TITLE

Nonstationarity of diffusion-controlled surface-wave-sustained discharges in a cw regime

AUTHOR(S)
Marinov, K.; Shivarova, A.; Stoev, L.
PUB. DATE
August 2006
SOURCE
Physics of Plasmas;Aug2006, Vol. 13 Issue 8, p082110
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
The theory of the cw regime of maintenance of surface-wave-sustained gas discharges developed up to now is for discharge production at a given frequency. A generalization of this theory is presented here by considering discharge maintenance by a narrow-band signal, the actual situation in the experiments. Discharge production in a diffusion-controlled regime is treated within the fluid plasma theory. The set of the equations is for the interrelated variations along the discharge length of the time-dependent envelope of the electric field maintaining the plasma and for the time-dependent plasma characteristics (plasma density, electron temperature, power Θ absorbed on average by an electron). The numerical results presented for the time-space variations of wave-field amplitude and plasma density describe the nonstationary state of the cw regime of discharge maintenance. Detailed analysis with deterministic signals (Gaussian and super-Gaussian pulses) superimposed on a stationary cw-power level demonstrate different types of nonlinear effects—self-steepening and spontaneous modulation near the pulse edge—which are reminiscent of phenomena known from the nonlinear optics. The results for discharge maintenance by a high-frequency power modulated by a narrow-band low-amplitude Gaussian noise are discussed in terms of discharge stability/instability. Relevance to experimental finding in surface-wave-sustained discharge is commented on.
ACCESSION #
22257112

 

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