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Electron depletion via cathode spot dispersion of dielectric powder into an overhead plasma
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10.1116/1.4817753
/content/avs/journal/jvsta/31/6/10.1116/1.4817753
http://aip.metastore.ingenta.com/content/avs/journal/jvsta/31/6/10.1116/1.4817753
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

(Color online) Experimental setup with a voltage pulser for initiating cathode spots on the electrode surface and a Langmuir probe to measure plasma parameters.

Image of FIG. 2.
FIG. 2.

(Color online) Electrode voltage (a) and cathode spot current (b) for a typical voltage pulse, resulting in cathode spot formation.

Image of FIG. 3.
FIG. 3.

(Color online) Waveforms shown are: (a) the electrode voltage, (b) cathode spot current, (c) probe voltage, and (d) probe current as a function of time for the case where no powder was present on the electrode surface.

Image of FIG. 4.
FIG. 4.

(Color online) (a) Electrode voltage, (b) cathode spot current, (c) probe voltage, and (d) probe current waveforms as a function of time, typical of cases with dielectric powder present on the electrode surface.

Image of FIG. 5.
FIG. 5.

(Color online) Smoothed electron saturation current (a) and electron depletion percent (b) as a function of time.

Image of FIG. 6.
FIG. 6.

(Color online) Electron depletion percent as a function of the initial overhead plasma electron density.

Image of FIG. 7.
FIG. 7.

(a) Microscope image of the 45 m powder shows particles of similar size, approximately 45 m in diameter. (b) Microscope image of the 0.1 m powder reveals significant particle clumping, forming clumps much larger than 0.1 m in diameter [scale applies to (a) and (b)].

Image of FIG. 8.
FIG. 8.

(Color online) Number of electrons per volume collected by the powder particles as a function of overhead plasma density is approximately constant for all cases.

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/content/avs/journal/jvsta/31/6/10.1116/1.4817753
2013-08-09
2014-04-19
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Electron depletion via cathode spot dispersion of dielectric powder into an overhead plasma
http://aip.metastore.ingenta.com/content/avs/journal/jvsta/31/6/10.1116/1.4817753
10.1116/1.4817753
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