Морфология разрушений, образующихся в полиметилметакрилате при облучении сильноточным электронным пучком в режиме филаментации и самофокусировки

Abstract

The morphology of the damage formed in PMMA upon irradiation with a high-current electron beam (Eave. ~ 250 keV, τ1/2.=(2-12) ns) in the filamented and self-focused mode was studied. In the localization zones of the filament in the near-surface region of the samples at a depth of 40 - 80 [mu]m, micro-fractures of a circular and more complex shape were found, the diameters of which vary from 1 to 50 [mu]m. The destruction is interconnected by electric breakdown channels. It is assumed that this type of destruction is formed as a result of irradiation of the polymer with high density electron microbeams, which are formed in the vacuum diode of a pulsed high-current electron accelerator.