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4 Apr 2011

Volume 98, Issue 14, Articles (14xxxx)

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Appl. Phys. Lett. 98, 141903 (2011); http://dx.doi.org/10.1063/1.3548546 (3 pages)

H. Hattab, A. T. N’Diaye, D. Wall, G. Jnawali, J. Coraux, C. Busse, R. van Gastel, B. Poelsema, T. Michely, F.-J. Meyer zu Heringdorf, and M. Horn-von Hoegen
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Simulation of streamers propagating along helium jets in ambient air: Polarity-induced effects

G. V. Naidis

Appl. Phys. Lett. 98, 141501 (2011); http://dx.doi.org/10.1063/1.3576940 (3 pages) | Cited 9 times

Online Publication Date: 4 April 2011

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Results of modeling of streamer propagation along helium jets for both positive and negative polarities of applied voltage are presented. Obtained patterns of streamer dynamics and structure in these two cases are similar to those observed in experiments with plasma jets.
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52.80.-s Electric discharges
52.75.-d Plasma devices
52.65.-y Plasma simulation

Time-resolved gas temperature evolution in pulsed Ar–N2 microwave discharge

Nikolay Britun, Thomas Godfroid, Stephanos Konstantinidis, and Rony Snyders

Appl. Phys. Lett. 98, 141502 (2011); http://dx.doi.org/10.1063/1.3576928 (3 pages)

Online Publication Date: 6 April 2011

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Temporal evolution of the gas temperature (Tg) in a pulsed microwave surfaguide discharge is studied by measuring the N2 rotational temperature. We found that at high power applied per pulse, gas temperature grows linearly, and saturates after about 150 μs. This effect is absent at low power values, or at short pulse durations. Observed Tg behavior correlates with time-resolved measurements of the N2 vibrational temperature, as well as with N emission lines. Consequently, Tg time behavior was related to N atoms production in plasma. Using obtained Tg growth rates, the effective power used for plasma heating is determined.
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52.25.Os Emission, absorption, and scattering of electromagnetic radiation
52.80.Pi High-frequency and RF discharges
52.70.Kz Optical (ultraviolet, visible, infrared) measurements
52.50.Sw Plasma heating by microwaves; ECR, LH, collisional heating

Direct thrust measurement of a permanent magnet helicon double layer thruster

K. Takahashi, T. Lafleur, C. Charles, P. Alexander, R. W. Boswell, M. Perren, R. Laine, S. Pottinger, V. Lappas, T. Harle, and D. Lamprou

Appl. Phys. Lett. 98, 141503 (2011); http://dx.doi.org/10.1063/1.3577608 (3 pages) | Cited 8 times

Online Publication Date: 7 April 2011

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Direct thrust measurements of a permanent magnet helicon double layer thruster have been made using a pendulum thrust balance and a high sensitivity laser displacement sensor. At the low pressures used (0.08 Pa) an ion beam is detected downstream of the thruster exit, and a maximum thrust force of about 3 mN is measured for argon with an rf input power of about 700 W. The measured thrust is proportional to the upstream plasma density and is in good agreement with the theoretical thrust based on the maximum upstream electron pressure.
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52.75.Di Ion and plasma propulsion
52.25.-b Plasma properties
52.40.Kh Plasma sheaths
52.70.Gw Radio-frequency and microwave measurements
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