And finally it maintains all this hardware in a clean, contaminant-free, high-vacuum environment.
It also provides cooling (to minus 30 degrees Fahrenheit) for the sensors' readout electronics, which reside just behind the focal plane. The cryostat provides the optical bench - a silicon carbide grid - that keeps the large focal plane, which is 65 centimeters in diameter and composed of 189 CCD imaging sensors, flat to within just a tenth of the width of a human hair, while uniformly cooling it to minus 150 degrees Fahrenheit. It’s being assembled at the Department of Energy’s SLAC National Accelerator Laboratory. With 3.2 gigapixels, the LSST camera will be the largest digital camera ever built for ground-based astronomy. Work on the camera for the future Large Synoptic Survey Telescope (LSST) has reached a major milestone with the completion and delivery of the camera’s fully integrated cryostat.
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