Stuttgart 2012 – wissenschaftliches Programm
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P: Fachverband Plasmaphysik
P 5: Niedertemperaturplasmen
P 5.5: Vortrag
Montag, 12. März 2012, 15:00–15:15, V57.03
Back and forth directed plasma bullet propagation in a helium atmospheric pressure needle to plane discharge — •Torsten Gerling1, Andrei Vasile Nastuta2, René Bussiahn1, Eckhard Kindel1, and Klaus-Dieter Weltmann1 — 1Leibniz Institute for Plasma Science and Technology (INP Greifswald), Greifswald, Germany — 2Faculty of Physics, Alexandru Ioan Cuza University, Iasi, Romania
A sinusoidal driven needle to plane discharge in flowing helium at atmospheric pressure was investigated by means of electrical and optical measurements. `Bullet-like' behaviour of the discharge was observed and investigated with special interest towards velocities and size. A discharge development within six phases is found. Among these, four types of bullets are observed with respect to the direction of the gas flow and applied voltage polarity. Temporally resolved photography shows the formation of an atmospheric pressure glow discharge subsequently to the propagation of the `forward bullet'. We conclude that the main movement of the bullets in our setup is not depending on the gas flow but on the electrical field direction.