TRIDYN-code

The calculated particle reflection coefficients for nickel with H and Ne" " ion bombardment versus incident energy using the TRIDYN code (Biersack and Eckstein, 1984) are displayed in Fig. 12. The reflection coefficient is rather large... 

Measured sputtering yields for nickel by H" ", Ne" ", and Ni+ ion bombardment versus incident energy are displayed in Fig. 13. Also shown are theoretical calculations based on TRIDYN code (Biersack and Eckstein, 1984) and on the Bohdansky (1984) formula. It is rather obvious that the sputtering yields for the heavier Ne and Ni " projectiles are quite different, both in magnitude and with respect to the position of the maximum, from those with H impact (after Eckstein, 1991). 

To interpret the results the code package TRIDYN + DIFFUSEDC + YCHEM was developed [33]. In TRIDYN H ions were added as additional incident species with fraction h = 75% in the beam. In addition to the inclusion of chemical sputtering by YCHEM (see Sect. 9.3) a concentration dependent diffusion of carbon was added using a diffusion coefficient D(C) as determined from separate experiments [33]. The chemical sputter yield Ychem was taken from literature data and was 10%. In Fig. 9.5 the results of the calculation are compared to experimental data for irradiation of W with CHg at 1000 K [34] and with pure C at 1030 K. The simulations reproduce the experimental values well within the error bars. One can clearly see, that the... 

Fig. 9.5. Erosion of W as function of fluence for the bombardment with C+ and CH3 at 1030 K and 1000 K, respectively. The solid curves give the modeling results using the TRIDYN-DIFFUSEDC-YCHEM code package...

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