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'Alopeke & Zorro EMCCDs

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'Alopeke & Zorro have two iXon Ultra 888 back-illuminated Electron Multiplying CCDs (EMCCDs).

Type iXon Ultra 888 EX
Size 1024 x 1024
Pixel Size 13 μm
Dark current 0.0002 e-/pix/sec
Well depth 80,000 e-
Linearity better than 99.9%
Timestamp accuracy 10 ns

Minimum Exposure Time (s)
ROI / Binning 1x1 2x2 4x4
1024x1024 0.0562 0.0278 0.0135
512x512 0.0282 0.0140
256x256 0.0144

Read Noise (e-)
EMCCD Amplifier Conventional Amplifier
Readout Speed (MHz) 30 20 10 1 1 0.1
Without EM 130 80 40 12 6 3.5
With EM <1 <1 <1 <1 - -
Transmission curves

Gemini Observatory Participants