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Spark discharge formation in an inhomogeneous electric field under conditions of runaway electron generation
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10.1063/1.3677951
/content/aip/journal/jap/111/2/10.1063/1.3677951
http://aip.metastore.ingenta.com/content/aip/journal/jap/111/2/10.1063/1.3677951
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

(Color online) Images of the discharge with voltage pulse duration of 0.2 ns (a), 2 ns (b) on installation 1, and 40 ns (c) on installation 2. Air gaps: 16 mm (a), 12 mm (b), and 80 mm (c), respectively.

Image of FIG. 2.
FIG. 2.

Emission spectra on installation 2. Applied voltage: −90 kV, air gap: 10 cm (a), 8 cm (b), 3 cm (c), recording time: 100 ms (a) and (b), 10 ms (c), PRF: 1 kHz.

Image of FIG. 3.
FIG. 3.

(Color online) Images of gas discharge plasma glowing in mixtures of nitrogen with 2 Torr CH4. Pressure of nitrogen 0.75 (a), 1 (b), 1.5 (c), and 2 atm (d). Installation 1. Tubular cathode (left)–flat anode (right) distance is 14 mm.

Image of FIG. 4.
FIG. 4.

Emission spectra of spark discharge in air of atmospheric pressure from center of gap. Installation 1; PRF: 1 Hz, gap spacing: 5 mm.

Image of FIG. 5.
FIG. 5.

Emission spectra of spark discharge in air of atmospheric pressure from near cathode part of gap (a) and [spectrum 1 on (b)] on installation 1 (PRF: 1 Hz, air gap: 5 mm), and DC arc discharge with iron electrodes [spectrum 2 on (b)].

Image of FIG. 6.
FIG. 6.

Dependency of time delay of the nitrogen second positive system radiation’s appearance on nitrogen pressure (1) and time delay of the spark radiation’s appearance (2) relative to the discharge current beginning (a). Waveforms of the discharge current (b) and radiation pulse from discharge plasma (c) at nitrogen pressure 3.0 atm. DD–peak corresponding to radiation of the diffuse discharge. SD–peak corresponding to radiation of the spark discharge. Installation 1, gap: 6mm.

Image of FIG. 7.
FIG. 7.

Oscilloscope traces of the discharge current and runaway electron beam current on installation 1 in an air gap of 6 mm.

Image of FIG. 8.
FIG. 8.

(Color online) Applied voltage and current on installation 2. air gap: 10 cm (a), 8 cm (b), 3 cm (c), PRF: 1 kHz.

Image of FIG. 9.
FIG. 9.

(Color online) Discharge emission spectra at different gaps on installation 2. Applied voltage: −90 kV, recording time: 10 ms, air gap: 5 cm, PRF: 1 kHz.

Image of FIG. 10.
FIG. 10.

(Color online) Discharge emission spectra at different PRFs on installation 2. Applied voltage: −90 kV, recording time: 100 ms, air gap: 5 cm.

Image of FIG. 11.
FIG. 11.

(Color online) Images of the discharge in air with leader of spark on installation 2. Applied voltage: −90 kV, air gap: 3 cm, PRF: 1 kHz.

Image of FIG. 12.
FIG. 12.

(Color online) Images of the corona discharge in air at different PRFs on installation 2. Applied voltage: −120 kV, air gap: 20 cm, number of pulses for each image: 50, tubular cathode (left).

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/content/aip/journal/jap/111/2/10.1063/1.3677951
2012-01-23
2014-04-24
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Spark discharge formation in an inhomogeneous electric field under conditions of runaway electron generation
http://aip.metastore.ingenta.com/content/aip/journal/jap/111/2/10.1063/1.3677951
10.1063/1.3677951
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