Although the materials and electrical problems associated with the development of the microwave system, particularly in the case of the spaceborne power-transmitting antenna and its control system are considered formidable, we feel they are solvable on the basis of known physical sciences. Thus, we feel that engineering, research, and development, rather than any scientific breakthrough, represent the keys to their solution. 2 . Recommendations. — The technologies for microwave power generation, transmission, rectification and control from synchronous orbit to the Earth will require: • Demonstrations of high efficiency for dc-to-dc power transmission; • Investigation of approaches to implementing the adaptive array principle; • Design construction and evaluation of an Amplitron with associated filtering, and • Definitive illumination pattern investigations. We recommend that the Amplitron (~5 KW) be investigated further as the device capable of converting de to microwave energy, because of the simplicity and long life inherent in the pure metal cold cathode and its compatibility with simple passive waste heat rejection schemes. b. Solar-Energy Conversion 1. Conclusions. — Design approaches for the solar collector, solar cell blankets, and power collection and distribution methods have been evolved to meet the requirements of the structure and control technique analyses. The possible variation in power output caused by such effects as solar collector and blanket distortions, surface degradation, and attitude control was found to be within design limits. Possible power interruptions caused by meteoroid impacts, shadowing, internal damage, and/or temperature runaway conditions were considered. Based on these considerations, key issues, and performance goals can be established, and for each of the key issues, distinct areas can be identified, development objectives listed, and the approach indicated. The advanced state-of-the-art of photovoltaic solar, energy conversion is indicated by the detailed development programs which can be identified for this portion of the SSPS system. 2. Recommendations. — An integrated technology development and verification program should be undertaken for the SSPS solar energy conversion components and subsystems in conjunction with ongoing or planned NASA and NSF programs. Environmental Issues. - a. Environmental/Ecological Impact 1. Conclusions. — The environmental and ecological impacts of the SSPS include the following:
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