Fig. 3. Radiator mass/area vs. temperature. Fig. 4. Radiator mass per unit power vs. temperature. Taussig uses a fixed unit mass per kwth, this is an extremely poor approximation. Figure 3 illustrates the approximate mass per unit area determined by the SPS system studies. This mass increases at higher temperatures because of reduced materials properties. When converted to mass per kwth by the Stefan Boltzmann law, Figure 4 results. (3) Rather assumes a high heat rejection temperature for his selective OPL. The present authors doubt this is realistic, but used his temperature value. (4) The IOPL design, done a la Taussig (2), suffers from low efficiency and low heat rejection temperature. With either an efficiency of .2 (instead of .15) or heat rejection temperature of 420°K it would be in the same cost range as the other laser options. (5) The FEL was assumed to reject heat primarily from the beam collection anode, at the same temperature assumed for the microwave klystrons. If the FEL requires superconductive magnets, significant additional mass and heat
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