7-38. Solar concentrator SPS rotating machinery momentum effects on uncontrolled attitude........................... 7-83 7-39.9 dB, 1 km transmit antenna..................................................... 7-86 7-40. Structural module and assembly buildup from common structural element.................................................. 7-89 7-41. Structural system thermal environment .............................. 7-91 7-42. Structural temperature versus waste heat............................. 7-93 7-43. Waste heat energy profile........................................................... 7-93 7-44. Cool-down rate in Earth1 s shadow.......................................... 7-94 7-45. Klystron and amplitron vacuum devices ............................. 7-96 7-46(a). Plot of rj/l-i) for efficiencies ranging from 8-0 to 90 percent ..................................................... 7-98 7-46(b). Klystron differential efficiency relative to an 85 percent efficient amplitron.................................................. 7-98 7-47. Microwave antenna subarray..................................................... 7-99 7-48. Microwave power transmission system phase front control concepts..................................................... 7-101 7-49. Microwave power transmission system phase front control concepts..................................................... 7-102 7-50. SPS microwave power transmission system........................ 7-104
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