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Plato CCD and Front-End Electronics

Plato CCD and Front-End Electronics. Dave Walton UCL/MSSL dmw @mssl.ucl.ac.uk 01483 204190. 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

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Plato CCD and Front-End Electronics

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  1. Plato CCD and Front-End Electronics Dave Walton UCL/MSSL dmw@mssl.ucl.ac.uk 01483 204190

  2. 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

  3. Focal plane coverage

  4. CCD progress – package and connections Flexi length 120 mm. Trade-off between thermal isolation and bandwidth/interference

  5. CCD Parameters • 4510 x 4510 pixels per CCD18 µm pixel81.2 x 81.2 mm2 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 m2Largest CCD area ever flown (?) Gaia CCD at MSSL Plato CCD is x2.4 larger In area

  6. Revised, smaller FEE enclosure CCD connectors Flexi connecting the two PCB panels

  7. Normal telescope readout sequence 3 s 22 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

  8. New 2 X 16 bit ADC proposal

  9. 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

  10. FIN

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