TPF-C Technology Plan - Exoplanet Exploration Program - NASA

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Chapter 7 7.6 Integrated Modeling and Model Validation 7.6.1 Integrated Modeling Tools Scope Code architecture, optical aberration calculations, large problem numerics (parallel processing) and design sensitivity and optimization components are currently supported by JPL R&TD development funding for use in future missions such as TPF-C; TPF specific components include element development and nonlinear heat transfer methods development. Within these TPFfunded areas, technology completion will include: • Completion and validation of nonlinear transient solution procedures: Gray-body diffuse exchange by the end of pre-Phase A, specular exchange with thermal control by Phase A. Validation will consist of performance benchmarking against commercial tools currently used by design teams, and test validation using JPL in-house test programs. • Thermal and structural finite elements: Completion of initial library by end of pre-Phase A, validation using theoretical, commercial, and test fixture results. • Optical aberration calculation: Automated optical aberration calculations for the purpose of interfacing with codes such as SPICA, MACOS, Code-V, etc. are seen as fundamental to the success of the analytic methods development task, and should be available by the end of pre-Phase A. Validation will consist of demonstrated higher levels of precision that with existing tools, in support of contrast ratios on order of 10 -9 . The integrated modeling tools have achieved TRL 3. Their schedule is given in Table 7-20. Table 7-20. Integrated Modeling Tools Schedule Planned Completio n Date Planned Activities Performance Targets TRL Pre-Phase A Phase A Phase B Completion of nonlinear transient heat transfer solutions, completion of initial thermal/structural finite element library. Nonlinear transient specular exchange, thermal control module. Nonlinear structural analysis capabilities for local mechanical, material nonlinearity investigation. Demonstrate ability to compute thermal, structural responses to degree of accuracy required by TPF, correlate performance with commercially-available tools, validate performance against HCIT. Utilization of code by TPF design team members for integrated thermal, structural and optical aberration calculations, testbed validation, system error budget investigation. Continued use by design teams to increasing level of sophistication including incorporation of nonlinear optical element, hinge, latch behaviour. 130
Plan for Technology Development 7.7 Instrument Technology and Advanced Concepts 7.7.1 Instrument Technology The classes of instruments defined in the Instrument Concept Studies and included in the Science and Technology Definition Team final report are likely to require technology development. Once identified, the high-priority developments will be addressed in the next update to the TPF- C Technology Development Plan. This section serves as a placeholder for those activities. 7.7.2 Advanced Concepts: Visible Nuller Testbed Scope The visible nuller testbed must integrate existing component technologies and demonstrate the concept of starlight suppression on a system basis in white light, and at the 10 -10 contrast required for detection and spectroscopy of extra-solar planets. The 2-mirror rooftop design will be replaced by 3 mirrors to facilitate reimaging the deformable mirror onto the single-mode fiber array. When the deformable mirror and fiber array are in place, this testbed will demonstrate the ability of a coherent single-mode fiber array to spatial-filter over a full aperture, showing enhanced nulling over a full field of view. The visible nuller testbed schedule is given in Table 7-21. State of the Art TRL 3 The visible nuller has achieved nulls of 5 × 10 -6 in polarized laser light and 10 -4 in unpolarized white light with a 10% bandpass in a single optical channel. A single-mode fiber array having 51 rows has been successfully implemented to form a 496-fiber array. Table 7-21. Visible Nuller Testbed Schedule Planned Completion Date Planned Activities Performance Targets TRL Pre-Phase A Q4 FY05 Establish Visible Nuller Testbed configuration. Convert to 3 mirror arm nuller. Demonstration of nulling interferometer component for instrument. Single pixel contrast ≤ 10 -6 in white light (λ=650 nm, 5-10 % bandpass) 3 Q2 FY06 Demonstrate deep nulling required for Earthlike planet detection and spectroscopy Single pixel contrast ≤ 10 -7 in white light (λ=650 nm, 5-10 % bandpass) 3 Q3 FY06 First demonstration of multiple channel nulling. Integration of component technologies, nuller, DM, SMFA for system demonstration capability in a vacuum environment. Predict contrast performance. Multiple pixel contrast less than single pixel contrast over 100 pixels or more. Contrast performance prediction at the 10 -10 level. 3 131
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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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7.5.2 Precision Hexapod............
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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 3 simulated star source is
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Chapter 4 4.2 Subsystem and System
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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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