2.2- 10 Temperature and Radiation Effects on Solar Array Performance.................... . . . 42 2.2- 11 Efficiency Versus Thickness (Optimum Conditions) ... 43 2.2- 12 Solar Cell Configurations ................................ 45 2.2- 13 Solar Cell Blanket Configuration ........................ 45 2.2- 14 Vee Trough Solar Cell Reflector System - Concentration Ratio and Dimensions as Function of Reflector Angle . . 47 2.2- 15 Vee Channel Solar Array Concentration Ratio as Function of Misorientation Angle .... . . 48 2.2- 16 Simplified Solar Array Configuration .................... 49 2.2- 17 Panel and Reflector Steady-State Temperatures .... 51 2.2- 18 Microwave Antenna Trunnion Structure Buildup .... 52 2.2- 19 Microwave Antenna Hexagonal Compression Frame .... 52 2.2- 20 Shoe and Slip Ring Drive Assembly........................ 53 2.2- 21 Pickup Shoe............................................ 54 2.2- 22 Solar Array Conductor Network (One Quadrant) .... 57 2.2- 23 Schematic of Solar Array Conductors .................... 57 2.2- 24 System Voltage Drops ............................ 58 2.2- 25 Conductor Cross-Section Area for Each of 4 SPS Modules . 58 2.2- 26 Total Array Conductor Weight of SPS .................... 59 2.2- 27 Conductor Weight ........................................ 59 2.2- 28 Power Distribution Lateral Power Flow .................... 60 2.3- 1 Conceptual Diagram Showing Array and Amplifier Cost Trends Versus Amplifier Size................... 63 2.3-2 Simplified Diagram of Klystron Mod-Anode and Beam Power Requirements........................ 64 2.3-3 PPM/PM High-Efficiency Klystron CW Amplifier .... 66 2.3- 4 Microwave Energy Conversion Efficiency Chain .... 68 2.3- 5 Efficiency Breakdown - Transmitting Antenna .... 68 3.2- 6 Raytheon MW Subarray Concept ............................ 69 2.3- 7 Typical TE^q SWR Array.................................... 70 2.3- 8 Amplitron Modified Heat Sink............................ 72 2.3- 9 Experimental RCR ........................................ 73 2.3- 10 Radiating Slot Plane (H-Plane) ........................ 74 2.3- 11 Feedline Plane (E-Plane) ................................ 74 2.3- 12 Far-Field Radiation Pattern (10-Square-Meter Subarray) . 75 2.3- 13 10-Square-Meter Element Factor ........................ 75 2.3- 14 RCR Element Maintenance ................................ 76 2.3- 15 Low-Density 10-Square-Meter Subarray .................... 77 2.3- 16 Low-Density 30-Square-Meter Subarray .................... 78 2.3- 17 High-Density 10-Square-Meter Subarray .................... 79 2.3- 18 High-Density 30-Square-Meter Subarray .................... 80 2.3- 19 MW Antenna Modular Sizes ......................................82 2.3- 20 Functional Block Diagram of Hytrodyne Phase Control Network ............................ 84 2.3-21 SPS MPTS Transmit Array Geometry Using Space Feed Reference System.................... 85 2.3- 22 Microwave Power Transmission System .................... 87 2.4- 1 100-cm Ion Thruster Single Cathode Concept .... 89 2.4- 2 Summary of Engine Requirements ........................ 89 2.4- 3 Inert Gas and Tankage Mass................................ 91
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