SDW 2005, Taormina Reiss et al., We Must be MAD 1

We Must be MADPushing FIERA to its Limits

Roland Reiss, Andrea Balestra, Claudio Cumani, Christoph Geimer, Javier Reyes,

Enrico Marchetti, Joana Santos

European Southern Observatory (http://www.eso.org)Karl-Schwarzschild-Str. 2 D-85748 Garching by Munich, Germany

SDW 2005, Taormina Reiss et al., We Must be MAD 2

We Must be MAD

Pushing FIERA to its Limits

• MAD (Multi conjugate Adaptive optics Demonstrator) employs 5 CCDs in total

• 3 CCDs for Shack-Hartmann Wavefront Sensing (SHWFS)

• 2 CCDs for Layer-Oriented Wavefront Sensing (LOWFS)

SDW 2005, Taormina Reiss et al., We Must be MAD 3

SHWFS vs. LOWFS Mode

• SHWFS: – 3 CCDs– same frame rate– same binning factor– 12 video channels (625 kpix/sec each)– window 64x64 per CCD

• LOWFS: – 2 CCDs, – frame rate ratios of 2:1 and 4:1 – binning factors (2x2 and 4x4)– 8 video channels (625 kpix/sec each)– Window 80x80 per CCD

SDW 2005, Taormina Reiss et al., We Must be MAD 4

Mechanical Constraints

• Limited head size (96 x 68 x 30 mm3)

• High flexibility of electrical connections required

• Peltier cooled CCD39-01bi from e2v

SDW 2005, Taormina Reiss et al., We Must be MAD 5

Performance (SHWFS)

• Frame rate 400 Hz (64 x192 pixels).• Average pixel rate 4.9 Mpixel/sec.• Burst pixel rate 7.5 Mpixel/sec.• Noise @ 400Hz approx. 6 e-RMS.