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Adaptive Optics Systems Engineering on GMT

Adaptive Optics Systems Engineering on GMT. Peter McGregor. Will GMT queue schedule instruments? What instrument configuration time is acceptable? Will GMT have general-purpose ports ? What field of view? Will the upper IP support non-AO instruments ? What field of view?

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Adaptive Optics Systems Engineering on GMT

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  1. Adaptive Optics Systems Engineering on GMT Peter McGregor PSWG March 2008

  2. Will GMT queue schedule instruments? What instrument configuration time is acceptable? Will GMT have general-purpose ports? What field of view? Will the upper IP support non-AO instruments? What field of view? What acquisition/calibration support? Will M1/M2 be phased “intrinsically”? If extrinsic, what FoV/magnitude star is required? What are the advantages of using an ASM? What is optimal AO instrument performance? How can maximum AO sky coverage be achieved? What TTWFS patrol field? Yes 5 min Yes 5 arcmin Yes 5 arcmin Full Yes ? TBD TBD TBD TBD Top-Level Questions: PSWG March 2008

  3. Proposed Solution: • 5 arcmin folded Gregorian focus on upper IP • +/- 75 arcsec AO engineering field • +/- 30 arcsec AO science field • Integrated acquisition and calibration facilities • Multiple (4-6) non-AO & AO instrument ports • Rapid reconfiguration between instruments • Maximum cryogenic AO system and instruments • Maximum AO tip-tilt WFS patrol field • Minimum interference in science path PSWG March 2008

  4. Active Opt. WFS PWFS New ASM AO Paradigm T-T-F WFS LGS WFS Instrument Phasing Cam Truth WFS NGS WFS AcqCam PSWG March 2008

  5. Outstanding Issues: • Does M1 phasing require a 10 arcmin patrol field? • Does this invalidate the concept? • Or does it demand an intrinsic telescope solution? • How should field/pupil rotation be compensated? • Large diameter ferro-fluidic hermetic seals? • Implications for servicability? • How to calibrate LGS AO system with ASM? • Are non-common path phase errors acceptable? • Where to locate the IR instrument cold stop? • Should GMACS/NIRMOS have exclusive access? • Do they restrict on AO designs? PSWG March 2008

  6. Non-AO Support Requirements • Multiple (6?) instrument ports • 5 arcmin diameter FOV • 2 Peripheral Wave Front Sensors • Maintain independent tip-tilt-focus of 7 M1 segments • Active optics monitoring • Instrument rotator monitoring • Acquisition camera • Instrument (& WFS) calibration unit PSWG March 2008

  7. Wave Front Sensor Drum PSWG March 2008

  8. Acquisition Camera PSWG March 2008

  9. AO WFS Requirements • > 3 NGS tip-tilt/focus near-infrared WFS (> 60” rad.) • 6 LGS high-order WFS (35” radius) • 1 high-order optical NGS WFS (on-axis) • 1 high-order optical(?) truth WFS • M1 segment phasing WFS PSWG March 2008

  10. Full AO WFS System NGS WFS Phasing Camera LGS WFS PSWG March 2008

  11. GLAO LGS WFS PSWG March 2008

  12. Complete Instr. Support Unit NGS WFS Phasing Camera LGS WFS Calibration Unit 3.5 m PSWG March 2008

  13. Complete Instr. Support Unit PSWG March 2008

  14. At Second Focus… • Tip-tilt-focus wave front sensors for LTAO • Truth wave front sensor • Minimize non-common path errors • Science instrument… • All with field derotation PSWG March 2008

  15. Full AO System + GMTIFS PSWG March 2008

  16. Summary • Demonstrated a feasible implementation of AO at the f/8 Gregorian focus • Optics are large and complex • Consequences of moving to an f/16 feed should be considered • More work is required to: • Improve optical performance • Develop concepts for science instruments (GMTIFS, MOAO, MCAO) • Include WFSs at second focus • Address field derotation on a stationary Instrument Platform • Consider 10 arcmin(?) diameter phasing camera patrol field PSWG March 2008

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