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Radio-frequency discharges are known to operate in two different regimes. The alpha regime of low current density and the gamma regime with higher current density. Our recent simulation results suggest that the formation of filaments observed in an atmospheric pressure argon discharge under RF excitation could be triggered by the regime transition(More)
Over the past decade, tremendous progress has been made in the modeling of nonthermal plasmas, and models have now reached the point that they are being used to help guide the experimental optimization of plasma based devices. In this communication we provide an overview of models used to describe nonthermal plasma generated in glow discharges. We show(More)
Hall effect thrusters (HETs) are ion sources used for satellite station keeping and orbit raising. In Single Stage HETs, the same electric field is responsible for electron heating and ion acceleration. We present a new HET concept where ionization and acceleration are separated in two different stages. This double stage HET allows for a more versatile(More)
A miniaturized cylindrical Hall thruster (CHT) is studied using a 2-D hybrid model. The simulation results are compared with experimental results for 100-W laboratory CHT. The channel of this thruster has a short coaxial part and a longer cylindrical region with a larger volume-to-surface ratio to reduce erosion. The 2-D model combines a fluid description(More)
Reported here are results of a collaborative theoretical and experimental effort to develop useful predictive models of the hollow cathode processes that occur in the pseudospark and back-lighted thyratron. During pulsed operation there are several sequentid modes of cathode behavior. High current (=2-100 kA) transport occurs during a highly emissive, or(More)
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