An introduction to the theory and use of SESAME equations of state

Technical Report · Wed Dec 12 04:00:00 EST 2018

DOI:https://doi.org/10.2172/1487368· OSTI ID:1487368

McHardy, James D. ^[1]

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1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

This paper details aspects of the three-component, Helmholtz free energy, equation of state (EOS) model that serves as the construction basis for the majority of the tabular equations of state residing in the SESAME database. The three components account for contributions to the total free energy from the cold curve (or zero Kelvin isotherm), the nuclear vibrational excitations, and the thermal electronic excitations. Decomposition of the model into these three components is a consequence of the underlying theoretical framework describing materials in the condensed matter phase since each of the free energy components directly correspond to a term in the condensed matter system Hamiltonian. In addition to providing an introduction to the theoretical basis of the three-component model and an account of the empirical data utilized to construct an EOS, the aim of this paper is to enable readers to evaluate the applicability of a particular EOS within the context of a problem they are solving by reviewing the thermodynamic phase space in which it has been appropriately constrained. This paper does not aim to serve as an exhaustive documentation of the various methods used in construction of the SESAME tables. Instead, it focuses on the models used during the construction of a particular EOS for aluminum performed by Sjostrom et al. [SCR16] as an illustrative example.

• Research Organization: Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
• Sponsoring Organization: USDOE
• DOE Contract Number: 89233218CNA000001
• OSTI ID: 1487368
• Report Number(s): LA--14503
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS