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The electron current to a Langmuir probe in a flowing high-pressure plasma

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2 Author(s)
C. S. MacLatchy ; Dept. of Phys., Acadia Univ., Wolfville, NS, Canada ; H. C. L. Smith

The electron current to a Langmuir probe in a moving high-pressure plasma has been measured and analyzed. The plasma is an atmospheric-pressure propane flame, and the probe's speed relative to the plasma was varied from 10 ms-1 to 30 ms-1. The current is linearly dependent on the speed and appears to be comprised of two components-one driven by diffusion and the other by convection. A model is devised which can be used to measure the electron density. By comparing the density computed from this model to that measured from the ion current, it has been possible to measure the electron mobility in the flame gases. The value obtained by the authors is in good agreement with theoretical calculations found in the literature

Published in:

IEEE Transactions on Plasma Science  (Volume:19 ,  Issue: 6 )