On a dielectric-barrier and a microwave-cavity discharge in synchronized operation—the case of a helium/oxygen mixture

Author： Nikolic M Popovic S Upadhyay J Vuskovic L Leiweke R Ganguly B

ISSN： 0963-0252

Source： Plasma Sources Science and Technology, Vol.21, Iss.1, 2012-02, pp. : 15004-15011

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Abstract

We have investigated the performance of a microwave-cavity discharge (MWD) operating in tandem with a fast rise-time pulsed dielectric-barrier discharge (DBD). The tandem discharge operated in a helium/oxygen mixture, where metastable molecular oxygen could be produced efficiently using MWD in proportionally large quantities (order of 20% of total oxygen number density). In this new arrangement, a DBD operating at high E/N provided a metastables-rich mixture, thereby modifying the discharge kinetics of the MWD, which operated in the E/N range centered around 10 Td. Both discharges operated in synchronized pulse-repetitive mode, which was tailored to maximize the oxygen metastable production efficiency. The system operated at pressures up to 350 Torr with an average power between 3 and 20 W.