TPF-C Technology Plan - Exoplanet Exploration Program - NASA

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Chapter 7 7.5.8 Sub-scale EM Sunshield and Isothermal Enclosure Scope The testbed development begins during pre-Phase A, roughly at the beginning of FY06, and concludes at the end of Phase A. Testbed design will be strongly affected by the need to minimize thermal noise arising from the simulated space environment. Measurements will evaluate the design of the sunshield, the thermal enclosures and the temperature control systems. It is understood that there is a significant risk that the design verified by the testbed during Phase A will change significantly by the time that the final flight design is set at the critical design review. Early demonstration of thermal design feasibility in Phase A is judged a worthwhile investment. Significant flight design changes may be incorporated and verified in a updated testbed, if necessary, later in the program. The sub-scale EM sunshield and isothermal enclosure have achieved TRL 3. Their schedule is given in Table 7-18. Table 7-18. Sub-scale EM Sunshield and Isothermal Enclosure Schedule Planned Completion Date Planned Activities Performance Targets TRL Pre-Phase A Q4 FY05 Select baseline sunshield configuration Characterize specularity of sunshield layers based on scattering measurements of previously folded material Select candidate isothermal cavity components Survey available 10-100 micro-K thermometry components (sensors and PID controllers) for room temperature control. Consider the need for component space qualification 4-5 (comp) Q2 FY06 Design the sunshield Complete thermal model of sunshield assembly including IR BRDF, micrometeoroid effects, rip-stop features, deployment system effects, etc. 2-3 (sys) Design the isothermal cavity Requirements summary for the Isothermal Cavity testbed completed and approved Preliminary design including the dummy mirror and the supporting AMS/PSS structure completed Plan for preliminary qualification testing is established on EMs sensors/controllers by early in Phase A if need is identified 2-3 (sys) Phase A Complete design, construction and checkout of the Sun/Iso testbed with an installed dummy mirror system. Complete thermal performance testing of above testbed. By mid-Phase A, select a site for the testbed, update the testbed requirements, complete a final design, and have it reviewed and approved. Procure the components and assemble the testbed late in Phase A. Perform any critical component qualification testing per plan from pre-Phase A In the presence of external thermal disturbances simulating the effects of dithers and slews, demonstrate mirror temperature control at the required flight levels. Correlate analytical models to the test data to validate models that can later be scaled to predict the PM thermal response of the full-scale TPF-C to dithers and slews. 5-6 (comp) 5-6 (sys) 128
Plan for Technology Development 7.5.9 Sub-scale EM Primary Mirror Assembly Scope This testbed is essentially the same testbed as described in the preceding section but with added features. In the initial build-up of the testbed, vibration isolation will be included for convenience and efficiency, but is not required for the thermal control system evaluation. The interferometer and its attendant controls can be added after the tests on the sunshield/thermal enclosure systems have been completed. Optical testing of the thermal control system will occur during Phase B. The sub-scale EM primary mirror assembly has achieved TRL 3. The assembly schedule is given in Table 7-19. Table 7-19. Sub-scale EM Primary Mirror Assembly Schedule Planned Completion Date Planned Activities Performance Targets TRL Phase B Convert the Sunshield/Isothermal Cavity testbed into the Subscale PM Assembly testbed, and test the sub-scale PM in the new testbed. Design and procure the high-quality sub-scale mirror needed for the optical testing of the Sunshield/Isothermal Cavity testbed. This will likely need to be started sometime late in Phase A. In the presence of external thermal disturbances simulating the effects of dithers and slews, demonstrate optical shape control at the required flight levels. 5-6 (sys) Correlate analytical models to the test data to validate models that can later be scaled to predict the optical response of the full-scale TPF-C to dithers and slews. 129
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JPL Publication 05-8 Technology Pla
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TECHNOLOGY PLAN TERRESTRIAL PLANET
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Recent Highlights Technical progres
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Figure i-4. Deformable mirror deliv
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Table of Contents Approvals........
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7.5.2 Precision Hexapod............
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Chapter 1 Figure 1-1. Artist's impr
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Chapter 1 interferometry, continues
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Chapter 1 Back end coronagraph opti
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Chapter 1 Surrounding the whole tel
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Chapter 1 Pol. BS fold/steering Mic
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Chapter 1 1.6.5 Sunshield The teles
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Chapter 1 expected architecture dow
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Chapter 1 Table 1-3. TPF-C Technolo
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Chapter 1 3B: Demonstrate, using th
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Chapter 2 2 Error Budgets 2.1 Contr
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Chapter 2 Error Budget Validation G
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Chapter 2 Further, it is shown that
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Chapter 2 Table 2-1. Requirement on
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Chapter 3 3 Optics and Starlight Su
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Chapter 3 are in progress with cont
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Chapter 3 Figure 3-5. Coronagraph s
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Chapter 3 (though not light-weight
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Chapter 3 Table 3-3. ITT Metrology
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Chapter 3 observations. The time it
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Chapter 3 vacuum-compatible, low-po
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Chapter 3 blank size. Westerhoff et
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Chapter 3 configurations, performan
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Chapter 3 Figure 3-10: Plots showin
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Chapter 3 The wavefront quality of
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Chapter 3 Figure 3-13. Optical layo
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Chapter 3 algorithms have limitatio
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Chapter 3 simulated star source is
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Chapter 4 Figure 4-1. Overview of t
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Chapter 4 enclosures, and stable la
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Chapter 4 facilities from which dat
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Chapter 4 Figure 4-5. Microslip Tri
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Chapter 4 Figure 4-7. Calibration o
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Chapter 4 Figure 4-8. Comparison of
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Chapter 4 4.2 Subsystem and System
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Chapter 4 Figure 4-11. Schematic of
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Chapter 4 Figure 4-12. Fine guiding
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Chapter 4 (5) The Fine Steering Mir
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Chapter 4 Third, precise thermal co
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Page 148 and 149: Appendices Appendix B: TPF-C Detail
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Page 152 and 153: Appendices Appendix F: Acronym List
Page 154: Appendices RWA SAO SBIR SIM SM SMFA
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TPF-C Technology Plan - Exoplanet Exploration Program - NASA

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