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Asymptotic theory of double layer and shielding of electric field at the edge of illuminated plasma
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Authors
Advisor(s)
Abstract(s)
The method of matched asymptotic expansions is applied to the problem of a
collisionless plasma generated by UV illumination localized in a central part
of the plasma in the limiting case of small Debye length ${\lambda}_D$. A
second-approximation asymptotic solution is found for the double layer
positioned at the boundary of the illuminated region and for the un-illuminated
plasma for the plane geometry. Numerical calculations for different values of
${\lambda}_D$ are reported and found to confirm the asymptotic results. The net
integral space charge of the double layer is asymptotically small, although in
the plane geometry it is just sufficient to shield the ambipolar electric field
existing in the illuminated region and thus to prevent it from penetrating into
the un-illuminated region. The double layer has the same mathematical nature as
the intermediate transition layer separating an active plasma and a
collisionless sheath, and the underlying physics is also the same. In essence,
the two layers represent the same physical object: a transonic layer.
Description
Keywords
Asymptotic theory Double layer Shielding of electric field Illuminated plasma . Faculdade de ciências Exatas e da Engenharia
Citation
Benilov, M. S., & Thomas, D. M. (2014). Asymptotic theory of double layer and shielding of electric field at the edge of illuminated plasma. Physics of Plasmas, 21(4), 043501.
Publisher
American Institute of Physics