Space Power Volume 9 Numbers 2&3 1990

Cover	1
Editors Page	2
Table of Contents	3
Ion Drag on a Highly Negatively Biased Solar Array by Daniel Hastings and Mengu Cho	5
Summary	5
Introduction	5
Ion Drag	6
Interacting Limit	6
Noninteracting Limit	7
Use of a Particle in Cell Code to Simulate Ion Drag	9
Numerical Result	10
Conclusion	16
Acknowledgements	17
References	17
Microwave Energy Transmission Experiment by Matsumoto, Kaya and Nagatomo	19
Summary	19
Introduction	19
METS Experimental Objectives	20
Beam Pointing	20
Microwaves and Plasmas	21
METS System	24
1. Microwave Transmitter (MWT)	24
2. Target Satellite (TGS)	29
3. Diagnostic Package (DGP)	30
Neutral Gas Plume (NGP)	31
METS Experimental Operation	32
1. Preparatory Functional Checkout	32
2. Microwave Beam Control Test (towards TGS)	33
3. Microwave Beam Control Test (Ground Directed)	34
4. Plasma Experiment	34
Summary and Conclusions	35
Acknowledgements	35
References	35
An Experimental Stirling Engine for Use in Space Solar Dynamic Power Systems: Preliminary Tests by Eguchi, Ogiwara and Fujiwara	37
Summary	37
Introduction	37
Description of the NALSEM-125 Engine Model	38
Predictions of NALSEM-125 Engine Performance	40
Engine Components	41
Heat Exchanger	41
Seal Device	41
Linear Alternator	42
Test Procedures	42
Operations and Control	43
Data Reduction	43
Test Results	44
Pressure Variations in the Engine Working Space	44
Thermodynamic Characteristics	45
Dynamic Performance	49
Variations of Helium Gas Temperature	50
Concluding Remarks	51
Acknowledgements	52
Nomenclature	52
References	53
Study of Parabolic Solar Concentrators by Kata, Oda, Takeshita, et al	55
Summary	55
Introduction	55
Conceptual Design of Parabolic Solar Concentrators	55
Basic Assumptions and Requirements	55
Configuration	56
Collector Efficiency and Error Analysis	56
1. Collector Efficiency and Sun Image Size Requirement	57
2. Analysis of Error from Collector	58
Optical Analysis and Design	59
1. Optical Analysis Method	60
2. Parametric Study	61
3. Focal Ratio	61
4. Type of Division	62
5. Specification of Optical Parameters and Collecting Performance	63
Mirror Design	63
Substrate	64
Specular Surface	65
Reflective and Protective Surface	65
Structural Design	67
Mirror Fabrication	67
Conclusions	68
References	68
Space Station Freedom Growth Power Requirements by Meredith, Ahil and Saucillo	69
Summary	69
Introduction	69
Evolution Options	70
Mission Set	70
R&D Analysis	71
Transportation Node Analysis	73
Conclusions/Recommendations	78
References	79
Satellite Attitude Control through Solar Radiation: a New Approach by Krishna Kumar	81
Summary	81
Introduction	81
Formulation	82
Thermal Deflection Analysis	83
Librational Response	84
Attitude Control	86
Concluding Remarks	87
Nomenclature	89
Acknowledgements	90
References	90
High Temperature Superconductivity Technology for Advanced Space Power Systems by Faymon, Myres and Connoly	91
Summary	91
Introduction	91
NASA Missions of the Future	92
HTSC Power Technology Studies	92
Lewis Research Center—Argonne National Laboratory	96
Future Efforts in HTSC at the Lewis Research Center	97
Summary and Conclusions	98
References	99
An Indirect Search for Lunar Polar Ices by Francis Graham	101
Summary	101
Introduction	101
The Role of Secondary Volatiles	103
Experimental Design	105
Results	105
Additional Investigations: Preliminary Results	107
Conclusions	108
Acknowledgements	108
References	109
Overview of CNES-CEA Joint Programme on Space Nuclear Brayton Systems by Carre, Proust, Chaudourne, et al	111
Summary	111
Background and Brief Programme Account	111
Various Candidate Technologies for 20 kWe Nuclear Brayton Power Systems	113
Specifications for the Study	113
Design Features Common to the Systems studied	114
Specific Design Features	115
Design Points	116
Reactor Design	118
Mass Evaluation	120
Power Growth Potential	121
Operating Constraints	122
Safety Aspects	124
Reliability	124
Development Cost and Lead Time	124
Conclusion	125
References	126
Rechargeable Lithium Battery Technology: a Survey by Gerald Halpert and Subbaro Surampudi	127
Introduction	127
Rechargeable Lithium Cell Operation	127
Types of Rechargeable Lithium Cells	128
The Advantages of Lithium Cells	130
Cell Features	131
Organic Electrolyte Cells	131
Polymeric Electrolyte Cells	132
Inorganic Electrolyte	137
Molten Salt Lithium Cells	137
Status of the Technical Issues	139
Cycle Life	139
Charge Control	140
Rate Capability	140
Cell Size	141
Safety	141
The NASA Role for Rechargeable Lithium Cells	142
Conclusion	144
Acknowledgements	144
Referencees	144
SP-100 Power System Development Status by Jack Mondt	147
Summary	147
Introduction	148
Objective	149
Approach	150
Status	150
GFS Description	152
System Status	153
Subsystem Status	155
Reactor Subsystems Status	155
Reactors I&C Subsystems Status	168
Shield Subsystem	169
Heat Transport Subsystem	169
Power Conversion Subsystem	171
Heat Rejection Subsystem	175
Power Conditioning Control and Distribution Subsystem	175
Conclusions	179
References	179
Book Reviews	181
Outer Space: Problems of Law and Policy	181
Lunar Simulant Survey Report	181
Announcements	183
SPS 91 Power From Space Paris	183
The International Association for Solar Energy Education IASEE	185

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