Nanostructured Coatings of Low-Secondary Electron Emission to Avoid Multipactor Discharge in High-Power Microwave Devices

Here we report low secondary electron emission yields of a nanostructured graphite and metal-dielectric composites coatings of high aspect ratio deposited on aluminium substrates. In this work, the reduction of SEY due to charging of dielectric domains embedded in conducting surfaces is also studied. The charging of the dielectric domains of these composites inhibits most of the secondary emission from the surface, which still keeps its conductive properties. The SEY as a function of the primary electron energy curves of the nanostructured coatings show SEY <; 1, therefore, the multipactor discharge is avoided.