Mon. 20 October 2003 SO/EUS Proto-consortium Meeting Mechanical Design Dr Douglas Griffin 1 Solar Orbiter Extreme Ultaviolet Spectrometer Conceptual Mechanical Design Layout Dr Douglas Griffin

Mon. 20 October 2003 SO/EUS Proto-consortium Meeting Mechanical Design Dr Douglas Griffin 2 Principal Requirements Withstand launch loads Maintain optical alignment Withstand thermal environment Meet mass budgets

Mon. 20 October 2003 SO/EUS Proto-consortium Meeting Mechanical Design Dr Douglas Griffin 3 Material Selection Creep Moisture sensitivity Outgassing properties Maximum working temperature CTE Compatibility with other materials Radiation harness Degradation

Mon. 20 October 2003 SO/EUS Proto-consortium Meeting Mechanical Design Dr Douglas Griffin 4 CeSiC Manufacturing Felt of randomly orientated Carbon Fibres Impregnated with Phenolic resin and moulded into a blank at high pressure Vacuum heated to 1000ºC to pyrolize non-carbon components Reheated to 2100ºC to turn blank into graphite to produce the green body The green body is machined to the desired shape –Stiffening ribs –1mm wall thicknesses Green bodies glued together with Phenolic resin to form a larger composite green body Green body is infiltrated with molten Silicon at 1600ºC and furnace cooled Resulting structure is monolithic and isotropic Feature tolerances ± 10  m Can be EDM machined after structure has been manufactured

Mon. 20 October 2003 SO/EUS Proto-consortium Meeting Mechanical Design Dr Douglas Griffin 5 SO/EUS Structural Concept S/C Sunshield S/C Bus EUS

Mon. 20 October 2003 SO/EUS Proto-consortium Meeting Mechanical Design Dr Douglas Griffin 6 SO/EUS Structural Concept S/C I/F (Thermal and Structural Isolation) No pointing ! Primary Radiator c/w Heat pipe condenser EUS Aperture Detector radiator

Mon. 20 October 2003 SO/EUS Proto-consortium Meeting Mechanical Design Dr Douglas Griffin 7 SO/EUS Structural Concept Cross braces for torsional stiffness Thin panels with stiffening ribs Heat pipe flexible link

Mon. 20 October 2003 SO/EUS Proto-consortium Meeting Mechanical Design Dr Douglas Griffin 8 SO/EUS Structural Concept Detectors + Electronics M1 Slit AssemblyHeat Shield Grating

Mon. 20 October 2003 SO/EUS Proto-consortium Meeting Mechanical Design Dr Douglas Griffin 9 SO/EUS Structural Concept Detectors + Electronics Beams up to the slit Slit Assembly Grating

Mon. 20 October 2003 SO/EUS Proto-consortium Meeting Mechanical Design Dr Douglas Griffin 10 SO/EUS M1 Structural Concept M1Heat pipe Evaporator Thermally isolating actuated mounts Cold plate (Aluminium) Cold fingers

Mon. 20 October 2003 SO/EUS Proto-consortium Meeting Mechanical Design Dr Douglas Griffin 11 SO/EUS Slit Heat interceptor Slit mount Beams from M1 Incident beams

Mon. 20 October 2003 SO/EUS Proto-consortium Meeting Mechanical Design Dr Douglas Griffin 12 Future work Trade-off studies –Materials –Layouts Requirements