X-Shooter CCD Detector System: Optomechanical Requirements for the CCDs
| Item | Requirements | Obtained Results | |
UVB Arm |
VIS Arm |
||
| BFD (= The distance of the average CCD surface to the reference flange (mounting surface of field lens)). |
9.125 ± 0.125 mm | 9.136 mm | 9.135 mm |
| Centering (= The distance between the optical center of the chip (not taking into accountpossible overscan pixels) and the mechanical axis of the dewar.) |
< 0.5 mm | - | - |
| P-V flatness (= The distance of the two planes, parallel to the reference flange, between which the sensitive surface of the chip or mosaic is contained. Applies to optical field size only.) |
< 20 microns | - | 25 microns |
Flatness Measurements at 153 K (VIS Arm)
| rms | pv | |
| Analysis of the window back side: | 0.0021 | 0.0064 |
| Analysis of the chip: | 0.0064 | 0.0251 |
| Chip relative to the best fit plane of the window: | 0.0148 | 0.0626 |
Topography of MIT/LL CCID-20 with respect to the window backside at 153 K
(pv = 0.0626 mm)
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