system is fail-safe in that the beam would be dispersed to harmless intensity levels should be microwave beam pointing control fail. 17. Implementation of SPS on a large scale would create an increased demand for resources such as aluminum and rocket propellant gases (hydrogen and argon). Also, production capacity would have to be substantially increased in the areas of solar cells and reduction of arsenic from oxides (for the manufacture of gallium arsenide diodes). However, there does not appear to be any critical shortages of resources for SPS construction based on world reserves.
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