Influence of crystallite size on sputtering coefficients of tungsten bombarded by hydrogen isotopes and argon
Smaev A.V.1, Mikhailov V. S.1, Babenko P. Yu.1, Zinoviev A. N.1
1Ioffe Institute, St. Petersburg, Russia
Email: zinoviev@inprof.ioffe.ru
Using the code we have developed, we obtained for the first time coefficients Y of the tungsten target sputtering by hydrogen isotopes and argon with the bombarding particle energies ranging from 0.01 to 100 keV in dependence on the crystallite size and type of the surface potential barrier. Numerical simulation has predicted that, when energies exceed 100 eV, a significant increase in the sputtering coefficient is observed with increasing crystallite size. The most remarkable growth takes place while the crystallite size increases from one to two lattice constants. A strong influence of the choice of the surface barrier type on the sputtering coefficient calculations has been demonstrated. The results obtained are necessary for analyzing the entry of tungsten impurities into the tokamak plasma hot region. Keywords: sputtering coefficients, interatomic interaction potential, hydrogen isotopes, argon, tungsten, crystallite size.
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