B. Alternate Technologies In consideration of the above technology advancement requirements, it is appropriate to identify alternative technology options available to reduce program risk. The major alternatives and options are summarized below according to system element. 1. Microwave Power Transmission o Use of amplitrons, magnetrons, or solid state RF generators in lieu of klytrons. 2. Solar Arrays o Use of amorphous silicon, high efficiency cadmium sulfide, or other potentially low cost solar cells. o Development of thermal engine systems such as the potassium Rankine cycle and Brayton cycle for use in lieu of solar photovoltaics. Focus on lightweight radiators and leak-tight joints for fluid system. 3. Materials o Use of aluminum structure with thermal distortion stabilizing design features for transmit antenna and/or solar array. 4. Space Transportation o Single-stage-to-orbit booster in lieu of two-stage vertical booster (HLLV).
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