Electrostatic Charging and Levitation of Helium II Drops |
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Authors: | Joseph J Niemela |
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Affiliation: | (1) Department of Physics, University of Oregon, 97403 Eugene, Oregon, USA |
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Abstract: | Liquid Helium II drops, of diameter 1 mm or less, are charged with positive helium ions and subsequently levitated by static
electric fields. Stable levitation was achieved for drops of order 100–150 micrometers in diameter. The suspended drops could
be translated to arbitrary positions within the levitator using additional superimposed DC electric fields, and also could
be made to oscillate stably about their average positions by means of an applied time-varying electric field. A weak corona
discharge was used to produce the necessary ions for levitation. A novel superfluid film flow device, developed for the controlled
deployment of large charged drops, is described. Also discussed is an adjustable electric fountain that requires only a field
emission tip operating at modest potentials, and works in both Helium I and Helium II. |
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