The generation of plasma which can absorb microwaves is currently a research topic of interest. This kind of plasma is often produced by the discharge or electron-beam impact of noble gases. In this paper an alternati...The generation of plasma which can absorb microwaves is currently a research topic of interest. This kind of plasma is often produced by the discharge or electron-beam impact of noble gases. In this paper an alternatice approach, combustion plasma, is studied. The plasma is produced by combusting solid grains prepared specially. Six groups of powders were made and used to generate the plasma. The transmissivity of the wave in plasma was measured by employing a microwave scalar network analyser system. In addition, the electron density and the collision frequency of the plasma were examined by microwave double-frequency diagnosis. The measurement results showed that the plasma could absorb microwaves remarkably with an average transmission attenuation being more than 18 dB in a frequency range of 2 GHz to 15 GHz. The diagnosis indicated that the electron density of the plasma varied from 10^17 m^-3 to 10^19 m^-3 and the collision frequency was about 5 × 10^10 s^-1.展开更多
文摘The generation of plasma which can absorb microwaves is currently a research topic of interest. This kind of plasma is often produced by the discharge or electron-beam impact of noble gases. In this paper an alternatice approach, combustion plasma, is studied. The plasma is produced by combusting solid grains prepared specially. Six groups of powders were made and used to generate the plasma. The transmissivity of the wave in plasma was measured by employing a microwave scalar network analyser system. In addition, the electron density and the collision frequency of the plasma were examined by microwave double-frequency diagnosis. The measurement results showed that the plasma could absorb microwaves remarkably with an average transmission attenuation being more than 18 dB in a frequency range of 2 GHz to 15 GHz. The diagnosis indicated that the electron density of the plasma varied from 10^17 m^-3 to 10^19 m^-3 and the collision frequency was about 5 × 10^10 s^-1.
