Mission analysis and technical design of a large radiatively cooled telescope for cosmology

Physics – Optics

Scientific paper

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Cosmology, Infrared Telescopes, Mission Planning, Radiant Cooling, Spaceborne Telescopes, Cassegrain Optics, Cryogenic Cooling, Focal Plane Devices, Orbit Calculation, Structural Design, Temperature Control

Scientific paper

The scientific requirements for a space-based telescope to observed small-scale fluctuations (such as the Sunyaev-Zel'dovich effect in the vicinity of galactic clusters) at wavelengths 0.1-2 mm are examined; existing and planned instruments are evaluated; the orbital parameters of an optimized mission are defined; and a new design is proposed. The result is a 10-m-focal-length Cassegrain telescope with a radiatively cooled 1200-mm-diameter Al primary, small cryogenically cooled focal-plane instruments, and an axially symmetrical thermal and structural design to limit the optics gradients to 30 mK. Drawings, diagrams, graphs, and tables of instrument parameters are provided.

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