Production of Charged and Neutral Liquid Helium Drops
We report on two means of producing drops of liquid helium for injection into an apparatus designed to hold individual drops isolated from material walls. Using a small thermomechanical pump operated in a pulsed mode, we have produced uncharged drops of the superfluid; charged drops of both the normal fluid and superfluid have been produced through electrohydrodynamic effects of a sharply pointed conductor within the bulk liquid, which caused charge-carrying drops to be ejected from the liquid surface.
KeywordsLiquid Helium Field Ionization Charged Drop Nozzle Orifice Ionization Electrode
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