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20 Mar 2006

Volume 88, Issue 12, Articles (12xxxx)

Issue Cover Spotlight Figure

Appl. Phys. Lett. 88, 122510 (2006); http://dx.doi.org/10.1063/1.2186947 (3 pages)

P. Martín Pimentel, S. J. Hermsdoerfer, H. T. Nembach, B. Leven, B. Hillebrands, S. Trellenkamp, and S. Wolff
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Dielectric barrier plasma dynamics for active control of separated flows

Subrata Roy, K. P. Singh, and Datta V. Gaitonde

Appl. Phys. Lett. 88, 121501 (2006); http://dx.doi.org/10.1063/1.2187951 (3 pages) | Cited 6 times

Online Publication Date: 20 March 2006

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The dynamics of separation mitigation with asymmetric dielectric barrier discharges is explored by considering the gas flow past a flat plate at an angle of attack. A self-consistent model utilizing motion of electrons, ions, and neutrals is employed to couple the electric force field to the momentum of the fluid. The charge separation and concomitant electric field yield a time-averaged body force which is oriented predominantly downstream, with a smaller transverse component towards the wall. This induces a wall-jet-like feature that effectively eliminates the separation bubble. The impact of several geometric and electrical operating parameters is elucidated.
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47.85.ld Boundary layer control
47.32.Ff Separated flows
47.65.-d Magnetohydrodynamics and electrohydrodynamics
52.77.-j Plasma applications
52.80.-s Electric discharges
52.25.Fi Transport properties

Threshold laser power density for regime transition of a laser absorption wave in a reduced-density air atmosphere

Koichi Mori, Kimiya Komurasaki, and Yoshihiro Arakawa

Appl. Phys. Lett. 88, 121502 (2006); http://dx.doi.org/10.1063/1.2183812 (3 pages) | Cited 1 time

Online Publication Date: 22 March 2006

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Shadowgraph visualization experiments provide measurements of the threshold laser power density (Sth) for the regime transition of a laser absorption wave generated using a transversely excited atmospheric CO2 pulse laser with various pulse shapes. Results revealed a great influence of the plasma expansion in the direction lateral to the wave propagation on the regime transition by showing that the threshold increased proportionally to the inverse of the beam cross-sectional radius at which the transition occurred (rf,tr): Sth = Cth/rf,tr. The proportionality constant, Cth, was insensitive to air densities of 0.2–1.3 kg/m3.
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52.38.Dx Laser light absorption in plasmas (collisional, parametric, etc.)
52.70.Kz Optical (ultraviolet, visible, infrared) measurements
52.30.-q Plasma dynamics and flow

Production of low-density plasma by coaxially segmented rf discharge for void-free dusty cloud in microgravity experiments

Wataru Suzukawa, Reijiro Ikada, Yasuhiro Tanaka, and Satoru Iizuka

Appl. Phys. Lett. 88, 121503 (2006); http://dx.doi.org/10.1063/1.2187500 (3 pages) | Cited 2 times

Online Publication Date: 23 March 2006

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A technique is presented for producing a low density plasma by introducing a coaxially segmented parallel-plate radio-frequency discharge for void-free dusty-cloud formation. Main plasma for the dusty plasma experiment is produced in a central core part of the parallel-plate discharge, while a plasma for igniting the core plasma discharge is produced in the periphery region surrounding the core plasma. The core plasma density can be markedly decreased to reduce the ion drag force, which is important for a formation of void-free dusty cloud under microgravity.
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52.50.Dg Plasma sources
52.80.Pi High-frequency and RF discharges
52.27.Lw Dusty or complex plasmas; plasma crystals
52.25.-b Plasma properties
52.30.-q Plasma dynamics and flow

Lowering the ignition voltage by the dual microhollow cathode configuration for multichannel flat panel lamp

Tae Il Lee, Ki Wan Park, Sung Won Lee, and Hong Koo Baik

Appl. Phys. Lett. 88, 121504 (2006); http://dx.doi.org/10.1063/1.2189914 (3 pages) | Cited 2 times

Online Publication Date: 24 March 2006

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We have developed a dual microhollow cathode configuration, employing one power supply circuit with a resistor that is suitable for lamp starting without additional power supplier. We also investigated their electrical characteristics and photo images, varying the applied voltage. The electrical and optical measurements showed that the discharge passed through four distinct stages: no discharges, the first microhollow cathode discharges, the both of the first and second microhollow cathode discharges, and finally the main discharge. As a result, the Vs and Es/p of a dual microhollow configuration were lower by a factor of about 2 than those of a diode at 40 Torr. We have also observed that the parallel operation can be possible with a single resistor in nine channels flat panel lamp.
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52.80.Hc Glow; corona
52.70.Ds Electric and magnetic measurements
52.70.Kz Optical (ultraviolet, visible, infrared) measurements
52.75.Fk Magnetohydrodynamic generators and thermionic convertors; plasma diodes
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