THE DETECTOR: T2KB SPECIFICATIONS AND SOFTWARE

The chip normally assigned to the RC Spectrograph is T2KB. This is one of the best chips at the Observatory with ~4 electrons rms readout noise, over 200,000 electrons full-well and excellent quantum efficiency. The default gain setting is 3.2electrons/ADU (gain index:4). This is the gain setting for which the chip has been adjusted for minimum horizonal streaking (7/1995). The radiation event rate for this chip is very significant and results in a maximun practical exposure time of about one hour. It is recommended to take two or three short exposures to properly discriminate against these cosmic-ray events.


CCD Quantum Efficiency Plot

CCD Specifications:

CCD SN                : 1428BR03-01      DATE: 3/9/95
PIXEL SIZE            : 24u x 24u
CHIP SIZE             : 2048 x 2048
DIGITAL LIMITATION    : 32,767
BIAS LEVEL            : ~600
MICROCODE             : T2KB  (CHE-13)
PREFLASH,  e-         : none

AMPLIFIER      :      AMPLIFIER      : D
NOISE,  e-/RMS :      NOISE,  e-/RMS : 4.0
GAIN,   e-/ADU :      GAIN,   e-/ADU : 10.7,8.2,5.4,3.2,2.0,1.1
GAIN,  DETPARS# :     GAIN,  DETPARS# : 1   2   3    4  5    6
LINEARITY,0.1%,e-:    LINEARITY,0.1%,e-: ~220,000
LINEARITY,1.0%,e-:    LINEARITY,1.0%,e-: ~250,000

RADIATION EVENT RATE, EVENTS/HR          : 3000 !!
CONTROL TEMP.      deg C (thermocouple)  : -165.7, -95.9
COMPUTER TEMP.     deg C (ccdinfo)       :
DARK CURRENT,      e-/hr/pix             : <4  (non-MPP)

NOTES                 :  Slight background above bias ~2.2e-.
                      :  Excellent CTE.

DQE   900nm, %       33.1  
DQE   800nm, %       60.3
DQE   700nm, %       79.9
DQE   600nm, %       81.8
DQE   500nm, %       76.5
DQE   405nm, %       64.9
DQE   365nm, %       49.8
DQE   320nm, %       16.0

IRAF-ICE Command Summary:


deveny@noao.edu
Friday, August 4, 1995