NTT / Emmi-Blue/ CCD Tek #31

TYPE	Tektronix TK1024 AB Grade 1
	Thin, back-illuminated, AR coated, MPP mode
IMAGE SIZE [pixels]	1024 x 1024 (50 prescan pixels)
PIXEL SIZE [microns]	24 x 24
DARK CURRENT [ e- /pixel / hr]	21.5 at 166 ° K
FULL WELL CAPACITY [e- / pixel]	245k
CONTROLLER	ACE
Mode	slow [32 kpixel / sec]	fast [52 kpixel / sec]
R.O.N. [e- rms]	4.5	6.2
CONVERSION FACTOR [ e- / ADU]	1.7	3.4
Full Frame READOUT TIME [sec]	44	30

Cryostat hold time of about 22 hours.

Set operating temperature in the range 160÷175 for optimal UV quantum efficiency and low dark current.

Faint pattern visible in fast mode bias

All figures given for amplifier D (see Additional Information)

Quantum efficiency

[QE 31 curve]

       lambda (nm)  QE (%)
	 320        19.8
         340        30.5
         360        43.2
         380          59
         400        70.4
         450        67.5
         500        71.7
         550        76.5
         600        78.1
         650        76.2
         700        72.3
         750        61.9
         800        52.6
         850        37.9
         900           0
         950        14.4
        1000         5.9

Noise and Gain

Amplifier A:

Mode	slow [25 kpixel / sec]	fast [37 kpixel / sec]
R.O.N. [e- rms]	4.9	8.3
CONVERSION FACTOR [ e- / ADU]	1.5	2.7

NOTE:

All the tests below have been performed with the Garching-lab VME CCD controller in slow-mode except otherwise noted.

Charge Transfer Efficiency

The CTE was measured using Flat Field exposures and its over-scan regions and gives:

A-amplifier:: Serial CTE = 0.999992 and Parallel CTE = 0.9999983

Full Well Capacity

A-amplifier:: Upper limit of linearity: 245k e-/pixel; Saturation-value: 275k e-/pixel

Cosmic Ray Event

The cosmic ray event rate is 3.8 [events/min/cm²]

The value is higher than that of other CCD-types, probably due to the very high quantum efficiency.

Shutter Error

Slow mode: 0.54sec
Fast mode: 0.55 sec

Cosmetics

Measured with A amplifier.

On high light level exposures no significant blemishes have been noticed.
On weak light level exposures 8 small traps, each of which less than 20 pixels wide, have been discovered.
On longer dark exposures, for temperatures T > 180 °K, 3 small warm spots have been noticed.

1 hot pixel at (X,Y)=(785,878)

152 cold pixels inside the area (X1,Y1;X2,Y2)=(50,3;1075,1023)

The flat fields show a low row every 43. This is due to the way this CCD has been manifactured.

History

Date of delivery at the telescope:
Date of last set of tests: December, 1996

Tests on September 5, 1995
DARK CURRENT [ e- /pixel / hr] ~10.03 at 166 ° K

CONTROLLER ESO VME

Mode slow [16 kpixel / sec] fast [23 kpixel / sec]

R.O.N. [e- rms] 4.28 5.5

CONVERSION FACTOR [ e- / ADU] 1.71 3.5

Pre ACE upgrade

Mode slow [16 kpixel / sec] fast [23 kpixel / sec]

R.O.N. [e- rms] 4.47 6.24

CONVERSION FACTOR [ e- / ADU] 1.7 3.4

Full Frame READOUT TIME [sec] 106 60

**Tests on September 5, 1995**
DARK CURRENT [ e- /pixel / hr]	~10.03 at 166 ° K
CONTROLLER	ESO VME
Mode	slow [16 kpixel / sec]	fast [23 kpixel / sec]
R.O.N. [e- rms]	4.28	5.5
CONVERSION FACTOR [ e- / ADU]	1.71	3.5
Pre ACE upgrade
Mode	slow [16 kpixel / sec]	fast [23 kpixel / sec]
R.O.N. [e- rms]	4.47	6.24
CONVERSION FACTOR [ e- / ADU]	1.7	3.4
Full Frame READOUT TIME [sec]	106	60

Image Files

Bias Frame (fits-file, 4.5 MB)

Flat Field Frame (fits-file, 4.5 MB)

NTT / Emmi-Blue/ CCD Tek #31

lambda (nm) QE (%) 320 19.8 340 30.5 360 43.2 380 59 400 70.4 450 67.5 500 71.7 550 76.5 600 78.1 650 76.2 700 72.3 750 61.9 800 52.6 850 37.9 900 0 950 14.4 1000 5.9

NOTE: