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A design approach for improving the performance of single-grid planar retarding potential analyzers
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10.1063/1.3533657
/content/aip/journal/pop/18/1/10.1063/1.3533657
http://aip.metastore.ingenta.com/content/aip/journal/pop/18/1/10.1063/1.3533657

Figures

Image of FIG. 1.
FIG. 1.

Data produced by the International Reference Ionosphere for the year 2012. These data are at the geographic equator at 190° longitude at 6:30 p.m. local time each day, in order to highlight the seasonal variations.

Image of FIG. 2.
FIG. 2.

Parameters that define a given grid geometry. The spacing between successive grids is G. The distance between grid wires is S. The depth of the grid wires in the direction normal to the grid plane is D. The thickness of the grid wires in the direction parallel to the grid plane is T.

Image of FIG. 3.
FIG. 3.

Various grid geometries simulated for this study. Panel (a) shows a 50 mesh double-thick grid . Panel (b) shows a single-think 100 mesh grid . Panel (c) shows a quintuple-thick 167 mesh grid . The three panels do not share the same scale but the cubes that make up each geometry represent the same physical volume.

Image of FIG. 4.
FIG. 4.

Simulated I-V curves for the geometries shown in Fig. 4. Panel (a) shows an I-V curve for single-thick 100 mesh gird, panel (b) shows an I-V curve for a double-thick 50 mesh grid, and panel (c) shows an I-V curve for a quintuple-thick 167 mesh grid. Each panel allows comparison of the simulated curve, an ideal curve with the optical grid transparency included, the simulated current loss to the grid, and the simulated current from particle leakage.

Image of FIG. 5.
FIG. 5.

Temperature errors calculated from I-V curve fitting as a function of grid depth and space between grid wires. The units are multiples of wire thickness in the plane of the grid. A positive error denotes the fit producing a value larger than the input value.

Image of FIG. 6.
FIG. 6.

Velocity errors calculated from I-V curve fitting as a function of grid depth and space between grid wires. The units are multiples of wire thickness in the plane of the grid. A positive error denotes the fit producing a value larger than the input value.

Image of FIG. 7.
FIG. 7.

Density errors calculated from I-V curve fitting as a function of grid depth and space between grid wires. The units are multiples of wire thickness in the plane of the grid. A positive error denotes the fit producing a value larger than the input value. Errors are presented as a percentage of the total ion flux expected.

Image of FIG. 8.
FIG. 8.

A graph of aggregate errors produced by combining the errors in temperature, density, and velocity commiserate with their respective importance to the Equatorial Vortex Explorer mission. A value of one denotes a complete inability to make a useful measurement with a given grid geometry while a value of zero indicated the ability to make a perfect measurement with a given grid geometry. The units are multiples of wire thickness in the plane of the grid.

Image of FIG. 9.
FIG. 9.

A line graph of aggregate error as a function of wire spacing showing that the minimum aggregate error occurs at a wire depth of 3 wt and a wire spacing of 8 wt.

Tables

Generic image for table
Table I.

Average mission parameters expected for the Equatorial Vortex Explorer. These conditions define the expected parameter space in which the RPA must operate.

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/content/aip/journal/pop/18/1/10.1063/1.3533657
2011-01-14
2014-04-25
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: A design approach for improving the performance of single-grid planar retarding potential analyzers
http://aip.metastore.ingenta.com/content/aip/journal/pop/18/1/10.1063/1.3533657
10.1063/1.3533657
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