UVES Scientific CCD System - Detector Design and Performance Report

The Red Scientific CCDs ("Sting" and "Zeus")

(See also the Data for UVES Red before the upgrade on 15/Jul/2009)

CCD Specifications

CCD alias name	Sting	Zeus
Type	e2v CCD-44, back illuminated, AR coated (single layer)	MIT/LL CCID-20-4-10-2, 40 μm thick, high resistivity, deep depletion, back illuminated
Number of pixels	[H] 2048, [V] 4102	[H] 2048, [V] 4096
Number of outputs	2
Pixel size	15 x 15 microns	15 x 15 microns

Cosmetic Defects of e2v CCD-44 ("Sting")

Note: Pattern visible on the CCD surface like rests of evaporation from e2v.

Cosmetic Defects of MIT/LL CCID-20 ("Zeus")

Long Exposure Dark Images
5 exposures of 3600 s each

Type of defect: 2 Hot columns, caused by hot pixels

Location (x, y):	Number of pixels affected:
1253, 917	3178
1973, 3173	922

5 long dark median

5 bias median

Linearity of e2v CCD-44 ("Sting")

Linearity for the left output amplifier:	+ 0.20/-0.35 %	0 - 62.000 ADU
Linearity for the right output amplifier:	+ 0.20/-0.35 %	0 - 62.000 ADU

Linearity of MIT/LL CCID-20 ("Zeus")

For linearity tests a set of Bias frames was taken followed by pairs of FF of different exposure times to explore almost the complete dynamic range provided by the ADC (65535 ADUs).

50 Kps, 2 x 2, hg
225 Kps, 1 x 1, lg

Result: The CCD plus electronics residual non-linearity is less than ± 0.5 %.

Dark Current

e2v CCD-44 ("Sting")	MIT/LL CCID-20 ("Zeus")
Mean dark current < 1.0 ± 0.1 e-/pixel/hour @ - 120 °C	Mean dark current < 0.9 ± 0.1 e-/pixel/hour @ - 138 °C

Cosmic Ray Hit Event

e2v CCD-44 ("Sting")	MIT/LL CCID-20 ("Zeus")
(not measured)	1144 hits/cm2/hour (Paranal)

Charge Transfer Efficiency (CTE)

	MIT/LL CCID-20 ("Zeus")	e2v CCD-44 ("Sting") + MIT/LL CCID-20 ("Nigel") (before the upgrade)
Vertical CTE	0.999999	> 0.999999 (6 - 9 s), port A/B
Horizontal CTE	0.9999967	> 0.999999 (6 - 9 s), port A/B

Quantum Efficiency

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