Measurements of the motion of filaments in a plasma ball

Campanell, M. D.; Laird, J. N.; Provost, T.; Vasquez, S. W.; Zweben, S. J.
May 2010
Physics of Plasmas;May2010, Vol. 17 Issue 5, p053507
Academic Journal
Measurements were made of the motion of the filamentary structures in a plasma ball using high-speed cameras and other optical detectors. These filaments traverse the ball radially at ∼106 cm/s at the driving frequency of ∼26 kHz and drift upward through the ball at ∼1 cm/s. The number of filaments and their radial speed increase approximately linearly with the applied voltage above some threshold. A custom plasma ball was constructed to observe the effects of varying gas pressure, gas species, and electrode properties on the filament structures.


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