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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