Systematic investigation of NLTE phenomena in the limit of small departure from LTE

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In this paper, we begin a systematic study of Non-Local Thermal Equilibrium (NLTE) phenomena in near equilibrium (LTE) high energy density, highly radiative plasmas. It is shown that the principle of minimum entropy production rate characterizes NLTE steady states for average atom rate equations in the case of small departures form LTE. With the aid of a novel hohlraum-reaction box thought experiment, we use the principles of minimum entropy production and detailed balance to derive Onsager reciprocity relations for the NLTE responses of a near equilibrium sample to non-Planckian perturbations in different frequency groups. This result is a significant symmetry ... continued below

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11 p.

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Libby, S.B.; Graziani, F.R.; More, R.M. & Kato, T. July 1, 1997.

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In this paper, we begin a systematic study of Non-Local Thermal Equilibrium (NLTE) phenomena in near equilibrium (LTE) high energy density, highly radiative plasmas. It is shown that the principle of minimum entropy production rate characterizes NLTE steady states for average atom rate equations in the case of small departures form LTE. With the aid of a novel hohlraum-reaction box thought experiment, we use the principles of minimum entropy production and detailed balance to derive Onsager reciprocity relations for the NLTE responses of a near equilibrium sample to non-Planckian perturbations in different frequency groups. This result is a significant symmetry constraint on the linear corrections to Kirchoffs law. We envisage applying our strategy to a number of test problems which include: the NLTE corrections to the ionization state of an ion located near the edge of an otherwise LTE medium; the effect of a monochromatic radiation field perturbation on an LTE medium; the deviation of Rydberg state populations from LTE in recombining or ionizing plasmas; multi-electron temperature models such as that of Busquet; and finally, the effect of NLTE populations shifts on opacity models.

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11 p.

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OSTI as DE98051063

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  • 13. international conference on laser interaction and related plasma phenomena, Monterey, CA (United States), 13-18 Apr 1997

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  • Other: DE98051063
  • Report No.: UCRL-JC--125842
  • Report No.: CONF-970407--
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 642513
  • Archival Resource Key: ark:/67531/metadc691957

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  • July 1, 1997

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  • Aug. 14, 2015, 8:43 a.m.

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  • May 8, 2017, 12:46 p.m.

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Libby, S.B.; Graziani, F.R.; More, R.M. & Kato, T. Systematic investigation of NLTE phenomena in the limit of small departure from LTE, article, July 1, 1997; California. (digital.library.unt.edu/ark:/67531/metadc691957/: accessed September 24, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.