Abstract
Calculation of heating caused by the deposition of x rays in thin-film optical coatings is complicated because the mean free path of photo- and autoionization electrons is comparable to the thin-film thickness and thus electron deposition cannot be considered local. This paper describes the modeling in the computer code xrth of (a) x-ray deposition and transport, (b) electron production, deposition, and transport, and (c) thermal conduction and transport. X-ray transport is handled by multigroup discrete ordinates, electron transport is done by the method of characteristics, applied to the two-term spherical harmonics expansion approximation (P1) to the Spencer–Lewis transport equation, and thermal transport is computed by a Richardson extrapolation of a backward Euler solution to the heat conduction equation. Results of a few test cases and comparisons with other computer codes are presented.
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