Mosaic II CCDs

Updated on June 4, 2021, 10:04 am

Here are some test data for the Mosaic II CCDs, as measured by Tom Wolfe in the NOAO/Tucson CCD Lab. All have excellent CTE, dark rate less than 1 e-/pix/hour at -90C, and charge injection of 1-2 electrons if a reverse vertical clear is done prior to integration. When reading the QE figures, remember that the 4-m prime focus corrector does not transmit below 3300A.

CCD# 21 22 25 26 27 28 29 31
Gain e-/adu (8 us ) Amp A: 2.18 2.34 1.72 1.78 1.70 1.70 1.63 1.85
Gain e-/adu (8 us ) Amp B: 1.78 2.23 1.78 1.73 1.69 1.64 1.68 1.73
Noise e-(8 us dwell) Amp A: 5.4 5.4 3.8 4.0 4.0 4.1 3.4 4.4
Noise e-(8 us dwell) Amp B: 4.8 5.7 4.7 4.6 4.4 4.0 4.2 3.5
Fullwell  Ke-: 90 69 82 80 63 64 63 83
QE % at 3000A:   9     8 9 9 8
QE % at 3340A:   18 19 18 17 18 18 17
QE % at 3650A: 48 51 44 49 46 48 48 46
QE % at 4050A: 65 69 72 69 65 69 67 69
QE % at 6000A: 82 85 89 88 84 88 86 85
QE % at 8000A: 61 70 71 70 69 68 69 70
QE % at 9000A: 37 42 40 53 41 39 39 41
QE % at 10000A:   13 10 11 11 11 11 12
# of full column defects: 0 2 1 1 2 0 1 0
# of partial column defects: 1 2 0 9 1 0 6 0