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Status report of AO188+LGS (+future AO)

Yutaka Hayano (Subaru Telescope, NAOJ) S. Oya, M. Hattori, Y. Saito, Y. Minowa, M. Ito, H. Terada, T.S. Pyo, H. Takami, M. Iye (NAOJ), S. Egner (Kayser-Threde GmbH), S Oyabu (Nagoya U.). Status report of AO188+LGS (+future AO). Topics in 2010. Recovery of damaged deformable mirror.

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Status report of AO188+LGS (+future AO)

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  1. Yutaka Hayano (Subaru Telescope, NAOJ) S. Oya, M. Hattori, Y. Saito, Y. Minowa, M. Ito, H. Terada, T.S. Pyo, H. Takami, M. Iye (NAOJ), S. Egner (Kayser-Threde GmbH), S Oyabu (Nagoya U.) Status report of AO188+LGS(+future AO)

  2. Topics in 2010. • Recovery of damaged deformable mirror. • LGS mode commissioning. • Risk-shared open use at S11A and S11B.

  3. New deformable mirror (DM) • DM was damaged in Jan, 2010. • High AC current was applied to the two ground pins. • New DM has delivered in August, 2010 • Implemented electrical circuit breaker. • Implemented software limit switch. • On-sky performance test in October, 2010. • Back to open use operation in November, 2010. • Web release on Dec. 27, 2010.

  4. Performance of NGS mode.

  5. Commissioning of LGS mode. • First closed loop on sky in December, 2010. • Strehl ratio ~ 0.1 – 0.2 @ K-band • FWHM ~ 0.1 arcsec @ K-band • Performance v.s. guide star magnitude. • 17.8 mag equiv @ 1 kcps / APD (Low-order WFS.) • Performance v.s. separatation of TT guide star. • Anisoplanatism of TT/focus mode might be larger than 60”.

  6. Risk shared open use • Risk in performance. • SR ~ 0.1 – 0.2, FWHM ~ 0.1” at K-band. • Guide star magnitude: brighter than 17.5 in R-band. • Separation of guide star: < 80”. • Elevation limit = 25 deg. • Other features. • ADC • Science path, high-order WFS, low-order WFS. • F-conversion optics. (12 mas mode.)

  7. Future AO for Subaru Telescope. • 3rd generation AO for next instrument at IR. • Wider field coverage. (~ 10 arcmin.) • High throughput. (Adaptive secondary mirror.) • Active/Adaptive optics. • Multiple guide stars and multiple WFSs. • MOAO, GLAO, LTAO etc.

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