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RED+4 Parameters with UltraDAS + SDSU Gen.3

Device Identification

Chip name Red+4
Year of manufacture 2011
Serial number 08443-22-01
Britannia number 500625
First light on La Palma 20th May 2013
Description Deep Depletion with additional fringe suppression and an AR coating peaking at 900nm.

Chip type CCD231-84

Operational Characteristics

Speed  Slow Fast
Bias(ADU) 3180


Gain(e/ADU) 0.69
Read noise(e) 4.2
Read noise(ADU) 6.0 5.6
Linear to(ADU) 
{also see graphs below}

<1% to 60K

<1% to 60K

Readout time (s) binned 1 x 1

50 39
Readout time(s) binned 2 x 2 18


Windowing  : available with no reduction in performance.

Binning : available with no reduction in performance.
Vertical CTE 0.999998
Horizontal CTE  0.999996

Physical Characteristics

X Pixel size 15 microns
Y Pixel size 15 microns
X size in pixels of digitised area 4196
Y size in pixels of digitised area 4112
X size of useful imaging area 4096
Y size of useful imaging area 4112
X start of useful imaging area 50
Ystart of useful imaging area 1
LN2 capacity of cryostat 2.5 litres
Cryostat window thickness 5 mm
Distance from window to CCD 10 mm
Cryostat window size 100 mm diameter

Operational Parameters

Flooding type none
Operating temperature 158K
Cool down time 4 hours see graph
Preferred amplifier  F (all are good)

Measured Characteristics



This graph shows fringing for Red+4 (red) and it's predecessor the WHTWFC (blue).

Dark current 6 e/pix/hour
Chip flatness 5 microns peak to valley

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Last Modified: 27 March 2014