SURFACE MODIFICATION OF GRAPHITE TARGETS BY INTENSE PULSED ION BEAM IRRADIATION

摘要

High-density, high-pressure ablation plasma produced by intense pulsed ion beam has been used to modify the graphite target surface. The graphite targets were irradiated by 60 - 100 J/cm2 of ion beam. The behavior of ablation plasma was observed by high-speed photography. The kinetic energy of the carbon atoms in the plasma was estimated to be 14 eV/atom at the 100 J/cm2 of ion beam irradiation. Structure of the irradiated targets was investigated by Raman spectroscopy and X-ray diffractometry. We found that either graphite structure or crystallite size in the targets was changed by the ion beam irradiation.