Other
Scientific paper
Jan 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994phdt........19t&link_type=abstract
Thesis (PH.D.)--THE UNIVERSITY OF IOWA, 1994.Source: Dissertation Abstracts International, Volume: 55-12, Section: B, page: 539
Other
1
Scientific paper
This thesis reports the results of new studies involving laboratory plasma double layers. Filamentary double layers were created in a triple plasma device. The radial size of the current filament, and central plasma column were varied using a variable aperture R _{rm O}. The scaling of the double layer potential drop V_{ rm dl} with the parameter jd ^2, where j is the current density in the double layer and d is the double layer thickness, was determined for several filament radii. For relatively large values of the filament radius, the one-dimensional (Langmuir) scaling was obeyed. For smaller values of the filament radius, the potential drop became less dependent on the parameter jd^2. Langmuir bursts were observed in the high potential region of anode double layers when a sufficient supply of cold electrons was available to make a bump on tail distribution of electrons. The electric fields of Langmuir bursts were determined by observing deflections of a beam from an electron gun. The electric field of the bursts was strong enough to allow for caviton formation and Langmuir collapse. Other properties of the bursts were also recorded, including characteristic frequencies, burst height, width, and time distributions.
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