Method for Deriving Telescope Specifications for Earth-Detecting Coronagraphs and Its Use in Prioritizing Technology Development Investments

Nemati, Bijan ; Stahl, H Philip

关键词: TELESCOPES;    CORONAGRAPHS;    DETECTION;    EXTRASOLAR PLANETS;    SEGMENTED MIRRORS;    STABILITY;    WAVE FRONTS;    INSTRUMENT ERRORS;    THERMAL EXPANSION;    TEMPERATURE CONTROL;    ACTIVE CONTROL;    NOISE REDUCTION;    HOMOGENEITY;    VIBRATION ISOLATORS;    PERFORMANCE PREDICTION;    JAMES WEBB SPACE TELESCOPE;    MISSION PLANNING;   

RP-ID  :  MSFC-E-DAA-TN70875

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来源: NASA Technical Reports Server

【 摘 要 】

Different potential exoplanet mission concepts require different enabling and enhancing technologies. Decisions regarding prioritizing the development of these technologies can be made using a Science-Driven Systems-Engineering framework. The white paper makes the following specific recommendations. (1) Any potential telescope/coronagraph combination should develop a wavefront stability error budget using the method described in this white paper. That error budget will inform discussions about what technology development will be needed to enable the mission. (2) Enhancing and enabling technologies requiring investment include: low noise reaction wheels or control moment gyros; micro-thruster technology; active vibration isolation; materials and design practice for making lightweight stiff structures and optical components; 200-hertz wavefront sensing and control; 500-hertz sub-picometer-precision edge sensor and position actuators; non-destructive process to quantify CTE (Coefficient of Thermal Expansion) homogeneity of 4-meter class mirrors to an uncertainty of plus or minus 1 parts per billion per degree Kelvin over a 100 by 100 sampling; laser gauge positional metrology system; and predictive active thermal control.