Origin of higher temperatures in multidipolar plasma devices

Knappmiller, Scott; Robertson, Scott
October 2011
Physics of Plasmas;Oct2011, Vol. 18 Issue 10, p100702
Academic Journal
Hot-filament discharge devices with multidipolar surface magnetic fields have densities and temperatures higher than in these devices without multidipolar fields. Probe data show a much higher density of secondary electrons from the wall with multidipolar fields that is best explained by the wall secondaries being confined by the magnetic mirror effect. A relatively simple mathematical model for energy balance shows that the heating of the bulk plasma electrons by collisions with the greater number of secondaries from the wall accounts quantitatively for the increased temperature.


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