REFINE PRESENT PRELIMINARY COMPARISONS IN FOLLOWING AREAS: o COST AND RELATED ECONOMIC CONSIDERATIONS o TECHNOLOGY REQUIREMENTS o ENVIRONMENTAL CONSIDERATIONS o SAFETY o LOGISTICS IMPLICATIONS o NATURAL RESOURCE REQUIREMENTS o ENERGY PAYBACK o INTERNATIONAL CONSIDERATIONS o REGULATORY CONSIDERATIONS o INTERFACE WITH PRESENT STRUCTURE Figure X-3.- The relative merits of space solar power and other systems - coal, nuclear, solar terrestrial. o MICROWAVE BEAM - IONOSPHERE INTERACTION TEST - ARECIBO AND POSSIBLY NEW OR MODIFIED SYSTEMS o DEMONSTRATE PHASED-ARRAY CONCEPT - GOLDSTONE o COMPLETE LABORATORY PERFORMANCE EVALUATION OF GaAs SOLAR CELLS o LABORATORY-SCALE TESTING OF IMPROVED HIGH-RATE SOLAR CELL PRODUCTION TECHNIQUES o THERMAL-VACUUM TESTING OF ADVANCED RADIATOR CONCEPTS o DESIGN AND TESTING OF PROTOTYPE SPACE FABRICATION DEVICE o EVALUATION OF GRAPHITE EPOXY CASTINGS o TESTING AND EVALUATION OF MPD AND THERMAL ARC THRUSTERS o PRELIMINARY WIND-TUNNEL TESTING OF CONCEPTUAL LAUNCH, REENTRY, AND LANDING CONFIGURATIONS o COMPLETE INITIAL TESTS OF BIOLOGICAL EFFECTS OF 'HIGH Z' RADIATION o PRELIMINARY TESTS OF MICROWAVE RADIATION ON EQUIPMENT, VEGETATION, AND ANIMALS o THERMAL-VACUUM TESTING OF TYPICAL STRUCTURES 0 ADDITIONAL CRITICAL TEST AS IDENTIFIED IN STUDIES Figure X-4.- Significant test activities, initial phase, July 1976 to July 1978 (partial listing).
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