Observation of tungsten particles in vacuum arcs by laser induced fluorescence

Author

Nakayama, Yasushi ; Kimura, Toshinori ; Koyama, Kenichi ; Sasao, Hiroyuki

Author_Institution

Adv. Technol. Res. & Dev. Centre, Mitsubishi Electr. Corp., Hyogo, Japan

Volume

27

Issue

4

fYear

1999

fDate

8/1/1999 12:00:00 AM

Firstpage

906

Lastpage

910

Abstract

We have clarified the relation between the decay of tungsten ion density in the vicinity of current zero and vacuum arc mode in high current period by using a laser induced fluorescence method in tungsten vacuum arcs of 60 Hz sinusoidal current with the peak value of 3.3, 6.7, and 9.8 kA. In the case of 6.7 kA, the arc mode was the anode spot mode. Because of the generation of the anode spot, the tungsten ion density near the anode was higher than near the cathode and the density near the anode was about ten times as high as the case of 3.3 kA which was the diffuse mode. In the case of 9.8 kA, which was the intense arc mode, the density near the anode was not significantly different from the case of 6.7 kA. The density near the cathode was higher than near the anode and tungsten ions were observed till about 30 μs after current zero while they disappeared at current zero in the other cases

Keywords

fluorescence; ion density; plasma diagnostics; tungsten; vacuum arcs; 3.3 kA; 6.7 A; 60 Hz; 9.8 A; W; W ion density decay; W particles; anode spot mode; current interruption; current zero mode; diffuse mode; high current period; high speed video camera; intense arc mode; laser induced fluorescence; laser induced fluorescence method; sinusoidal current; tungsten particles; vacuum arc mode; vacuum arcs; vacuum interrupter; Anodes; Cathodes; Electrodes; Fluorescence; Laser excitation; Laser modes; Laser transitions; Particle measurements; Tungsten; Vacuum arcs;

fLanguage

English

Journal_Title

Plasma Science, IEEE Transactions on

Publisher

ieee

ISSN

0093-3813

Type

jour

DOI

10.1109/27.782258

Filename

782258