Atomic and Surface Physics Data in DEGAS 2
D. P. Stotler, C. F. F. Karney, A. Y. Pigarov, and R. J. Kanzleiter
Princeton Plasma Physics Laboratory
P.0. Box 451
Princeton, NJ 08543

As recent simulations of Balmer- emissions in TFTR have demonstrated[1], a Monte Carlo neutral transport code requires accurate atomic and surface physics data in order to match experimental results. In fact, it is work of this sort which drives the acquisition and incorporation of new data into codes such as DEGAS. For this reason, the mechanisms for handling atomic and surface physics data in DEGAS 2 have been designed to allow the greatest possible flexibility in data formats. As one example we will discuss the treatment of elastic scattering reactions and the way in which the requisite data are represented in DEGAS 2. In the future, even more complicated data formats will be needed[2].

Fortunately in the case of surface physics data a particularly general format and related sampling technique already exists[3]. This five dimensional differential scattering distribution describes the dependence of each surface interaction process (e.g., reflection or sputtering) on incident energy and angle, as well as on the two exiting angles and energy. Details about the surface physics data currently incorporated into DEGAS 2 and the user input required to control them will also be presented.

References
[1] D. P. Stotler, C. H. Skinner, R. V. Budny, and A. T. Ramsey, Bull. Am. Phys. Soc. 40 (1995) 1770.
[2] A. Y. Pigarov, D. P. Stotler, C. F. F. Karney, Bull. Am. Phys. Soc. 40 (1995) 1884.
[3] G. Bateman, PPPL Appl. Phys. Rep. No. 1 (1980).

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