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- W82494644 abstract "The use of analytic first collision sources can greatly improve the accuracy of neutral particle S/sub N/ calculations. For electrons, because of the strong anisotropy of the electron scattering kernel, many collisions are required before the flux from a beam source is smooth enough to lend itself to practical numerical treatment. Thus the use of a conventional analytic first collision source is of little value. With smart scattering theory, the true electron scattering law is replaced by an equivalent one that involves many times fewer collisions but larger angular deflections per collision. With such a scattering law, the electron transport emulates that of neutral particles. Hence, application of an analytic first collision source should be effective. However, smart scattering cross sections are defined in terms of a scattering matrix and thus only apply for scatter from one quadrature direction to another. Here, the authors extend the theory to include scatter from (but not to) an arbitrary beam direction. This entails the generation of one additional column S/sup b/ of the smart scattering matrix. The m'th element S/sup b/ of the vector S/sup b/ is a smart cross section for transfer from the beam to direction Omega/sup m/." @default.
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- W82494644 date "1987-01-01" @default.
- W82494644 modified "2023-09-26" @default.
- W82494644 title "Smart first collision sources for electron transport calculations" @default.
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