Electric fields and double layers in plasmas

Details Electric fields and double layers in plasmas Electric fields and double layers in plasmas

May 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987lpb.....5..233s&link_type=abstract

(NASA, Conference on Double Layers in Plasmas, Huntsville, AL, Mar. 1986) Laser and Particle Beams (ISSN 0263-0346), vol. 5, May

Physics

5

Electric Fields, Magnetohydrodynamics, Plasma Currents, Plasma Layers, Plasma Potentials, Current Sheets, Plasma Density, Plasma Generators, Plasma Oscillations

Scientific paper

Various mechanisms for driving double layers (DLs) in plasmas are described, including applied potential drops, currents, contact potentials, and plasma expansions. Somne dynamic features of the DLs are discussed; and it is demonstrated that DLs and the currents through them undergo slow oscillations, determined by the ion transit time across an effective length of the system in which the DLs form. It is shown that a localized potential dip forms at the low potential end of a DL, which interrupts the electron current through it according to the Langmuir criterion whenever the ion flux into the DL is disrupted. Also considered is the generation of electric fields perpendicular to the ambient magnetic field by contact potentials.

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