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7 May 2012

Volume 100, Issue 19, Articles (19xxxx)

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Appl. Phys. Lett. 100, 191901 (2012); http://dx.doi.org/10.1063/1.4709436 (4 pages)

Muamer Kadic, Tiemo Bückmann, Nicolas Stenger, Michael Thiel, and Martin Wegener
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Enhanced sheath heating in capacitively coupled discharges due to non-sinusoidal voltage waveforms

T. Lafleur, R. W. Boswell, and J. P. Booth

Appl. Phys. Lett. 100, 194101 (2012); http://dx.doi.org/10.1063/1.4712128 (4 pages) | Cited 6 times

Online Publication Date: 7 May 2012

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Through the use of particle-in-cell simulations, we demonstrate that the power deposition in capacitively coupled discharges (in argon) can be increased by replacing sinusoidal waveforms with Gaussian-shaped voltage pulses (with a repetition frequency of 13.56 MHz). By changing the Gaussian pulse width, electron heating can be directly controlled, allowing for an increased plasma density and ion flux for the same gas pressure and geometrical operating conditions. Analysis of the power deposition profiles and electron distribution functions shows that enhanced electron-sheath heating is responsible for the increased power absorption.
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52.50.Gj Plasma heating by particle beams
52.65.Rr Particle-in-cell method
52.80.-s Electric discharges
52.40.Kh Plasma sheaths

Influence of the nonlinear dynamic plasma screening on the electron-dust collision in dusty plasmas

Dae-Han Ki and Young-Dae Jung

Appl. Phys. Lett. 100, 194102 (2012); http://dx.doi.org/10.1063/1.4709612 (4 pages)

Online Publication Date: 7 May 2012

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The nonlinear dynamic plasma screening effects on the elastic electron-dust grain collision are investigated in dusty plasmas. The results show that the nonlinear dynamic screening effect significantly increases the magnitude of the eikonal phase shift. It is also found that the magnitude of the phase shift decreases with an increase of the thermal energy. In addition, it is found that the differential eikonal cross section shows the oscillatory behavior, and the oscillating peaks approach to the collision center with increasing thermal energy. It is also found that the total eikonal cross section decreases with an increase of the thermal energy.
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52.35.Mw Nonlinear phenomena: waves, wave propagation, and other interactions (including parametric effects, mode coupling, ponderomotive effects, etc.)
52.20.Fs Electron collisions
52.20.Hv Atomic, molecular, ion, and heavy-particle collisions
52.25.Fi Transport properties
52.27.Lw Dusty or complex plasmas; plasma crystals
52.35.Fp Electrostatic waves and oscillations (e.g., ion-acoustic waves)
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A universal noncontact flowmeter for liquids

André Wegfrass, Christian Diethold, Michael Werner, Thomas Fröhlich, Bernd Halbedel, Falko Hilbrunner, Christian Resagk, and André Thess

Appl. Phys. Lett. 100, 194103 (2012); http://dx.doi.org/10.1063/1.4714899 (4 pages) | Cited 1 time

Online Publication Date: 10 May 2012

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Lorentz force velocimetry (LFV) is a noncontact electromagnetic flow measurement technique for liquid metals that is currently used in fundamental research and metallurgy. Up to now, the application of LFV was limited to the narrow class of liquids whose electrical conductivity is of the order 106 S/m. Here, we demonstrate that LFV can be applied to liquids with conductivities up to six orders of magnitude smaller than in liquid metals. We further argue that this range can be extended to 10−3 S/m under industrial and to 10−6 S/m under laboratory conditions making LFV applicable to most liquids of practical interest.
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47.80.-v Instrumentation and measurement methods in fluid dynamics
47.65.-d Magnetohydrodynamics and electrohydrodynamics
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