-optic gamma detectors. A deuterium density of 4.5 g/cm 3 and a helium density of 3.8 g/cm 3 have been obtained at pressures of 2210 and 1580 GPa, respectively. The internal energy of a deuterium plasma at the indicated pressure is about 1 MJ/cm 3 , which is about 100 times greater than the specific energy of condensed chemical explosives. Analysis of the obtained data shows that the degree of helium ionization under the achieved plasma compression parameters is about 0.9.
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Mochalov et al. (2012) studied this question.
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