Papers by Keyword: Electron Avalanche

Abstract: The influence of microwave irradiation (9.4 GHz) and electron beam (250 keV) on metal aluminum content in aluminum nanopowder is studied. It is established that after irradiation the content of metal aluminum in Al nanopowder increases. The most likely explanation is the reduction of aluminum ions Al³⁺ in the oxide shell at the surface of aluminum nanoparticles to produce metal.

Abstract: The gas electron multiplier (GEM), placed in the drift volume of a conventional gas detector, is a conceptually simple device for producing a large gas gain by concentrating the drift electric field over a very short distance to the point that electron avalanching occurs. This device consists of a thin insulating foil of several tens of μm in thickness, covered on each side with a thin metal layer, with tiny holes, usually 100 μm or less in diameter, and with a spacing of 100-200 μm through the entire foil, perforated by using chemical etching or high-powered laser beam technique. In this study, we have investigated its operating properties with various experimental conditions and demonstrated the possibility of using this device as a digital X-ray imaging sensor, by acquiring X-ray images based upon the scintillation lights of the GEM with a standard CCD camera.