Photovoltaic Cells Material « Gallium Arsenide Radius = 6.2 mm Thickness ■ 50 micrometers Insulator/Adhesive Location ■ Back Surface of Photovoltaic Cell Material = Unspecified non-lunar Radius » 6.2 mm Thickness = 25 micrometers 2.2.4.7 Mass Analysis for a Single GaAs Concentrator Unit The densities shown below were assumed to compute the component masses shown in Table 2.2-2. Densities(kg/m3): Aluminum: 2.7E+3 Aluminum Oxide: 3.97E+3 GaAs: 5.32E+3 (2,p305) Fused Silica : 2.2E+3 (17,p68) TABLE 2.2-2 MASS ANALYSIS OF A SINGLE GALLIUM ARSENIDE CONCENTRATOR MASS ITEM (kg) COMPOSITION kg/kW Primary Reflector 2.12E-2 Aluminum 5.25E+0 Secondary Reflector 8.42E-4 Aluminum 2.08E-1 Secondary Supports 1.03E-3 Aluminum 2.55E-1 Tertiary Reflector * 1.35E-3 Aluminum 3.34E-1 High Reflectivity Coating 1.06E-4 Aluminum 2.62E-2 High Emissivity Coating 3.12E-3 Aluminum Oxide 7.72E-1 Glass Cover Plate 5.31E-5 Fused Silica 1.31E-2 GaAs Photovoltaic Cell 3.21E-5 GaAs 7.95E-3 Insulator/Adhesive ** 1.00E-5 Unspecified 2.48E-3 Unit Lunar Mass 2.77E-2 6.86E+0 Unit Non-lunar Mass 4.21E-5 1.04E-2 Total Unit Mass 2.77E-2 6.87E+0 Non-lunar Fraction .0015 * Approximated by a truncated cone ♦* Mass is approximate.
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