Figure 5. Indirectly Optically Pumped Laser SPS General Arrangement • । ' .1 • i •» I M I\ t Ht AM DUMP Figure 6. 1-GI/V Single-Pass Free Electron Laser SPS Figure 7. Comparison of Laser Options and Reference SPS Concept efficiency, research leading to cells with the desired high efficiencies with little increase in cost and mass is needed. Additional laser systems studies are needed to determine approaches that may lead to reduced mass and cost to make them more competitive with the microwave SPS concepts. In addition, because of the problems related to penetrating heavy cloud layers, total power system integration studies are needed to determine the degree to which a laser system might penetrate the utility network.
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