space. It will produce at least 285 We at BOM (beginning of mission) from a heat source assembly containing 18 GPHS modules (4410 Wt at BOM). The heat source is surrounded by 572 SiGe thermocouples (unicouples) of the type used in the RTGs on the LES 8/9 and Voyager 1/2 missions. The unicouples are cantilevered from the aluminum alloy generator housing and are surrounded with 60 layers of molybdenum foil/astroquartz fibrous insulation, the MoSi hot shoes are radiatively coupled to the heat source. A gas management system is included to maintain an inert cover gas within the RTG prior to launch and to vent the generator prior to operation in space. The SiGe thermocouples operate between a hot junction of 1000°C and a cold
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