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Two-dimensional simulation of ac-driven microplasmas confined to diameter cylindrical microcavities in dielectric barrier devices
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10.1063/1.2398024
/content/aip/journal/jap/100/12/10.1063/1.2398024
http://aip.metastore.ingenta.com/content/aip/journal/jap/100/12/10.1063/1.2398024

Figures

Image of FIG. 1.
FIG. 1.

Schematic diagram in cross section (not to scale) of the microcavity plasma device simulated in these studies. The structure is azimuthally symmetric and was varied from . The shaded region at top denotes an upper dielectric boundary for the plasma.

Image of FIG. 2.
FIG. 2.

(Color) Driving voltage (top) and current wave forms for a Ne/7% Xe gas mixture at a total pressure of in a device.

Image of FIG. 3.
FIG. 3.

(Color) Calculated spatial profiles for the (a) electrostatic potential, (b) electron number density , and (c) total ion number density at following the application of the voltage pulses to electrodes and ( is the third voltage crossing in Fig. 2). Since the microcavity is symmetric with respect to any plane containing the axis, only one-half of the microcavity is illustrated here. As in Fig. 2, the pressure of the Ne/7% Xe gas mixture is and the microcavity diameter is . The electron and ion number densities associated with the false color scales of panels (b) and (c), respectively, are given in units of . The potential [panel (a)] is expressed in volts.

Image of FIG. 4.
FIG. 4.

(Color) Calculated profiles similar to those of Fig. 3 but for . The electron and ion number densities associated with the false color scales of panels (b) and (c), respectively, are again expressed in units of .

Image of FIG. 5.
FIG. 5.

(Color) Data similar to Figs. 3 and 4 but for . The particle densities are given in units of .

Image of FIG. 6.
FIG. 6.

(Color) Potential and charged particle (electron and ion) densities, shown in panels (a)–(c), respectively, and calculated for the same conditions as those of Figs. 3–5 except that .

Image of FIG. 7.
FIG. 7.

Current wave forms calculated for three values of the microcavity diameter (, 200, and ) with the pressure of the Ne/7% Xe mixture fixed at . The dashed lines represent the voltage wave forms applied to the two device electrodes, and the curves are intended as a guide to the eyes.

Image of FIG. 8.
FIG. 8.

Spatially resolved profiles for the electron density produced in (a) , (b) , and (c) diameter microcavities containing a Ne/7% Xe mixture at a pressure of . For each value of , results are given for three times following the initiation of the voltage pulse (in the interval ). Notice that the units for the ordinate are because the electron density at each value of has been integrated along the axis of the microcavity.

Image of FIG. 9.
FIG. 9.

(Color) Predicted behavior of devices for Ne/7% Xe gas pressures in the range: (a) Current wave forms, (b) radial variation of the electron density (integrating along the microcavity axis) when the discharge current is 10% of its peak value, and (c) radial profiles of corresponding to maximum discharge current.

Image of FIG. 10.
FIG. 10.

(a) Temporal and (b) spatial profiles of the electron density in microplasma devices in which is fixed at . The voltage wave forms responsible for the profiles in part (a) are the same as those of Figs. 2 and 7.

Tables

Generic image for table
Table I.

Calculated average current density, total power deposited, and specific power density (loading) for Ne/7% Xe microplasmas in cylindrical cavities with a diameter of 100, 200, or . The values shown were calculated for a total gas pressure of , and pulsed voltage wave forms in which a constant value of is maintained between the and electrodes for .

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/content/aip/journal/jap/100/12/10.1063/1.2398024
2006-12-19
2014-04-19
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Two-dimensional simulation of ac-driven microplasmas confined to 100–300μm diameter cylindrical microcavities in dielectric barrier devices
http://aip.metastore.ingenta.com/content/aip/journal/jap/100/12/10.1063/1.2398024
10.1063/1.2398024
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