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Atoms 2015, 3(2), 162-181; doi:10.3390/atoms3020162

Tungsten Ions in Plasmas: Statistical Theory of Radiative-Collisional Processes

1
National Research Center “Kurchatov Institute”, Academician Kurchatov square 1, Moscow 123182, Russia
2
National Research Nuclear University MEPhI (Moscow Engineering Physics Institute), Kashirskoe sh.31, Moscow 115409, Russia
3
Moscow Institute of Physics and Technology, Dolgoprudny, Moscow Region 141707, Russia
*
Author to whom correspondence should be addressed.
Academic Editor: Bastiaan J. Braams
Received: 27 February 2015 / Accepted: 6 May 2015 / Published: 25 May 2015
(This article belongs to the Special Issue Atomic Data for Tungsten)
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Abstract

The statistical model for calculations of the collisional-radiative processes in plasmas with tungsten impurity was developed. The electron structure of tungsten multielectron ions is considered in terms of both the Thomas-Fermi model and the Brandt-Lundquist model of collective oscillations of atomic electron density. The excitation or ionization of atomic electrons by plasma electron impacts are represented as photo-processes under the action of flux of equivalent photons introduced by E. Fermi. The total electron impact single ionization cross-sections of ions Wk+ with respective rates have been calculated and compared with the available experimental and modeling data (e.g., CADW). Plasma radiative losses on tungsten impurity were also calculated in a wide range of electron temperatures 1 eV–20 keV. The numerical code TFATOM was developed for calculations of radiative-collisional processes involving tungsten ions. The needed computational resources for TFATOM code are orders of magnitudes less than for the other conventional numerical codes. The transition from corona to Boltzmann limit was investigated in detail. The results of statistical approach have been tested by comparison with the vast experimental and conventional code data for a set of ions Wk+. It is shown that the universal statistical model accuracy for the ionization cross-sections and radiation losses is within the data scattering of significantly more complex quantum numerical codes, using different approximations for the calculation of atomic structure and the electronic cross-sections. View Full-Text
Keywords: plasma; tungsten; Thomas-Fermi model; equivalent photon flux; plasma oscillations; ionization cross-sections; radiation losses; corona limit plasma; tungsten; Thomas-Fermi model; equivalent photon flux; plasma oscillations; ionization cross-sections; radiation losses; corona limit
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Demura, A.V.; Kadomtsev, M.B.; Lisitsa, V.S.; Shurygin, V.A. Tungsten Ions in Plasmas: Statistical Theory of Radiative-Collisional Processes. Atoms 2015, 3, 162-181.

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