Generation of Microwave Capillary Argon Plasmas at Atmospheric Pressure

A technique has been developed to generate stable Ar plasmas at atmospheric pressure inside of a quartz capillary tube. The microwave plasma in the capillary tube is produced by utilizing a single mode resonant circular cavity applicator with 2.45 GHz frequency excitation. The plasma can be confined...

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Bibliographic Details
Published in:IEEE transactions on plasma science 2016-11, Vol.44 (11), p.2603-2607
Main Authors: Hemawan, Kadek W., Keefer, Derek W., Badding, John V., Hemley, Russell J.
Format: Article
Language:English
Subjects:
Argon
Atmospheric pressure
Carbon
catalysis (heterogeneous), solar (photovoltaic), phonons, thermoelectric, energy storage (including batteries and capacitors), hydrogen and fuel cells, superconductivity, charge transport, mesostructured materials, materials and chemistry by design, synthesis (novel materials)
Cavity resonators
Electromagnetic heating
Electron tubes
emission spectroscopy
Microwave circuits
Microwave imaging
microwave plasma
plasma capillary
plasma jet
Plasma physics
Plasmas
Quartz
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Summary:A technique has been developed to generate stable Ar plasmas at atmospheric pressure inside of a quartz capillary tube. The microwave plasma in the capillary tube is produced by utilizing a single mode resonant circular cavity applicator with 2.45 GHz frequency excitation. The plasma can be confined or fully exposed outside the cavity as plasma jets depending on the operating conditions. The profile of the plasma front has been characterized as a conical tip or split branching jet plume. The measured discharge length and the power density of the plasma range from 6 to 10 cm and 35 to 75 W · cm -3 , respectively. Addition of CH 4 into the Ar plasma results in an increase in the abundances of excited CN and C 2 carbon radicals and a concomitant decrease in the intensity of the Ar emission.
ISSN:0093-3813
1939-9375
DOI:10.1109/TPS.2016.2568038