Anode fall as relevant to plasma thrusters

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May 3, 2012 | History

Anode fall as relevant to plasma thrusters

The behavior of the electric field together with the electron and ion densities in the vicinity of a non-emitting, plane anode is investigated. The selected approach involves non-linear analysis techniques on the continuum equations for steady-state, isothermal conditions where both ionization and two- body recombination are included. Ions, created through electron bombardment of neutral atoms, are repelled toward two stagnation regions: within or near the sheath boundary and near the plasma interface. These equilibria form as a result of the chemistry present: recombination establishes the latter while ionization stipulates the former. As presented, the sheath is fundamentally unstable - ions are driven toward the negative electrode. Using nitrogen data for a numeric example, the following observations are made: a sufficiently strong applied electric field pushes the ion density toward that of the electrons through a well - a constrictive phenomenon. Both a transition region, dominated by density gradients, and a diffusion-driven zone are found to move the system toward the plasma interface. The characteristics of this process are influenced by the applied electric field, but the instability of the chemistry-induced stagnation regions precludes numeric convergence. Insufficient dissipation may prevent the stability of the anode fall model as presented. Suggested improvements to the model descriptions include considering the effects of temperature gradients, magnetic fields, three-body recombination, diffusion written in terms of the electric field, multi-dimensionality and/or time-dependencies.

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Edition Availability
Cover of: Anode fall as relevant to plasma thrusters
Anode fall as relevant to plasma thrusters
1997, Naval Postgraduate School, Available from National Technical Information Service
in English

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Book Details


Edition Notes

Thesis advisors, Oscar Biblarz, Christopher L. Frenzen.

Thesis (Degree of Aeronautical & Astronautical Engineer and M.S. in Astronautical Engineering) Naval Postgraduate School, June 1997.

Includes bibliographical references (p. 103-107)

Also available online.

System requirements: Adobe Acrobat reader.

dk/dk cc:9116 02/04/98.

Published in
Monterey, Calif, Springfield, Va

The Physical Object

Pagination
xviii, 109 p. ;
Number of pages
109

ID Numbers

Open Library
OL25294510M
Internet Archive
anodefallasrelev00horn

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Internet Archive item record

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May 3, 2012 Edited by ImportBot import new book
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