Intense-Mode Vacuum Arc Characterization by Using 2-D Electron and Vapor Density Image

Shack-Hartmann type laser wavefront sensors were applied to simultaneous single-shot imaging of 2-D electron and copper-vapor density distributions over intense-mode vacuum arc discharges with a pulsed current waveform of 800 A in peak and 24 μs in damping time constant. A parametric analysis of the...

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Bibliographic Details
Published in:IEEE transactions on plasma science 2017-01, Vol.45 (1), p.129-139
Main Authors: Inada, Yuki, Kamiya, Tomoki, Matsuoka, Shigeyasu, Kumada, Akiko, Ikeda, Hisatoshi, Hidaka, Kunihiko
Format: Article
Language:English
Subjects:
Anodes
Arc discharges
Density measurement
Discharge
Electric fields
Electrodes
Fluid mechanics
Ions
plasma density
plasma diagnostics
Plasmas
Sensors
Vacuum arcs
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Summary:Shack-Hartmann type laser wavefront sensors were applied to simultaneous single-shot imaging of 2-D electron and copper-vapor density distributions over intense-mode vacuum arc discharges with a pulsed current waveform of 800 A in peak and 24 μs in damping time constant. A parametric analysis of the ion current based on our experimental results suggested that the intense-mode arcs included highly energetic ions moving from cathodes to anodes with a high velocity of 10 4 m/s and their proportion was larger than or comparable to slow ions with 10 -1 m/s drifted from anodes to cathodes by the electric fields. Furthermore, hydrodynamic calculation demonstrated that the copper vapor in the vacuum plasmas dissipated almost instantaneously in a time scale of ~1 μs and it was not residual metal medium but fresh one continuously supplied from the electrodes.
ISSN:0093-3813
1939-9375
DOI:10.1109/TPS.2016.2635199