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- W1646188242 abstract "Summary form only given. We have investigated the effect of interactions of weak acoustic shock (<Mach 2) propagation on the shock velocity, shock dispersion, current-voltage modulation and spatially-temporally resolved plasma induced emission in low pressure (5-20 Torr), low current (2 to 10 mA/cm/sup 2/) N/sub 2/ positive column discharges. The acoustic shock impulse was produced by a 40-140 Joule stored energy electric spark discharge. Simultaneous multipoint laser photodeflection measurements of shock propagation local velocity change versus axial distance in the positive column showed that the shock velocity increased with increasing path length. The increase is not only depending on the discharge current density but also on the polarity of the applied electric field. These observations suggest the shock speed increase may involve relatively long range shock-electrostatic-thermal energy exchange through screened Coulomb interactions. Furthermore, the shock wave dispersion and damping for a given gas pressure and discharge current is dependent on the shock amplitude. Similarly, for a given discharge condition, the observed recovery of the shock dispersion in the post discharge region is also dependent on shock amplitude. All these observations can not entirely be explained by axial and radial temperature gradients." @default.
- W1646188242 created "2016-06-24" @default.
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- W1646188242 date "2003-01-22" @default.
- W1646188242 modified "2023-09-27" @default.
- W1646188242 title "Plasma-shock interactions in a low pressure positive column" @default.
- W1646188242 doi "https://doi.org/10.1109/plasma.1999.829320" @default.
- W1646188242 hasPublicationYear "2003" @default.
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