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The Heat Stop

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The Heat Stop

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    1. The Heat Stop 25 August 2003 ATST CoDR

    2. Heat Stop Function: first field stop, blocks most light from proceeding to M2 and subsequent optics Location: prime focus Outline here: What are we talking about? Thermal Performance I Gemini tests MuSES modeling Validation using Gemini data Hybrid Retractable Is this good enough? Seeing Performance Formulation: thermally disturbed layers Chart, in terms of average temperature of upstream skin BBSO tests to verify/sanity check Thermal Performance II Hardware modifications, hybrid Hardware modifications, retractable MuSES results w/mods Summarize Outline here: What are we talking about? Thermal Performance I Gemini tests MuSES modeling Validation using Gemini data Hybrid Retractable Is this good enough? Seeing Performance Formulation: thermally disturbed layers Chart, in terms of average temperature of upstream skin BBSO tests to verify/sanity check Thermal Performance II Hardware modifications, hybrid Hardware modifications, retractable MuSES results w/mods Summarize

    3. Requirements Block occulted field (OF) over approximately 82 arcmin circular to allow 2.5 Rs off-pointing Pass field of view (FOV)

    4. Requirements (cont.) Fast limb tracking? Mode 3: occulter must block limb light while compensating for telescope shake and seeing Remove irradiance load (up to 2.5 MW/m2)

    5. Requirements (cont.) Minimize self-induced seeing Experiments and scaling laws for small hot objects near M2 indicate insensitivity for seeing-limited observations (Beckers, Zago) Bottom line: surface temperature must be within some 10 C of ambient air temperature

    6. Concept: Tilted Flat Plate Outline here: What are we talking about? Thermal Performance I Gemini tests MuSES modeling Validation using Gemini data Hybrid Retractable Is this good enough? Seeing Performance Formulation: thermally disturbed layers Chart, in terms of average temperature of upstream skin BBSO tests to verify/sanity check Thermal Performance II Hardware modifications, hybrid Hardware modifications, retractable MuSES results w/mods Summarize Outline here: What are we talking about? Thermal Performance I Gemini tests MuSES modeling Validation using Gemini data Hybrid Retractable Is this good enough? Seeing Performance Formulation: thermally disturbed layers Chart, in terms of average temperature of upstream skin BBSO tests to verify/sanity check Thermal Performance II Hardware modifications, hybrid Hardware modifications, retractable MuSES results w/mods Summarize

    7. Concept Detail 1 Outline here: What are we talking about? Thermal Performance I Gemini tests MuSES modeling Validation using Gemini data Hybrid Retractable Is this good enough? Seeing Performance Formulation: thermally disturbed layers Chart, in terms of average temperature of upstream skin BBSO tests to verify/sanity check Thermal Performance II Hardware modifications, hybrid Hardware modifications, retractable MuSES results w/mods Summarize Outline here: What are we talking about? Thermal Performance I Gemini tests MuSES modeling Validation using Gemini data Hybrid Retractable Is this good enough? Seeing Performance Formulation: thermally disturbed layers Chart, in terms of average temperature of upstream skin BBSO tests to verify/sanity check Thermal Performance II Hardware modifications, hybrid Hardware modifications, retractable MuSES results w/mods Summarize

    8. Heat Stop Detail Outline here: What are we talking about? Thermal Performance I Gemini tests MuSES modeling Validation using Gemini data Hybrid Retractable Is this good enough? Seeing Performance Formulation: thermally disturbed layers Chart, in terms of average temperature of upstream skin BBSO tests to verify/sanity check Thermal Performance II Hardware modifications, hybrid Hardware modifications, retractable MuSES results w/mods Summarize Outline here: What are we talking about? Thermal Performance I Gemini tests MuSES modeling Validation using Gemini data Hybrid Retractable Is this good enough? Seeing Performance Formulation: thermally disturbed layers Chart, in terms of average temperature of upstream skin BBSO tests to verify/sanity check Thermal Performance II Hardware modifications, hybrid Hardware modifications, retractable MuSES results w/mods Summarize

    9. Heat Stop, Exploded Outline here: What are we talking about? Thermal Performance I Gemini tests MuSES modeling Validation using Gemini data Hybrid Retractable Is this good enough? Seeing Performance Formulation: thermally disturbed layers Chart, in terms of average temperature of upstream skin BBSO tests to verify/sanity check Thermal Performance II Hardware modifications, hybrid Hardware modifications, retractable MuSES results w/mods Summarize Outline here: What are we talking about? Thermal Performance I Gemini tests MuSES modeling Validation using Gemini data Hybrid Retractable Is this good enough? Seeing Performance Formulation: thermally disturbed layers Chart, in terms of average temperature of upstream skin BBSO tests to verify/sanity check Thermal Performance II Hardware modifications, hybrid Hardware modifications, retractable MuSES results w/mods Summarize

    10. Internal Flow Concept Outline here: What are we talking about? Thermal Performance I Gemini tests MuSES modeling Validation using Gemini data Hybrid Retractable Is this good enough? Seeing Performance Formulation: thermally disturbed layers Chart, in terms of average temperature of upstream skin BBSO tests to verify/sanity check Thermal Performance II Hardware modifications, hybrid Hardware modifications, retractable MuSES results w/mods Summarize Outline here: What are we talking about? Thermal Performance I Gemini tests MuSES modeling Validation using Gemini data Hybrid Retractable Is this good enough? Seeing Performance Formulation: thermally disturbed layers Chart, in terms of average temperature of upstream skin BBSO tests to verify/sanity check Thermal Performance II Hardware modifications, hybrid Hardware modifications, retractable MuSES results w/mods Summarize

    11. External Flow Concept Outline here: What are we talking about? Thermal Performance I Gemini tests MuSES modeling Validation using Gemini data Hybrid Retractable Is this good enough? Seeing Performance Formulation: thermally disturbed layers Chart, in terms of average temperature of upstream skin BBSO tests to verify/sanity check Thermal Performance II Hardware modifications, hybrid Hardware modifications, retractable MuSES results w/mods Summarize Outline here: What are we talking about? Thermal Performance I Gemini tests MuSES modeling Validation using Gemini data Hybrid Retractable Is this good enough? Seeing Performance Formulation: thermally disturbed layers Chart, in terms of average temperature of upstream skin BBSO tests to verify/sanity check Thermal Performance II Hardware modifications, hybrid Hardware modifications, retractable MuSES results w/mods Summarize

    12. Mounting Arrangement Outline here: What are we talking about? Thermal Performance I Gemini tests MuSES modeling Validation using Gemini data Hybrid Retractable Is this good enough? Seeing Performance Formulation: thermally disturbed layers Chart, in terms of average temperature of upstream skin BBSO tests to verify/sanity check Thermal Performance II Hardware modifications, hybrid Hardware modifications, retractable MuSES results w/mods Summarize Outline here: What are we talking about? Thermal Performance I Gemini tests MuSES modeling Validation using Gemini data Hybrid Retractable Is this good enough? Seeing Performance Formulation: thermally disturbed layers Chart, in terms of average temperature of upstream skin BBSO tests to verify/sanity check Thermal Performance II Hardware modifications, hybrid Hardware modifications, retractable MuSES results w/mods Summarize

    13. Crossflow Directors Outline here: What are we talking about? Thermal Performance I Gemini tests MuSES modeling Validation using Gemini data Hybrid Retractable Is this good enough? Seeing Performance Formulation: thermally disturbed layers Chart, in terms of average temperature of upstream skin BBSO tests to verify/sanity check Thermal Performance II Hardware modifications, hybrid Hardware modifications, retractable MuSES results w/mods Summarize Outline here: What are we talking about? Thermal Performance I Gemini tests MuSES modeling Validation using Gemini data Hybrid Retractable Is this good enough? Seeing Performance Formulation: thermally disturbed layers Chart, in terms of average temperature of upstream skin BBSO tests to verify/sanity check Thermal Performance II Hardware modifications, hybrid Hardware modifications, retractable MuSES results w/mods Summarize

    14. Plumbing and Ductwork Outline here: What are we talking about? Thermal Performance I Gemini tests MuSES modeling Validation using Gemini data Hybrid Retractable Is this good enough? Seeing Performance Formulation: thermally disturbed layers Chart, in terms of average temperature of upstream skin BBSO tests to verify/sanity check Thermal Performance II Hardware modifications, hybrid Hardware modifications, retractable MuSES results w/mods Summarize Outline here: What are we talking about? Thermal Performance I Gemini tests MuSES modeling Validation using Gemini data Hybrid Retractable Is this good enough? Seeing Performance Formulation: thermally disturbed layers Chart, in terms of average temperature of upstream skin BBSO tests to verify/sanity check Thermal Performance II Hardware modifications, hybrid Hardware modifications, retractable MuSES results w/mods Summarize

    15. Interface With OSS Outline here: What are we talking about? Thermal Performance I Gemini tests MuSES modeling Validation using Gemini data Hybrid Retractable Is this good enough? Seeing Performance Formulation: thermally disturbed layers Chart, in terms of average temperature of upstream skin BBSO tests to verify/sanity check Thermal Performance II Hardware modifications, hybrid Hardware modifications, retractable MuSES results w/mods Summarize Outline here: What are we talking about? Thermal Performance I Gemini tests MuSES modeling Validation using Gemini data Hybrid Retractable Is this good enough? Seeing Performance Formulation: thermally disturbed layers Chart, in terms of average temperature of upstream skin BBSO tests to verify/sanity check Thermal Performance II Hardware modifications, hybrid Hardware modifications, retractable MuSES results w/mods Summarize

    16. Flow Loop

    17. Safety Systems Passive-closing mirror covers Accumulators hold emergency coolant reserve Pressure-relief valves Instrumentation Surface temperature Flowrate Coolant temperature Coolant pressure

    18. Reflector Plate Thermal Performance

    19. Detail of Heat Stop Aperture

    20. Thermal Performance of Flow System

    21. Low Temperature Thermal Performance

    22. Low Temperature Pump Power

    23. Survival

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