DocumentCode :
3217592
Title :
Formation, propagation, and contraction of the plasma bullets emitted by a pulsed plasma jet
Author :
Begum, A. ; Laroussia, M. ; Karakas, E.
Author_Institution :
Laser & Plasma Eng. Inst., Old Dominion Univ., Norfolk, VA, USA
fYear :
2009
fDate :
1-5 June 2009
Firstpage :
1
Lastpage :
1
Abstract :
Summary form only given. Recently non-thermal atmospheric pressure plasma jets have been playing an important role in plasma processing including biomedical applications [1]. This is due to the ability of providing plasmas not confined by electrodes. In this paper we report experimental investigations on the characteristics of the plasma jet emitted by a pulsed plasma generator, the "Plasma Pencil". To study the formation and the discharge phenomenon of the plasma jet, we investigated the jet initiation point for three different electrodes configurations. The devices were operated by a high voltage pulse generator (up to 10 kV) with variable pulse widths and repetition rate. Using ICCD images we show that the plume is a series of plasma packets/bullets traveling at high velocities. The plasma bullet phenomenon was first observed by Teschke and coAcircnot workers for an RF jet (2005) and Laroussi and co-workers in the case of a nanoseconds pulsed jet (2006) [1]. Correlation between the discharge current and ICCD images reveals when and how the bullets are emitted from the device. The ICCD images of the jet formation point and the discharge current waveform showed that the jet generated in a discharge chamber with dielectric barrier method, begun as a surface discharge around the outlet hole of the barrier and propagated as a surface discharge, maintaining a donut shape. If the high voltage electrode is directly exposed to the ambient gas (no barrier) a filamentary discharge was found responsible for the jet formation and propagation. Depending on the input voltage and the configuration of the discharge chamber, the discharge process could be filamentary or glow-like. Even when the bullet first exhibited a donut shape, it eventually contracted and collapsed to a single head as it propagated away from the device.
Keywords :
discharges (electric); plasma devices; plasma jets; plasma production; ICCD images; atmospheric pressure; dielectric barrier method; discharge current; discharge phenomenon; filamentary discharge; plasma bullets; plasma pencil; plasma processing; pulsed plasma generator; pulsed plasma jet; voltage electrode; Atmospheric-pressure plasmas; Electrodes; Plasma applications; Plasma confinement; Plasma devices; Plasma materials processing; Plasma properties; Pulse generation; Surface waves; Voltage;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Plasma Science - Abstracts, 2009. ICOPS 2009. IEEE International Conference on
Conference_Location :
San Diego, CA
ISSN :
0730-9244
Print_ISBN :
978-1-4244-2617-1
Type :
conf
DOI :
10.1109/PLASMA.2009.5227601
Filename :
5227601
Link To Document :
بازگشت