Microwave attenuation of hydrogen plasma in carbon nanotubes

The attenuation (ATT) of hydrogen plasma in carbon nanotubes, grown by iron-catalyzed high-pressure carbon monoxide disproportionate process, is investigated. The effects of the incident wave, the electron density, the collision frequency, the thermal frequency, and the cyclotron frequency on the ATT of the microwave are discussed. Moreover, the impacts of thermal frequency and cyclotron frequency on the ATT are investigated separately. Numerical results indicate that position of the ATT peak and the ATT level depend on the incident frequency, the electron density, the collision frequency, the thermal frequency, and the cyclotron frequency. The results show that the cyclotron frequency highly influences the ATT level. In contrast, the shift frequency is more affected by the thermal frequency. The ATT is more sensitive at the middle band of incident frequency.