TPF-C Technology Plan - Exoplanet Exploration Program - NASA

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Chapter 1 Back end coronagraph optics Y Z Secondary mirror surface Primary mirror surface Tertiary mirror surface X Z Figure 1-2. Raytrace diagram showing the overall optical layout of TPF-C, with side view (top) and front view (bottom). sensitivities to misalignments and polarization effects that would result from higher angles of incidence. The primary-secondary separation is 12 m, and the secondary mirror is also an offaxis mirror, elliptical in profile, but with major and minor axes of 83.0 cm and 36.5 cm, respectively. The effective focal length of the system is 146 m, providing a field-of-view of 3.6 arcsec. As shown in Figure 1-3, the light from the secondary is directed by a flat tertiary mirror to an optical bench that lies underneath the primary. The optical bench houses a wavefrontcorrection system, followed by a coronagraph. Further details of the coronagraph optics are described in the subsequent sections of this document. 6
Introduction Secondary mirror surface Primary mirror surface Back end coronagraph optics Primary mirror Tertiary mirror surface Optical bench volume 6m Primary Mirror Optical Prescription Reference 8m Primary Mirror design Figure 1-3. Optical system schematic and opto-mechanical layout. After an initial on-orbit calibration and checkout period, the instrument will begin a 5-year science mission to obtain detailed and highly accurate coronagraphic measurements in search of planets orbiting nearby stars. Scheduled for launch in 2016, this mission will make measurements with far greater accuracy than is possible from the ground and will complement subsequent measurements to be made by TPF-I. 1.6 Preliminary TPF-C Instrument Description The optics of TPF-C are currently structured around an off-axis Cassegrain telescope, followed by a wavefront compensation system, and finally an advanced coronagraph. The flow of the subcomponents of this system is shown schematically in Figure 1-4 and described in detail in the subsections that follow. Table 1-2 gives the mirror design parameters. The structure that supports the telescope and optics includes thermal isolation and actuators to reposition the secondary mirror, as well as separate thermal enclosures for the primary and secondary mirror. 7
Page 1 and 2: JPL Publication 05-8 Technology Pla
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Page 6 and 7: Recent Highlights Technical progres
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Page 42 and 43: Chapter 3 are in progress with cont
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Page 48 and 49: Chapter 3 Table 3-3. ITT Metrology
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Page 60 and 61: Chapter 3 The wavefront quality of
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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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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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