2.1. Image Defects.

The following images are each the result of stacking five 900s dark frames using an algorithm to reject cosmic rays. They show hot spots and defective columns.



Chip 2 (7461-11-6 ) and Chip 1 (7461-14-6)

Both Images taken with left hand amplifier
 
Mosaic Chip
Bright Columns
locations
Dark Columns
locations
Number of
Hot Spots
CCD1
1391,1359,1676,
1852,1870,2016
2001
634
CCD2
1740
none
55
 

Hot Pixel Maps :-


Chip 2 and Chip 1

Both images taken through left-hand amplifiers.

The cosmic ray count was surprisingly different for the two chips; chip 1 gave 4300 events per hour, chip 2 gave 2500 events per hour.