Observation Of A Significant Drop Of Electron Density In Cascaded Arc Argon Plasma Doped With Oxygen Gas Using Laser Thomson Scattering
PLASMA PHYSICS AND CONTROLLED FUSION(2021)
摘要
In this work, the electron density (n(e)) and electron temperature (T-e) of cascaded arc argon plasma regulated by adding electronegative oxygen gas have been investigated using laser Thomson scattering diagnostic technique. The results indicate that the addition of O-2 gas causes a significant decrease of n(e), which drops from 10(20) m(-3) to 10(17) m(-3). This is mainly attributed to the dissociative recombination reaction between electrons and O-2(+) molecular ions. Meanwhile, the formation of negative ions, O-2(-) and O-, consumes electrons and further makes n(e) decrease. But, T-e remains nearly unchanged with the increase of O-2 ratio from 0% to 10%. This is probably due to that the electron energy loss by the electron collisions with O-2 molecules in the ground state balances the electron heating induced by the super-elastic collisions with the highly vibrational excited O-2 molecules.
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关键词
electron density, electron temperature, cascaded arc Ar, O-2 plasma, laser Thomson scattering
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