X-Shooter CCD Detector System: VIS Arm - The Red Scientific CCD

CCD Specification

CCD nickname:	Catherine
Type:	MIT/LL CCID-20, backside illuminated, AR coated
Number of pixels:	[H] 2048, [V] 4096
Number of outputs:	2
Pixel size:	15 x 15 microns

Cosmetic and Flat Field Images

Flat field images at

• 5 different wavelengths: 350 nm, 475 nm, 600 nm, 750 nm and 900 nm
• 2 different illumination levels: high level (45000 ADU) and low level (1000 ADU)
• 2 different read out speeds: 100 kps 1 x 1 bin and 400 kps 1 x 1 bin
• Bandwidth: 10 nm

350 nm	475 nm	600 nm	750 nm	900 nm
high level   100 kps 1 x 1 bin   high gain
low level   100 kps 1 x 1 bin   high gain
high level   400 kps 1 x 1 bin   low gain
low level   400 kps 1 x 1 bin   low gain

Linearity

Peak to peak non linearity: 0.8 %

Dark Current

Exposure time:	3600 s
Readout mode:	100 kpix/s
Port:	left
Minimum specification:	2 e-/pix/h
Dark current:	< 0.8 ADU/pix/h, < 0.5 e-/pix/h

Bias Images for Various Readout Modes

100kpix/s 1 x 1 bin high gain	100kpix/s 1 x 2 bin high gain	100kpix/s 2 x 2 bin high gain	400kpix/s 1 x 1 bin low gain

Dark Images for Various Readout Modes

100kpix/s 1 x 1 bin high gain	100kpix/s 1 x 2 bin high gain	100kpix/s 2 x 2 bin high gain	400kpix/s 1 x 1 bin low gain
Exposure time = 15 min.
Exposure time = 1 h

Charge Transfer Efficiency (CTE)

Method used:	Deferred Charge
Minimum specification:	0.999995
CTE serial (horizontal) left:	0.999997
CTE parallel (vertical):	0.9999998

CTE measured at 400 kpix/s and the low gain amplification.

Full Well

Full well is more than 120.000 electrons.

Readout Direction

In dispersion direction.

Quantum Efficiency @ Temperature 158 K (estimated)

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