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Pumping potential wellsNonmonotonic plasma potential structures are a common feature of many double layers and sheaths. Steady state plasma potential wells separating regions having different plasma potentials are often found in laboratory experiments. In order to exist, such structures all must find a solution to a common problem. Ions created by charge exchange or ionization in the region of the potential well are electrostatically confined and tend to accumulate and fill up the potential well. The increase in positive charge should eliminate the well. Nevertheless, steady state structures are found in which the wells do not fill up. This means that it is important to take into account processes which 'pump' ions from the well. As examples of ion pumping of plasma wells, potential dips in front of a positively biased electro collecting anode in a relatively cold, low density multidipole plasma is considered. Pumping is provided by ion leaks from the edges of the potential dip or by oscillating the applied potential. In the former case the two dimensional character of the problem is shown to be important.
Document ID
19870057867
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Hershkowitz, N.
(Wisconsin Univ. Madison, WI, United States)
Forest, C.
(Wisconsin Univ. Madison, WI, United States)
Wang, E. Y.
(Wisconsin Univ. Madison, WI, United States)
Intrator, T.
(Wisconsin, University Madison, United States)
Date Acquired
August 13, 2013
Publication Date
May 1, 1987
Publication Information
Publication: Laser and Particle Beams
Volume: 5
ISSN: 0263-0346
Subject Category
Plasma Physics
Accession Number
87A45141
Funding Number(s)
CONTRACT_GRANT: NAGW-275
Distribution Limits
Public
Copyright
Other

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