Title :
Dust Ejection and Stream Formation via Cathode Spot Ignition at the Surface of a Dielectric-Covered Electrode
Author :
Gillman, Eric D. ; Foster, John E.
Author_Institution :
Dept. of Nucl. Eng. & Radiol. Sci., Univ. of Michigan, Ann Arbor, MI, USA
Abstract :
Cathode spots have been observed to form on an electrode surface covered with dielectric powder when biased at large negative voltages in the presence of a background plasma. The ignition of cathode spots leads to the ejection of the powder particles, which subsequently form dust streams. Particle imaging velocimetry (PIV) techniques are used to track the ejected particles and obtain the distribution of particle ejection velocities.
Keywords :
arcs (electric); cathodes; dusty plasmas; ignition; plasma diagnostics; plasma transport processes; arc discharge; cathode spot ignition; dielectric powder; dielectric-covered electrode surface; dust ejection process; particle ejection velocity distribution; particle imaging velocimetry technique; powder particle ejection process; stream formation process; Cathodes; Cutoff frequency; Dielectrics; Plasmas; Streaming media; Surface treatment; Arc discharges; communication; electric breakdown; imaging; particle tracking; plasmas; space vehicle communication;
Journal_Title :
Plasma Science, IEEE Transactions on
DOI :
10.1109/TPS.2011.2147336
