TITLE

Experimental and theoretical study of the properties of plasma containing a hemispherically focused ion beam

AUTHOR(S)
Peterson, J. M.; Oleson, N. L.
PUB. DATE
April 1992
SOURCE
Physics of Fluids B: Plasma Physics;Apr92, Vol. 4 Issue 4, p888
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Argon plasmas were produced in a modified multipole plasma device in which the electrons in the two plasmas were isolated by a hemispherical center grid biased negatively. Whenever ion beams are caused to stream from the driver plasma into the target plasma, an additional cold group of Maxwellian electrons were observed in the target plasma. The objective of this paper is to explore the properties of this double-beam plasma (DP) device. Hopefully, this information would provide a reason for the appearance of the cold electron group. To this end, measurements were made of the ion beam densities, energies, and ion temperatures at various axial distances from the hemispheric’s separating grid. Similarly, movable Langmuir probes and hot emissive probes were used to measure the corresponding electron temperatures, densities, and plasma potentials. All that can be said is that these data would suggest that the additional cold group of electrons could result from the interaction of the ion beam with the target electrons in the path of the ion beam. These cold electrons appear to ride along with the ion beam since they are detected throughout the target plasma, since the cold group of electrons are found everywhere in the target plasma.
ACCESSION #
9832453

 

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