TPF-C Technology Plan - Exoplanet Exploration Program - NASA

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Chapter 7 7.4.4 Wavefront Sensing and Control Scope This effort includes the development and establishment of the flight baseline wavefront sensing and control architecture. Development and implementation of wavefront sensing and control methodologies on HCIT will continue in support of the pre-Phase A Milestone requirements, as well as Phase A and B plans for the HCIT. A flight baseline wavefront sensing and control architecture will be developed and established in Phase A. The selection will be based on trades between interferometric and multi-conjugate configurations for dual deformable mirror correction. Once a baseline is established, it will be implemented on HCIT. Control methodologies traceable to flight design will be developed, implemented and demonstrated. The simulated performance of the WFSC system will be flowed up to the TPF system requirements to determine the operational capacity of the observatory. The schedule for wavefront sensing and control work is given in Table 7-5. State of the Art TRL 3 The HCIT has demonstrated repeatable control to λ/10 4 in a laboratory environment. Table 7-5. Wavefront Sensing and Control Schedule Planned Completion Date Planned Activities Performance Targets TRL Pre-Phase A Phase A Implement wavefront sensing and control methods on HCIT Complete trade study between interferometric and multi-conjugate systems for 2-DM Wavefront sensing and control performance consistent with HCIT pre-Phase A milestone requirements Baseline WFSC architecture selected 3 3 Implement flight baseline design on the HCIT and demonstrate multi-DM control algorithms traceable to flight WFSC performance consistent with HCIT Phase A performance targets 5 Phase B Simulate the performance of the TPF-C system Verify that the observatory operational capacity meets requirements for the baselined WFSC design 5 Demonstrate WFSC baseline on combined HCIT/PDS testbed WFSC performance consistent with HCIT Phase B performance targets 6 114
Plan for Technology Development 7.4.5 Deformable Mirrors Scope The objective is to develop DMs that are reliable and robust to support the TPF-C/High Contrast Imaging Testbed with the goal of demonstrating contrast performance of 1 × 10 -10 or better at angular separations of 4 λ/D or greater from the central point source by May 2006. The scope of work for Xinetics is to demonstrate robust performance in all fundamental elements of the modular deformable mirror process for TPF/Coronagraph Science. The products to be developed are 32 × 32, 48 × 48, 64 × 64, and 96 × 96 deformable mirrors leading toward technical hardware that are reliable, large enough and robust to support flight performance levels required by September 2008. Module development and combinations will enable best understanding of last path for flight hardware development. The schedule for the deformable mirror work is given in Table 7-6. State of the Art TRL 4 Xinetics has delivered five 32 × 32 actuator DMs and two of four 64 × 64 actuator DM. The 32 × 32 DMs have been used in HCIT to achieve suppression approaching 10 -9 with speckle nulling. See Figure 3-11 in Section 3.2.1 for recent HCIT experimental results. Work is currently progressing on the 48 × 48 DM 2,304-channel single module manufacturing pathfinders; this work includes module development, actuator machining and delineation pathfinder, interconnect evolution pathfinders, and facesheet development. Table 7-6. Deformable Mirror Schedule Planned Completion Date Planned Activities Performance Targets TRL Pre-Phase A Manufacture of 64 × 64 and 48 × 48 DMs Phase A Manufacture of 96 × 96 DMs: 3 × 3 format of 32 × 32 and 2 × 2 format of 48 × 48 Contrast performance of 1 × 10 -10 or better at angular separations of 4 λ/D in the HCIT Contrast performance of 1 × 10 -10 or better at angular separations of 4 λ/D in the HCIT 4 5 115
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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 2 Error Budget Validation G
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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 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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Page 122 and 123: Chapter 7 7.4 Optics and Starlight
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Page 128 and 129: Chapter 7 7.4.6 Transmissive Optics
Page 130 and 131: Chapter 7 7.4.8 Scatterometer Scope
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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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