Structure Modification of Surface of Fine-Grained Graphite and Glassy Carbon under High Power Action by Hydrogen Plasma

Abstract – The studies of exposing of targets by hot-electron plasma exhaust from the multi-mirror trap GOL-3 are carried out. In experiment condi-tions the energy density affected the target placed in facility chamber can be varied within 1– 30 MJ/m 2 per shot. In the paper the results of Raman and SEM studies of surface modification of carbon materials with different ordering range of sp2 fraction (fine-grained graphite and glassy carbon) exposed by hot hydrogen plasma with energy density up to 8 MJ/m 2 are presented. It is shown that on the depth up to ~80 nm due to this exposing there are obtained two effects – micro structural destruction of the surface and extension of crystallite size of sp2 phase, i.e., ordering of nanostructure