Characterizing Temperature Variations in the Large Synoptic Survey Telescope Camera

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We have measured how the temperature varies on a science raft for the Large Synoptic Survey Telescope (LSST) Camera, and have made preparations to repeat this test on the full Camera focal plane. Such tests are important in order to ensure that the LSST Camera behaves as expected in response to temperature changes, and in particular that spurious spatial patterns are not introduced into near-IR observations due to a spatially varying temperature profile. We describe first the construction of a Flat Field Projector that will be used to conduct a wide array of tests on the LSST Camera Focal Plane, including a test of temperature variation. Then we proceed to describe a pilot version of this test, in which a single LSST science raft was illuminated with flat fields at several temperatures and wavelengths. After developing several methods of removing fringe artifacts from these images we calculate the temperature variation, and find that the variation of the spatial pattern of temperature on a single raft is less than 0.25K when the bulk temperature is changed 10K, somewhat better than the specification of 0.5K variation.


Type of resource text
Date created May 19, 2018


Author Rosenberg, Erik
Degree granting institution Stanford University, Department of Physics
Primary advisor Roodman, Aaron J.
Advisor Burchat, Patricia


Subject LSST
Subject Large Synoptic Survey Telecope
Subject Astronomy
Subject Astronomical Instrumentation
Subject CCD
Genre Thesis

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Rosenberg, Erik. (2018). Characterizing Temperature Variations in the Large Synoptic Survey Telescope. Stanford Digital Repository. Available at:


Undergraduate Theses, Department of Physics

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