Workshop Scientific Detectors for Astronomy June 16-22, 2002 Waimea, Hawai`i

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 : <3.5e-, 500Hz• Texp_CCD1 = N* Texp_CCD2 and synchronized

Poster #10

Workshop Scientific Detectors for Astronomy June 16-22, 2002 Waimea, Hawai`i

CCD wavefront sensing system for the ESO Multi-conjugate Adaptive Optics Demonstrator (MAD)

2’ field of view

Micro lens array

XY stageSoft CCD cables

Head

Pickup mirror

200 mm

ESO FIERA system

AO Marconi CCD504 ports/CCD used

24 m pixels

Opto-mechanical setupShack Hartmann WFS