Thermal evaporated hyperbranched Ag nanostructure as an effective secondary-electron trapping surface coating

摘要: We study secondary electron yield (SEY) suppression of silver using a hyperbranched nanostructure obtained by thermal evaporation. First, we perform evaporation at different residual gas pressures for studying the influence pressure on surface morphologies. A self-assembled Agnanostructure has been achieved 100 Pa. Then, further investigate detailed formation process qualitatively and find it to be dominated “screening effect”. Finally, obvious SEY effect this special structure. show that Pa is best condition within our experimental scope from point view. It exhibits maximum (δmax) ∼0.9. also combining with micro-porous developed before can improve its which leading δmax ∼0.8. propose novel 2D rectangular-hemisphere hybrid trap model numerical simulation dynamics interpretation results. In total, work provides guidance controllable preparation low metallic surfaces potential applications in particle accelerators, RF microwave components satellite systems.