Plato Consortium Kickoff Meeting, Paris 1 09-Nov-2010 Plato CCD and Front-End Electronics Dave Walton UCL/MSSL

Plato Consortium Kickoff Meeting, Paris 2 09-Nov-2010 Overview Two types of CCD/FEE Normal 32 telescopes Full-frame, no shutter Cadence = 25 s (22 s integration, 3 s readout) 2 ports per CCD, 4 Mpix/s/port Fast 2 telescopes Frame-transfer Cadence = 2.5 s (frame transfer 0.4 s) 2 ports per CCD, 4 Mpix/s/port

Plato Consortium Kickoff Meeting, Paris 3 09-Nov-2010 Focal plane coverage

Plato Consortium Kickoff Meeting, Paris 4 09-Nov-2010 CCD progress – package and connections Flexi length 120 mm. Trade-off between thermal isolation and bandwidth/interference

Plato Consortium Kickoff Meeting, Paris 5 09-Nov-2010 CCD Parameters 4510 x 4510 pixels per CCD 18 µm pixel 81.2 x 81.2 mm 2 per CCD Full well >= 900 ke- Thinned, back-illuminated 3-side buttable Variant: Frame-transfer for fast cameras Total CCDs to fly = 136. Area = 0.9 m 2 Largest CCD area ever flown (?) Gaia CCD at MSSL Plato CCD is x2.4 larger In area

Plato Consortium Kickoff Meeting, Paris 6 09-Nov-2010 Revised, smaller FEE enclosure Flexi connecting the two PCB panels CCD connectors

Plato Consortium Kickoff Meeting, Paris 7 09-Nov-2010 Normal telescope readout sequence 3 s22 s For normal telescope, unshuttered readout gives some image smear For fast telescope, frame transfer time gives some image smear These effects can be corrected if necessary

Plato Consortium Kickoff Meeting, Paris 8 09-Nov-2010 New 2 X 16 bit ADC proposal

Plato Consortium Kickoff Meeting, Paris 9 09-Nov-2010 Fast telecope differences Frame-transfer operation Pixel rate per port 4 Mpix/s, same as normal telescope But CCDs read out in parallel continuously, 2.5 s cadence (so no multiplexing in analogue electronics) High data rate requires local DPU

Plato Consortium Kickoff Meeting, Paris Nov-2010 FIN