TPF-C Technology Plan - Exoplanet Exploration Program - NASA

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Chapter 7 7.5.6 Secondary Mirror Tower Partial Structure Testbed Scope The current plan is to have this testbed competed, designed and built through Phase A, with model validation and other technology objectives completed in the early-to-mid-Phase B time frame. The secondary mirror tower partial structure testbed has achieved TRL 3. The testbed schedule is given in Table 7-16. Table 7-16. Secondary Mirror Tower Partial Structure Testbed Schedule Planned Completion Date Planned Activities Performance Targets TRL Phase A Design and build testbed Test materials and subcomponents individually prior to testbed integration Design testbed, hinge/latch and metrology system consistent with 25 nm SM stability requirement above 1 Hz 3, 4 Validate sub-component models Phase B Perform tests and validate testbed models Validate microdynamic bounding analyses on flight-like hardware for 25 nm SM stability requirement above 1 Hz 5, 6 126
Plan for Technology Development 7.5.7 Pointing Control Testbed Scope The goals of the Pointing Control Testbed are to demonstrate both the capability to deliver very high precision pointing and to reject disturbances at the coronagraph using fine guidance sensor (FGS) measurements coupled with a fine steering mirror (FSM) pointing control. Additional capabilities required are rigid body pointing of the entire payload using reaction wheels, lowbandwidth steering of the secondary mirror, and perhaps pointing offset of the payload using active isolation actuators. In pre-Phase A, we will focus on analysis and data collection of the various sensor components. In Phase A, we will develop key pieces of the testbed, and perform open-loop tests of the FSM and FGS. In Phase B, the method for verifying the measured performance versus the modeled performance (a “scoring system”) will be developed; the requirements for isolation levels will be defined; and closed-loop performance of the FGS/FSM/optical path, acquisition sensor, and disturbance rejection will be tested. The pointing control testbed has achieved TRL 3. The testbed schedule is given in Table 7-17. Table 7-17. Pointing Control Testbed Schedule Planned Completion Date Planned Activities Performance Targets TRL Phase A Implement FGS camera Implement FSM control loop Develop disturbance generators Demonstrate open-loop pointing control accuracy, resolution and 50 Hz bandwidth on FSM Demonstrate measurement accuracy of 1 mas on FGS sensor at 500 Hz; meet tighter requirements in Phase B Develop capability to induce modeled vibration into testbed, required in Phase B 5 Phase B Develop validation “scoreboard” Design and build isolated testbed Test FSM/FGS/optical path subsystem element. Test acquisition camera accuracy Test integrated system with disturbance input. Demonstrate capability for validating high-precision pointing Demonstrate isolation required for integrated testing Demonstrate pointing accuracy to 0.3 mas jitter, 0.3 offset at subassembly level with controlled disturbances, in vacuum chamber Show 10 mas accuracy/axis for stars brighter than roughly 10,000 electrons signal Demonstrate ability to reject disturbances to testbed using FSM/FGS/optical path simulation to full performance (currently ~0.3mas 1 sigma jitter) 5,6 127
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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 1.6.5 Sunshield The teles
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Chapter 1 expected architecture dow
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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 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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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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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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