TPF-C Technology Plan - Exoplanet Exploration Program - NASA

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Chapter 1 Pol. BS fold/steering Michelson BS DM DM compensating wedge Figure 1-6. Polarizing beamsplitter with Michelson interferometers used for wavefront correction of amplitude and phase. The arms of the interferometers terminate in deformable mirrors, shown above. Figure 1-7. Results of laboratory tests showing starlight suppression to a level better than 1 part in 10 8 . 10
Introduction be seen. Only half of the hole is dark because of the need to correct both phase and amplitude errors. In the dark hole, planets can be seen outside of the star light that has not been totally eliminated. 1.6.4 Thermal and Structural Design As shown in Figure 1-8, the back of the primary mirror is surrounded by a heated thermal enclosure that maintains a steady controlled temperature gradient through the primary mirror, the coronagraph, and the science instruments. The temperature will be close to room temperature to allow the primary mirror to operate at the same temperature that it was fabricated. There is a similar smaller enclosure around the secondary mirror that also keeps its temperature steady at room temperature. Behind the secondary mirror is an actuated hexapod with dual stage actuators that provide both coarse and fine position adjustment. The support of the actuated hexapod is thermally isolated from the secondary tower. The secondary mirror and primary mirror will have a 6-beam laser metrology system that will permit positional monitoring of the secondary mirror relative to the primary mirror at all times. The secondary tower itself will not be thermally controlled. The tower is attached to an aft metering structure through three thermally-isolated bipods. The aft metering structure supports the telescope components: the primary mirror and the secondary tower. The aft metering structure is also attached to a payload support structure that integrates the telescope to the instruments. Secondary mirror thermal enclosure Coronagraph sensor system Actuated hexapod Secondary mirror Secondary mirror assembly and tower Primary mirror (shown transparent orange) 12m Deployed secondary tower Primary Mirror (8m x 3.5m) Launch support interface (4 pl) Secondary tower bracket Primary mirror support bipod (3 pl) Telescope Support Structure (TSS) Primary Mirror thermal enclosure Note: Primary mirror not shown Primary Mirror Aft Metering Structure (AMS) Coronagraph sensor system envelope Figure 1-8. Exploded view showing the thermal and structural design of supports for the <strong>TPF</strong>-C primary and secondary mirrors. 11
Page 1 and 2: JPL Publication 05-8 Technology Pla
Page 3: TECHNOLOGY PLAN TERRESTRIAL PLANET
Page 6 and 7: Recent Highlights Technical progres
Page 8 and 9: Figure i-4. Deformable mirror deliv
Page 10 and 11: Table of Contents Approvals........
Page 12 and 13: 7.5.2 Precision Hexapod............
Page 14 and 15: Chapter 1 Figure 1-1. Artist's impr
Page 16 and 17: Chapter 1 interferometry, continues
Page 18 and 19: Chapter 1 Back end coronagraph opti
Page 20 and 21: Chapter 1 Surrounding the whole tel
Page 24 and 25: Chapter 1 1.6.5 Sunshield The teles
Page 26 and 27: Chapter 1 expected architecture dow
Page 28 and 29: Chapter 1 Table 1-3. TPF-C Technolo
Page 30 and 31: Chapter 1 3B: Demonstrate, using th
Page 32 and 33: Chapter 2 2 Error Budgets 2.1 Contr
Page 34 and 35: Chapter 2 Error Budget Validation G
Page 36 and 37: Chapter 2 Further, it is shown that
Page 38 and 39: Chapter 2 Table 2-1. Requirement on
Page 40 and 41: Chapter 3 3 Optics and Starlight Su
Page 42 and 43: Chapter 3 are in progress with cont
Page 44 and 45: Chapter 3 Figure 3-5. Coronagraph s
Page 46 and 47: Chapter 3 (though not light-weight
Page 48 and 49: Chapter 3 Table 3-3. ITT Metrology
Page 50 and 51: Chapter 3 observations. The time it
Page 52 and 53: Chapter 3 vacuum-compatible, low-po
Page 54 and 55: Chapter 3 blank size. Westerhoff et
Page 56 and 57: Chapter 3 configurations, performan
Page 58 and 59: Chapter 3 Figure 3-10: Plots showin
Page 60 and 61: Chapter 3 The wavefront quality of
Page 62 and 63: Chapter 3 Figure 3-13. Optical layo
Page 64 and 65: Chapter 3 algorithms have limitatio
Page 66 and 67: Chapter 3 simulated star source is
Page 68 and 69: Chapter 4 Figure 4-1. Overview of t
Page 70 and 71: 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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Chapter 4 giving confidence that fl
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Chapter 4 surface polish is nonethe
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Chapter 5 TPF-C is planning a suite
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Chapter 5 engineering judgment (i.e
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Chapter 5 categories, in reality ea
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Chapter 5 Table 5-3. Validation of
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Chapter 5 5.6.1 Modeling Methodolog
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Chapter 5 strength of computer simu
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Chapter 6 6 Instrument Technology a
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Chapter 6 Figure 6-1. Detailed conc
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Chapter 6 The first method is self-
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Chapter 6 super computers and is us
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Chapter 7 7 Plan for Technology Dev
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Chapter 7 Figure 7-1. TPF-C Technol
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Chapter 7 Improvements to the DM ov
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Chapter 7 7.3 Error Budgets 7.3.1 D
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Chapter 7 7.4 Optics and Starlight
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Chapter 7 7.4.2 Apodizing Masks and
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Chapter 7 7.4.4 Wavefront Sensing a
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Chapter 7 7.4.6 Transmissive Optics
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Chapter 7 7.4.8 Scatterometer Scope
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Chapter 7 7.5 Structural, Thermal,
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Chapter 7 7.5.3 Precision Structura
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Chapter 7 model of TPF-C and should
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Chapter 7 7.5.6 Secondary Mirror To
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Chapter 7 7.5.8 Sub-scale EM Sunshi
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Chapter 7 7.6 Integrated Modeling a
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Chapter 7 7.7.3 Advanced Concepts:
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Chapter 8 134
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Appendices Appendix B: TPF-C Detail
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Appendices Appendix D: TPF-C Techno
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Appendices Appendix F: Acronym List
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Appendices RWA SAO SBIR SIM SM SMFA
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TPF-C Technology Plan - Exoplanet Exploration Program - NASA

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