TABLE 7-13. SPS CREW FOR GEO OPERATIONS AND MAINTENANCE 7.1. 8 REQUIRED TECHNOLOGY ADVANCEMENTS The technology advancements required to build an SPS solar atray as described herein are indicated by the discussions in subsections 7.1.1 and 7.1. 2 and will be summarized here. Solar cell performance characteristics will need improvement to reach the assumed range of 17 to 19 percent. This improvement must be accompanied by a reduction in mass and radiation sensitivity (particulate radiation), by a reduced power degradation over the operational life, and probably increased cell sizes, although this study has used present cell sizes as the baseline.
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