ILLUSTRATIONS Figure Page 1.1- 1 Study Overview............................................ 2 1.2- 1 SPS Reference Configuration ............................ 4 1.3- 1 Assembly Schedule - Nth Satellite ........................ 7 1.3- 2 Air-Augmented HTO-SSTO Concept ........................ 7 1.3- 3 SPS Cargo Traffic Model Cumulative Cargo Masses to Orbit . 8 1.3- 4 Program Cost Relationships................................ 9 1.3- 5 System Cost by Fiscal Year................................ 10 1.3-6 Future Study Recommendations ............................ 10 2.1-1 SPS Reference Configuration ............................ 12 2.1-2 Configuration Alternatives ................................ 13 2.1-3 SPS Frame Girder Generation Sequence .................... 14 2-1-4 SPS Structural Geometry................................ 15 2.1-5 SPS Satellite Structure................................ 16 2.1-6 Girder Intersection Variations ....................... 16 2.1-7 Beam Interface Attachments................................ 17 2.1-8 Akron and Macon Frame Structure ....................... 18 2.1-9 Akron and Macon Partially Assembled .................... 19 2.1-10 Hindenberg Partially Assembled ....................... 20 2.1-11 Beam Element Section for SPS Array Structure .... 21 2.1-12 Built-up Beam Element Section for SPS Array Structure . . 21 2.1-13 Normalized Sections .................................... 22 2.1-14 Existing MPTS Concepts ... ....................... 23 2.1-15 Structural Concept for Compression Frame/ Tension Web MW Antenna ........... ........ 24 2.1-16 Tension Web/Compression Frame Interface ................ 24 2.1-17 Design Loads ............................................ 26 2.1-18 Compression Frame Analysis Technique .................... 27 2.1-19 Compression Frame Girder Configuration .................... 28 2.1-20 Tribeam Personnel Scooter ................................ 29 2.1-21 Catenary Rope Design .................................... 30 2.1-22 Tension Web Design .................................... 30 2.2-1 SPS Efficiency............................................ 32 2.2-2 Solar Cell Spectral Response Comparisons ................ 35 2.2-3 Typical 1 x 1 cm GaAlAs/GaAs Heteroface Solar Cell ... 36 2.2-4 I-V Characteristics of 1 x 1 cm^ Cell Measured on X-25 Solar Simulator............... 37 2.2-5 Solar Cell Efficiency Projections ........................ 37 2.2-6 Solar Cell Efficiency.................................... 38 2.2-7 Normalized Solar Cell Maximum Power Versus 1-Mev Electron Fluence .................... 39 2.2-8 Fractional Degradation in Short Circuit Current Versus 1-Mev Equivalent Fluence ............ 41 2.2-9 Experimental Radiation Effects Data .................... 41
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