(НИЯУ МИФИ, 2017) Sorokin, I.; Marenkov, E.; Nordlund, K.; Eksaeva, A.; Маренков, Евгений Дмитриевич; Сорокин, Иван Александрович
Sputtering of the first wall tokamak materials by low energy of the order of 100 eV but
high fluxes, 1020 cm-2s-1 is one of the main mechanisms responsible for steady-state first wall erosion. At such low energies sputtering occurs due to few-collision cascades. The resulting angular and energy distributions of sputtered particles are different from cosine and Thompson distributions predicted by kinetic theory of cascades valid at larger energies. Experimental data on the distributions for materials and energies of interest are scarce [1]. At the same time experiments at linear plasma devices demonstrated that the distributions play a substantial role in comprehension of the sputtered particles transport in plasma [2]. In this work we develop an experimental procedure for direct measurements of the angular distributions of the sputtered particles and a method for molecular dynamics calculation of them. The proposed simulation procedure accurately accounts for polycrystalline structure of the samples.