Journal
PLASMA SOURCES SCIENCE & TECHNOLOGY
Volume 28, Issue 11, Pages -Publisher
IOP Publishing Ltd
DOI: 10.1088/1361-6595/ab4e61
Keywords
carbon dioxide; microwave plasma; contraction dynamics; skin depth; electron density; microwave interferometry; gas conversion
Categories
Funding
- Netherlands Organization for Scientific Research (NWO) [13581]
- Alliander N.V. [13581]
- European Union's Horizon 2020 Research and Innovation Programme [763909]
- H2020 Societal Challenges Programme [763909] Funding Source: H2020 Societal Challenges Programme
Ask authors/readers for more resources
The subatmospheric CO2 microwave plasma is known to contract to a narrow filament with rising pressure as result of a mode transition. This changing state of contraction is investigated in relation to its dielectric properties, in order to directly relate the discharge parameters to the discharge radius. The electron density and gas temperature are measured, respectively, by 168 GHz microwave interferometry and Doppler broadening of the 777 nm oxygen emission lines. The plasma is operated in steady state with 1400 W at 2.45 GHz, between 100 mbar and 400 mbar. Electron density values in the central region range from 10(18) to 10(20) m(-3) between the discharge modes, while the gas temperature increases from 3000 K to 6500 K, in good agreement with previously reported values. Based on the dielectric properties of the discharge in relation to the plasma radius, it is found that the discharge column constitutes a radius of a single skin depth. Implications of these insights on the conditions of previously reported CO2 dissociation experiments are discussed.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available