Nano-scale structural features of stratified hydrocarbon films formed at interaction of plasma with surface in T-10 tokamak

Abstract Hydrocarbon flakes (films) with high atomic deuterium to carbon ratio formed at deuterium plasma discharges in T-10 tokamak are non-crystalline. They contain structure defects of cluster type having typical sizes of about 0.23, 0.7, 4 and 12 nm. Structural sp 2 defects: aromatic carbon rings (0.23-0.28 nm) and elements of nanotubes (0.71 nm) were detected on the wall side of flakes and sp 3 clusters – on the plasma side. In situ control of hydrocarbon films growth and hydrogen isotope accumulation by means of FT-IR is proposed. Numerical modeling of X-ray scattering on the flakes using different chaotic ensembles of carbon nanostructures suggests that unusual strong peak of X-ray scattering intensity may be caused by the toroids (toroidal carbon nanotubes) with torus radius of about 1 nm. PACS: 52.55.Fa, 68.55.-a, 33.20.Ea, 61.05.cf JNM keywords : Plasma-Materials Interaction, Hydrogen and Hydrides, Carbon, Surface Effects, X-ray Techniques and Applications