SPS Built of Lunar Material SRA Report for SSI

Cover	1
Table of Contents	3
Foreward	5
1. Executive Summary	7
1.1 Summary of Results	8
1.1.1 Solar Power Conversion Systems	10
1.1.1.1 Silicon Planar	11
1.1.1.2 Gallium Arsenide Concentrator	12
1.1.1.3 Thermophotovoltaic (TPV)	12
1.1.1.4 Brayton Cycle	12
1.1.1.5 Rankine Cycle	13
1.1.1.6 Stirling Cycle	13
1.1.1.7 Concentrating Reflectors	13
1.1.1.8 Radiator Systems	13
1.1.2 Structural Material	13
1.1.3 Power Distribution	14
1.1.3.1 Main Buses	14
1.1.3.2 DC-DC Converters	14
1.1.3.3 Energy Storage	14
1.1.3.4 Electrical Slipring	14
1.1.4 Microwave Transmitter	15
1.1.4.1 RF Amplifiers	15
1.1.4.2 Waveguides	15
1.1.4.3 Microwave Lens	15
1.2 REFERENCES	16
2. Solar Power Conversion Systems	17
2.1 Silicon Planar	19
2.1.1 Introduction	19
2.1.2 Design Description	19
2.1.3 Design Summary	22
2.1.4 Silicon Planar Technical Discussion	23
2.1.4.1 Cell Efficiency Modifiers	23
2.1.4.2 Silicon Solar Calls	24
2.1.4.3 Silicon Planar Dimensions and Masses for a 5 GW SPS	25
2.1.4.5 System Performance	26
2.1.4.6 Mass Analysis	26
2.1.5 Silicon Planar References	27
2.2 Gallium Arsenide Concentrator System	28
2.3 Theremophotovoltaic (TPV) Conversion	38
2.3.1 TPV Design Summary	38
2.3.2 TPV Design Description	39
2.3.3 TPV Technical Discussion	40
2.3.4 TPV References	44
2.4 Braytom Cycle	45
2.4.1 Introduction	45
2.4.2 Design Description	45
2.4.3 Brayton Cycle Technical Discussion	49
2.4.3.1 Radiator	49
2.4.3.2 Concentrator	49
2.4.3.3 Heat Absorber	52
2.4.3.4 Turbomachinery	55
2.4.3.5 Recuperator/Cooler	56
2.4.3.6 Primary Structure	56
2.4.4 Brayton Cycle References	57
2.5 Rankine Cycle	58
2.5.1 Introduction	58
2.5.2 Design Description	59
2.5.3 Design Summary	60
2.5.4 Rankine Cycle Technical Discussion	62
2.5.4.1 Radiator	62
2.5.4.2 Concentrator	63
2.5.4.3 Heat Absorber	63
2.5.4.4 Turbomachinery	64
2.5.4.5 Recuperator/Cooler	64
2.5.4.6 Primary Structure	65
2.5.4 Rankine Cycle References	65
2.6 Stirling Engine	66
2.6.1 Introduction	66
2.6.2 Design Description	67
2.6.3 Design Summary	67
2.6.4 Stirling Technical Discussion	68
2.6.5 Stirling Engine References	71
2.7 Concentrating Reflectors	72
2.7.1 Design Description	72
2.7.2 Concentrating Reflector Reference	72
2.8 Radiator Systems	73
2.8.1 Heat Pipe Radiator (HPR)	73
2.8.2 Liquid Droplet Radiator (LDR)	73
2.8.3 Moving Belt Radiator	74
2.8.4 Radiator Systems References	74
3. Structure	75
3.1 Introduction	75
3.2 Design Alternatives	75
3.3 Selected Design	76
3.4 Design Summary	78
3.5 Passive Thermal Control	79
3.6 Structural and Thremal References	81
4. Power Distribution System	82
4.1 Main Bus	82
4.2 Switchgear	82
4.3 Voltage Conversion	83
4.4 Energy Storage	83
4.5 Electrical Rotary Joint	84
4.6 Power Distribution References	85
5. Microwave Subsystems	86
5.1 Gyrocon	88
5.2 Klystron	89
5.3 Magnetron	90
5.4 Microwave Lens	92
5.5 Microwave Transmission References	95
6. Estimated Mass Statement For 5 GW SPS	96
6.1 General Assumptions	96
6.2 Explanations of Subsystem Mass Statements	96
6.3 References For Estimated SPS Mass Statement	100
7. Conclusions & Recommendations	101
7.1 Conclusions	101
7.2 Recommendations	102
List of Acronyms & Abbreviations	103
SPS Illustration	104

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