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Time evolution of nanosecond runaway discharges in air and helium at atmospheric pressure
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10.1063/1.4772774
/content/aip/journal/pop/19/12/10.1063/1.4772774
http://aip.metastore.ingenta.com/content/aip/journal/pop/19/12/10.1063/1.4772774
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

(a) Experimental setup for time- and space-resolved fast framing photography; (b) Voltage and current waveforms obtained in He gas at P = 105 Pa with dCA  = 2 cm.

Image of FIG. 2.
FIG. 2.

Different stages of the discharge in air at P = 105 Pa. Times of frames with respect to the onset of light emission: (a) 0.2 ns, (b) 0.9 ns, (c) 1.3 ns, (d) 1.8 ns, (e) 3.6 ns, (f) 8.7 ns, (g) 9.3 ns, (h) 10.7 ns, (i) 13 ns.

Image of FIG. 3.
FIG. 3.

First stage of the discharge development in He gas at P = 105 Pa. Times of frames with respect to the onset of light emission: (a) 0.2 ns, (b) 0.8 ns, (c) 1.4 ns.

Image of FIG. 4.
FIG. 4.

Late discharge stages in He gas at P = 105 Pa. These frames were taken with a ∼10 times lower gain than the frames shown in Fig. 3 in order to refrain from saturation and allow a spatial resolution in the late stages when the CA gap is filled with the plasma. Times of frames with respect to the onset of light emission: (a) 2 ns, (b) 2.2 ns, (c) 2.5 ns, (d) 3 ns, (e) 6.3 ns, (f) 7.5 ns, (g) 9.7 ns, (h) 15.2 ns, (i) 16.7 ns.

Image of FIG. 5.
FIG. 5.

Different forms of discharge channels during 3 ns < τd  < 5 ns with respect to onset of light emission. (a) Single channel bridging the CA gap; (b–e) “simultaneous” presence of channels with and without “hot spots” at the origin; (f) channel “bent” at the cathode vicinity. He gas at P = 105 Pa.

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/content/aip/journal/pop/19/12/10.1063/1.4772774
2012-12-20
2014-04-18
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Time evolution of nanosecond runaway discharges in air and helium at atmospheric pressure
http://aip.metastore.ingenta.com/content/aip/journal/pop/19/12/10.1063/1.4772774
10.1063/1.4772774
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