Search

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.

A resonant microwave pulse compressor with a waveguide H-tee-based interference switch has been studied for its capability to produce output pulses with adjustable power, energy, waveform, and carrier frequency. Output radiation characteristics are controlled by the variation of transition attenuation of the unit of microwave energy extraction. Results of theoretical estimations of the parameters tuning range and experimental investigations of the S-band compressor are presented. The possibility of forming combined pulses comprising a microsecond prepulse and nanosecond main pulse of comparable energies has been demonstrated. It has been shown that such pulses can be applied for finding criteria levels of impact on electronics of a personal computer.