Energy spectra of atoms sputtered during proton bombardment of solid targets
Babenko P. Yu.1, Mikhailov V. S.1, Smaev A.V.1, Zinoviev A. N.1
1Ioffe Institute, St. Petersburg, Russia
Email: babenko@npd.ioffe.ru, chiro@bk.ru, rex.smaev@mail.ru, zinoviev@inprof.ioffe.ru
Such characteristics of sputtered atoms as their average energy and energy spectrum are important for calculating the influx of impurities (in particular the first-wall atoms) into the plasma. In this study, energy characteristics of sputtered atoms were considered for the H-Be and H-W systems. The dependence of average energy of sputtered particles on the collision energy was calculated. Taking into account the energy spectrum of backscattered bombarding ions and analyzing the possible sputtering mechanisms, we succeeded in achieving a good agreement with the results of computer modeling. Keywords: sputtering coefficient, average energy of sputtered particles, ion bombardment, ITER tokamak, beryllium, tungsten.
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