Abstract
The Large Synoptic Survey Telescope (LSST) focal plane consists of 21 autonomous modules [raft tower modules (RTMs)], each of which contains nine thick, fully depleted 4k × 4k CCDs with associated control and readout electronics. To enable LSST’s repetitive short-exposure cadence while maintaining high duty factor and low read noise, the readout is highly parallelized into 3024 independent video channels (16 per CCD and 144 per RTM). Two vendors supplied the LSST sensors; the devices have compatible mechanical and electrical interfaces and meet the same electro-optic specifications, but each RTM is constructed with sensors from a single supplier. The full complement of rafts was assembled at Brookhaven National Laboratory during January 2017 to January 2019. Each unit underwent extensive electro-optic and metrology characterization at operating temperature, the results of which are presented here along with a discussion of uniformity and stability.
Highlights
The Large Synoptic Survey Telescope (LSST) is a next-generation imaging instrument with 320 m2 deg[2] etendue, designed to carry out a 10-year survey targeting dark matter and dark energy, solar system and Milky Way populations, and optical transients.[1]
The 3.2-Gpixel LSST camera, developed by a US Department of Energy collaboration, will have a science array of 189 fully depleted CCDs arranged in 21 submodules called raft tower modules (RTMs)[2,3] making it the largest digital camera far built for astronomical research
CCD temperatures were controlled by the RTM’s internal thermal control loop, whereas the electronics were cooled by conduction to a cold plate stabilized to −60°C
Summary
The Large Synoptic Survey Telescope (LSST) is a next-generation imaging instrument with 320 m2 deg[2] etendue, designed to carry out a 10-year survey targeting dark matter and dark energy, solar system and Milky Way populations, and optical transients.[1] The 3.2-Gpixel LSST camera, developed by a US Department of Energy collaboration, will have a science array of 189 fully depleted CCDs arranged in 21 submodules called raft tower modules (RTMs)[2,3] making it the largest digital camera far built for astronomical research.
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