Physics – Plasma Physics
Scientific paper
2004-10-22
Physics
Plasma Physics
12th International Congress on Plasma Physics, 25-29 October 2004, Nice (France)
Scientific paper
A high-density magnetized plasma has been studied for understanding of plasma dynamics in partially ionized plasmas. Ion flow field has been obtained experimentally, and is shown to be associated with a vortex formation. The most remarkable result is that the direction of rotation is opposite to that of the ExB drift. Measurement of neutral density profile reveals that there is a steep density gradient of the neutrals around the vortex, suggesting that the generation of inward momentum of the neutrals due to the density gradient. The momentum is transfered to ion with charge-exchange collision, and cause effective force on the ion. The present experiment shows that this effective force may dominate the ambipolar-electric field and drive the anti-ExB vortical motion of ions.
Kado Shinichiro
Kono Mitsuo
Nagaoka Kenichi
Okamoto Atsushi
Tanaka Masayoshi Y.
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