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CCD wavefront sensing system for the ESO
Multi-conjugate Adaptive Optics Demonstrator
(MAD) C.Cavadore, C.Cumani, The ESO-ODT team,
F.Franza, E.Marchetti, The ESO AO group European
Southern Observatory

• MCAO prototype toward ELT (3-8 stars, high Strehl
  over 2 in K)
• Visible Wavefront sensors 5 CCD Marconi 50
• 2 AO correction methods ? 3 2 CCD complete
  heads
• ESO FIERA controller ? 12 video inputs
• CCD Head must be compact
• 90x60x40 mm, light 500g, TEC cooling, vacuum,
  Embedded micro lens array ? New head designs
• Mounted on XY stages
• Find the star to sense the wavefront
• Cable length and stiffness requirements soft
  cables
• Low noise and high frame rate lt3.5e-, 500Hz
• Texp_CCD1 N Texp_CCD2 and synchronized

Poster 10
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CCD wavefront sensing system for the ESO
Multi-conjugate Adaptive Optics Demonstrator
(MAD)
Micro lens array
2 field of view
Pickup mirror
ESO FIERA system
XY stage
Soft CCD cables
200 mm
Head
Opto-mechanical setup Shack Hartmann WFS
AO Marconi CCD50 4 ports/CCD used 24 mm pixels