JUICE (Jupiter Icy moons Explorer) Thermal Design and early Thermal Verification
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JUICE - JUpiter ICy moons Explorer - is the first large-class mission in ESA's Cosmic Vision programme. Planned for launch in 2022 and arrival at Jupiter in 2030, it will spend at least three years making detailed observations of Jupiter and three of its largest moons, Ganymede, Callisto and Europa. It addresses the question of whether possible habitats of life are provided underneath the surfaces of the icy satellites and also probes Jupiter’s atmosphere and magnetosphere. One of the main drivers is the low solar illumination received at Jupiter, that drives both the size and technology of the solar arrays, and the thermal control, that is designed to cope with hot and cold environments. JUICE spacecraft thermal control is characterized by several requirements such as a large variations of spacecraft external environment during the mission (Solar constant decreasing from 3342 W/m² closer to Sun than Venus down to 46 W/m² in Jovian environment), high planet flux during Venus flyby and Jupiter - Ganymede combined shadowing which generates long eclipses of up to 4.8 hours. The thermal design objective is then to provide the spacecraft with the flexibility required to achieve its operations throughout the whole range of specified environments and attitudes. The paper will present JUICE thermal control which is designed to minimize the impact of the external environment changes on the spacecraft units and subsystems, to control heat loads/leaks from appendages through high efficiency Multi-Layers Insulation. It will also present JUICE scale 1 Thermal Demonstrator test performed in ESTEC Large Space Simulator early 2018.
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