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Self-consistent variational calculation of the dense fluid helium plasma in the region of partial ionization

Lu Tie-Cheng Chen Qi-Feng Gu Yun-Jun Cai Ling-Cang Zhang Ying

Self-consistent variational calculation of the dense fluid helium plasma in the region of partial ionization

Lu Tie-Cheng, Chen Qi-Feng, Gu Yun-Jun, Cai Ling-Cang, Zhang Ying
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  • Received Date:  21 March 2006
  • Accepted Date:  13 April 2006
  • Published Online:  11 July 2007

Self-consistent variational calculation of the dense fluid helium plasma in the region of partial ionization

  • 1. (1)四川大学物理系,辐射物理及技术教育部重点实验室,成都 610064; (2)中国工程物理研究院流体物理研究所冲击波物理与爆轰波物理实验室,绵阳 621900; (3)中国工程物理研究院流体物理研究所冲击波物理与爆轰波物理实验室,绵阳 621900;四川大学物理系,辐射物理及技术教育部重点实验室,成都 610064

Abstract: The dense fluid helium will be ionized under high pressures and temperatures. The ionization energy of helium will be lowered as the result of interactions between all particles of He, He+, He2+, and e. In this paper, the thermodynamic parameters are obtained from nonideal ionization equilibrium, taking into account the correlation contributions to the chemical potential which is determined self-consistently by the free energy function. The theoretical equation of state (EOS) is verified by shock compression experiments and other theoretical calculations. The EOS of dense helium plasma are predicted and the contributrions of interactions are discussed for the density and temperature range of 10-3—100.3 g/cm3 and 4—7 eV, respectively. The calculations show that the pressure ionization is caused by the reduced ionization energy induced by the nonideal interactions, and the ionization energy should be corrected at high temperatures and densities.

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