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- W2014126091 abstract "It is shown that conventional, ad hoc approximations to the charge exchange kernel employed in rapid neutral transport calculations in plasmas violate important symmetry properties of the original kernel and yield an incorrect asymptotic spectral distribution. An alternative systematic scheme of approximation and modeling is proposed that even to zeroth order yields a more accurate representation of the kernel. The approximation retains important features of the original kernel and is computationally appealing. A variational principle is developed for the particle albedo and average emergent neutral energy from a half-space plasma, which allows extensive numerical comparisons of the various charge exchange models. Exact Monte Carlo results are also presented for a special case to assess the relative accuracy of the models. The results indicate that the proposed new model is twice as accurate as the conventional model for the albedo, although the magnitude is probably acceptably accurate for all models. However, the proposed model can be significantly more accurate than the ad hoc models in predictions for the average emergent energy. The origin of this discrepancy is traced to the original inconsistency in the approximation to the kernel." @default.
- W2014126091 created "2016-06-24" @default.
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- W2014126091 date "1987-03-01" @default.
- W2014126091 modified "2023-09-27" @default.
- W2014126091 title "Neutral transport in plasmas with velocity dependent charge exchange collision frequency" @default.
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- W2014126091 doi "https://doi.org/10.1063/1.866336" @default.
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