Kavli Affiliate: Aaron Roodman
| First 5 Authors: John Banovetz, Yousuke Utsumi, Joshua Meyers, Maya Beleznay, Andrew Rasmussen
| Summary:
During electro-optical testing of the camera for the upcoming Vera C. Rubin
Observatory Legacy Survey of Space and Time, a unique low-signal pattern was
found in differenced pairs of flat images used to create photon transfer
curves, with peak-to-peak variations of a factor of 10^-3. A turbulent pattern
of this amplitude was apparent in many differenced flat-fielded images. The
pattern changes from image to image and shares similarities with atmospheric
‘weather’ turbulence patterns. We applied several strategies to determine the
source of the turbulent pattern and found that it is representative of the
mixing of the air and index of refraction variations caused by the internal
camera purge system displacing air, which we are sensitive to due to our flat
field project setup. Characterizing this changing environment with 2-D
correlation functions of the ‘weather’ patterns provides evidence that the
images reflect the changes in the camera environment due to the internal camera
purge system. Simulations of the full optical system using the galsim and
batoid codes show that the weather pattern affects the dispersion of the camera
point-spread function at only the one part in 10^-4 level
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