Mosaic II CCDs
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 |
Updated on June 4, 2021, 10:04 am