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3 Jul 2006

Volume 89, Issue 1, Articles (01xxxx)

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Appl. Phys. Lett. 89, 011901 (2006); http://dx.doi.org/10.1063/1.2218670 (3 pages)

L. S. Wang, S. Tripathy, B. Z. Wang, J. H. Teng, S. Y. Chow, and S. J. Chua
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Phase effect on flow control for dielectric barrier plasma actuators

K. P. Singh and Subrata Roy

Appl. Phys. Lett. 89, 011501 (2006); http://dx.doi.org/10.1063/1.2218770 (3 pages) | Cited 3 times

Online Publication Date: 6 July 2006

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Active control of flow has a wide range of applications. Specifically, mitigation of detachment due to the weakly ionized gas flow past a flat plate at an angle of attack is studied using two asymmetric sets of electrode pairs kept at a phase lag. The equations governing the dynamics of electrons, helium ions, and neutrals are solved self-consistently with charge-Poisson equation. The eletrodynamic forces produced by two actuators largely depend on the relative phase between the potentials applied to rf electrodes and distance between them. A suitable phase and an optimum distance exist between two actuators for effective separation control.
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52.75.-d Plasma devices
52.30.-q Plasma dynamics and flow
52.25.Fi Transport properties
52.25.Dg Plasma kinetic equations
52.25.Ya Neutrals in plasmas
02.60.Lj Ordinary and partial differential equations; boundary value problems

Electron and metastable state interactions in two-step ionization waves

Nicholas S. Siefert, Brian L. Sands, and Biswa N. Ganguly

Appl. Phys. Lett. 89, 011502 (2006); http://dx.doi.org/10.1063/1.2219982 (3 pages) | Cited 5 times

Online Publication Date: 7 July 2006

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We demonstrate the use of a microwave hairpin resonator to measure the time-dependent, phase-resolved electron number density in ionization waves. Under our argon glow discharge conditions, the instability was caused by two-step ionization; and the wave frequency depended on the volume quenching rate of the metastable states. We measured the 1s5 metastable state density using diode laser absorption. The peak electron number density lagged behind the peak metastable state density by 60°. This phase shift reveals the nonlocal nature of the electron kinetics due to two-step ionization.
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52.25.Jm Ionization of plasmas
52.70.Gw Radio-frequency and microwave measurements
52.70.Kz Optical (ultraviolet, visible, infrared) measurements
52.80.Hc Glow; corona
52.35.Qz Microinstabilities (ion-acoustic, two-stream, loss-cone, beam-plasma, drift, ion- or electron-cyclotron, etc.)
52.25.Fi Transport properties
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