SDW 2005, TaorminaReiss et al., We Must be MAD1 We Must be MAD Pushing FIERA to its Limits Roland Reiss, Andrea Balestra, Claudio Cumani, Christoph Geimer,

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.