UVES Scientific CCD System

The Blue Scientific CCD ( "MARLENE" )

CCD Specification

CCD alias name :	MARLENE
Type :	EEV CCD-44, backside illuminated, AR coated
Number of pixels :	[H] 2048, [V] 4102
Number of outputs :	2
Pixel size :	15 x 15 microns

Cosmetic Defects

Low Level Flat Field Mean number of electrons per pixel » 1.000
Type of Defect :	Location (x,y) :	Number of pixels affected :
Small trap	571,2793	52

Bias Image 0 sec. dark exposure, 104 pixels above 5 s
Type of Defect :	Location (x,y) :	Number of pixels affected :
Hot pixels trail	917,3503	7
Hot pixels trail	946,3518	5
Hot pixels trail	884,3479	8

Long Exposure Dark Images 4 exposures of 3.600 sec. each, 355 pixels above 5 s
Type of Defect :	Location (x,y) :	Number of pixels affected :
Hot pixels horizontal cluster	1946,3995	10
Hot pixels horizontal cluster	946,3518	7
Hot pixels trail	606,1998	20
Hot pixels horizontal cluster	2068,3926	10

Note : Very clean device.

Linearity

Linearity for the left output amplifier :	+ 0.63 / - 0.47 %
Linearity for the right output amplifier :	+ 0.62 / - 0.45 %

Dark Current

Mean dark current < 1.0 ± 0.2 e^-/pixel/hour @ - 120 °C.
Exposure time used in frames : 4 exposures of 3.600 sec. each.

Cosmic Ray Hit Event

Cosmic hit event rate : 0.8 ± 0.4 events/min/cm².

Charge Transfer Efficiency

Vertical CTE to port A/B : 0.9999992 (6 - 9 s);
horizontal CTE to port A/B : 0.9999996 (6 - 9 s).

Bias Level

Adjusted to give around 200 ADU (dark frame).

Full Well

The 16 bit ADC gives 65.335 ADU full well to be multiplied by the conversion factor for the readout mode. This will lead to the full well in electrons.

Readout Direction

In dispersion direction.

Quantum Efficiency @ Temperature : -120 °C

Wavelength [nm]	PRNU	QE [%]
320	2.3	48.9
340	2.1	55.8
360	2.0	58.85
380	1.3	72.3
400	0.9	82.6
450	0.7	88.5
500	0.65	88.3
550	0.62	84.2
600	0.6	83.4

Wavelength [nm]	PRNU	QE [%]
650	0.58	81.0
700	0.58	73.5
750	0.6	64.3
800	0.84	55.1
850	0.7	43.6
900	1.8	28.8
950	4.7	14.2
1000	6.2	4.7
1100	8.0	0.1

Flat Field Image

Flat field image at 550 nm, 5 nm bandwidth.

Back to "UVES Scientific CCD System"

Send comments to <odt@eso.org>
Last update: Jan 27, 2010
Webdesign by EVI