TPF-C Technology Plan - Exoplanet Exploration Program - NASA

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Chapter 7 7.4 Optics and Starlight Suppression Testbeds 7.4.1 Phase A and B Plans for HCIT and PDS Scope All the pre-Phase A milestones will probably be met using the half-dark hole configuration. Full-dark hole performance requires two deformable mirrors to control both phase and amplitude. Trade studies to determine the optimum architecture (Michelson configuration or two DMs in series) and necessary control algorithms are underway as part of the Wavefront Sensing and Control task. Design and fabrication of opto-mechanical hardware is planned for FY06, with installation in the HCIT and experimentation commencing at the beginning of Phase A. Completion of this activity had been planned for pre-Phase A, but it resulted in an unreasonable schedule that put required milestone performance at risk. If modeling shows that two DMs are needed to get the broadband performance required in Milestone 2, the HCIT schedule and resources will be adjusted. Also in Phase A, a custom bench and mounts will be designed and fabricated for the HCIT, with completion at the end of Phase A. This will provide the thermal stability needed to achieve and maintain 1 × 10 -10 contrast, as well as enabling full structural and thermal modeling of the testbed. Initial study work for the Planet Detection Simulator will commence near the end of pre-Phase A, with detailed design and fabrication of the hardware during Phase A and installation in the HCIT occurring at the beginning of Phase B, after the custom testbed bench has been integrated. During Phases A and B, the spectral bandwidth will be increased and the center wavelength shifted to lower wavelengths, with the performance target for Phase B matching the required TPF-C planet detection bandpass (currently 500-600 nm). The HCIT and PDS milestone schedule is given in Table 7-2. State of the Art TRL 4 Laboratory results from the HCIT have shown an average contrast of 0.9 × 10 -9 for laser light as measured in the half-dark hole over angles from 4 to 10 λ/D. 110
Plan for Technology Development Table 7-2. HCIT and PDS Milestone Schedule Planned Completion Date Planned Activities Performance Targets TRL Pre-Phase A (Q3 FY05) Pre-Phase A (Q3 FY06) Pre-Phase A (Q4 FY06) Pre-Phase A (Q1 FY07) Phase A Phase B Monochromatic starlight suppression Broadband starlight suppression Modeling of testbed Integrated modeling of mission Demonstrate full-dark hole using 2 DMs; design/build custom bench and mounts. Experiments with custom bench; install and operate Planet Detection Simulator Milestone 1: 10 -9 contrast, 4 λ/D, laser light (λ=785 nm) Milestone 2: 10 -9 contrast, 4 λ/D, 60 nm bandwidth centered at 800 nm Milestone 3A: Correlation of experimental testbed data and optical models of the testbed at 10 -9 level Milestone 3B: Demonstrate viability of 10 -10 contrast in flight mission using modeling approach validated against testbed and current mission error budget 1 × 10 -9 contrast, full dark hole, 4 λ/D, 100 nm bandwidth centered at 675 nm; correlation of experimental testbed data with optical models of the testbed at 1 × 10 -9 level 1 × 10 -10 contrast, full-dark hole, 4 λ/D, 100 nm 6 bandwidth centered at 550 nm (or current requirement for planet detection); correlation of experimental testbed data with integrated models of the testbed at 1 × 10 -10 4 4 4 4 5 111
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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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Page 76 and 77: Chapter 4 Figure 4-7. Calibration o
Page 78 and 79: Chapter 4 Figure 4-8. Comparison of
Page 80 and 81: Chapter 4 4.2 Subsystem and System
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Page 84 and 85: Chapter 4 Figure 4-12. Fine guiding
Page 86 and 87: Chapter 4 (5) The Fine Steering Mir
Page 88 and 89: Chapter 4 Third, precise thermal co
Page 90 and 91: Chapter 4 giving confidence that fl
Page 92 and 93: Chapter 4 surface polish is nonethe
Page 94 and 95: Chapter 5 TPF-C is planning a suite
Page 96 and 97: Chapter 5 engineering judgment (i.e
Page 98 and 99: Chapter 5 categories, in reality ea
Page 100 and 101: Chapter 5 Table 5-3. Validation of
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Page 106 and 107: Chapter 6 6 Instrument Technology a
Page 108 and 109: Chapter 6 Figure 6-1. Detailed conc
Page 110 and 111: Chapter 6 The first method is self-
Page 112 and 113: Chapter 6 super computers and is us
Page 114 and 115: Chapter 7 7 Plan for Technology Dev
Page 116 and 117: Chapter 7 Figure 7-1. TPF-C Technol
Page 118 and 119: Chapter 7 Improvements to the DM ov
Page 120 and 121: Chapter 7 7.3 Error Budgets 7.3.1 D
Page 124 and 125: Chapter 7 7.4.2 Apodizing Masks and
Page 126 and 127: Chapter 7 7.4.4 Wavefront Sensing a
Page 128 and 129: Chapter 7 7.4.6 Transmissive Optics
Page 130 and 131: Chapter 7 7.4.8 Scatterometer Scope
Page 132 and 133: Chapter 7 7.5 Structural, Thermal,
Page 134 and 135: Chapter 7 7.5.3 Precision Structura
Page 136 and 137: Chapter 7 model of TPF-C and should
Page 138 and 139: Chapter 7 7.5.6 Secondary Mirror To
Page 140 and 141: Chapter 7 7.5.8 Sub-scale EM Sunshi
Page 142 and 143: Chapter 7 7.6 Integrated Modeling a
Page 144 and 145: Chapter 7 7.7.3 Advanced Concepts:
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Page 148 and 149: Appendices Appendix B: TPF-C Detail
Page 150 and 151: Appendices Appendix D: TPF-C Techno
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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