GeMS and GSAOI
To science instrument
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GeMS overview ! 5 sodium Laser Guide Stars on X shape, 60 arcsec on a side, with 5 16x16 Shack Hartmann WFS ! 50W laser split in 5x10W (in practice 4W on sky/LGS) ! Tip-Tilt, plate scale and rotation correction done from either: ! (up to) 3 visible NGS + one flexure GS using GSAOI On-Detector Guide Window (ODGW) ! (up to) 3 NIR GSAOI ODGW + one visible GS for slow focus ! 3 Def. Mirrors conjugated at 0, 4.5 and 9 km (currently 0 and 9 only) ! Instrument suite: ! GSAOI, imager (4kx4k NIR array = 4 HAWAII2RG) ! Flamingo2, NIR MOS & Imager ! GMOS, Visible imager & MOS ! Many subsystems: Laser, Beam Transfer Optics (BTO), Laser Launch Telescopes (LLS), ASCAM, Laser Traffic Control (LTC), Telescope laser extension, Safety systems, etc, etc, etc.
5 LGS constella9on DM0 DM9 TTM DM4.5 To science instrument NGSWFS LGSWFS Laser Launch Telescope
Magazine: GeMS and GSAOI