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Ion current density measurements in a copper vacuum arc with different refractory anode thicknesses
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10.1063/1.3686183
/content/aip/journal/jap/111/4/10.1063/1.3686183
http://aip.metastore.ingenta.com/content/aip/journal/jap/111/4/10.1063/1.3686183
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

(Color online) Schematic diagram of the experimental set-up.

Image of FIG. 2.
FIG. 2.

(Color online) Plasma plume photograph in HRAVA at t = 60 s (I = 175 A, h = 10 mm, d = 15 mm).

Image of FIG. 3.
FIG. 3.

(Color online) Typical ion current density waveform (I = 200 A, L i  = 50 mm, h = 10 mm, d = 15 mm, parallel).

Image of FIG. 4.
FIG. 4.

(Color online) Typical ion current density waveform (I = 200 A, L i  = 50 mm, h = 10 mm, d = 15 mm, perpendicular).

Image of FIG. 5.
FIG. 5.

(Color online) Initial time t bp (defined in Fig. 3 ) vs anode thickness with arc current and probe orientation as parameters. (L i  = 110 mm, h = 10 mm).

Image of FIG. 6.
FIG. 6.

(Color online) Characteristic times (defined in Fig. 3 ) for parallel (dashed lines) and perpendicular (solid lines) probe orientations vs anode thickness (I = 200 A, L i  = 110 mm, h = 10 mm).

Image of FIG. 7.
FIG. 7.

(Color online) Steady state ion current with (a) parallel and (b) perpendicular probe orientation vs I (L i  = 110 mm, h = 10 mm).

Image of FIG. 8.
FIG. 8.

(Color online) Steady state ion current with perpendicular (solid markers) and parallel (hollow markers) probe orientation as dependence on L i (d = 15 mm, h = 10 mm).

Image of FIG. 9.
FIG. 9.

(Color online) Ratio of ion current density (J /J // ) measured with perpendicular and parallel probe orientations and the ratio (E i /T e )0.5 obtained using ion energy E i and electron temperature T e in the expanding HRAVA plasma with I = 175 A measured previously (Ref. 8 ).

Image of FIG. 10.
FIG. 10.

(Color online) Steady state ion current density to the perpendicular probe vs anode thickness (h = 10 mm, solid lines I = 150 A, dashed lines I = 200 A).

Image of FIG. 11.
FIG. 11.

(Color online) Normalized (solid curve, independent on I) steady state ion current with perpendicular probe orientation and ion current density calculated using data velocity V and density n from Ref. 8 (dotted curve) as dependence on L i .

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/content/aip/journal/jap/111/4/10.1063/1.3686183
2012-02-22
2014-04-25
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Ion current density measurements in a copper vacuum arc with different refractory anode thicknesses
http://aip.metastore.ingenta.com/content/aip/journal/jap/111/4/10.1063/1.3686183
10.1063/1.3686183
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