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7 Mar 2005

Volume 86, Issue 10, Articles (10xxxx)

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Appl. Phys. Lett. 86, 103102 (2005); http://dx.doi.org/10.1063/1.1875734 (3 pages)

Tadashi Kawazoe, Kiyoshi Kobayashi, and Motoichi Ohtsu
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Increased atomic hydrogen flux from a cascaded arc plasma source by changing the nozzle geometry

P. Vankan, R. Engeln, and D. C. Schram

Appl. Phys. Lett. 86, 101501 (2005); http://dx.doi.org/10.1063/1.1879112 (3 pages) | Cited 10 times

Online Publication Date: 1 March 2005

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A very high flux of hydrogen atoms with energies in the eV range has been obtained by using a thermal plasma source and by optimization of the nozzle exit geometry. It proves that the flux of hydrogen atoms emerging from a cascaded arc plasma source depends strongly on the geometry of the nozzle. By decreasing the nozzle length by a factor 2, the atomic hydrogen flux is increased by a factor of 13, and a further increase of a factor of 2.5 can be obtained by increasing the nozzle diameter. The resulting atomic hydrogen flux is 1.2×1021 s−1, corresponding to a dissociation degree of over 30%. It is argued that the main loss channel for atomic hydrogen is surface recombination, and that by using nozzle geometries that reduce the surface loss, the atomic flux is increased.
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52.30.-q Plasma dynamics and flow
52.50.Dg Plasma sources
52.25.Fi Transport properties
52.25.-b Plasma properties
52.40.Hf Plasma-material interactions; boundary layer effects

Flow actuation using radio frequency in partially ionized collisional plasmas

Subrata Roy

Appl. Phys. Lett. 86, 101502 (2005); http://dx.doi.org/10.1063/1.1879097 (3 pages) | Cited 19 times

Online Publication Date: 3 March 2005

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We present a multidimensional theoretical model for a better understanding and the design of the dielectric barrier discharge-induced momentum exchange. Specifically, the formulation is used to predict surface discharge using two-dimensional asymmetric electrode configurations. Model predictions for charge densities, the electric field, and gas velocity distributions are shown to mimic trends reported in the experimental literature. We also predict the electron charge accumulation on the dielectric surface self-limiting the discharge.
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52.30.-q Plasma dynamics and flow
52.80.Pi High-frequency and RF discharges
52.25.Mq Dielectric properties
52.65.-y Plasma simulation
52.20.Fs Electron collisions
52.25.Jm Ionization of plasmas
52.25.Fi Transport properties
52.25.Ya Neutrals in plasmas
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