Advanced CCD Imaging Spectrometer
ACIS (formerly the AXAF CCD Imaging Spectrometer) is an instrument built by a team from the Massachusetts Institute of Technology's Center for Space Research and the Pennsylvania State University for the Chandra X-ray Observatory (formerly, AXAF). Because of its ability to accurately measure the energy of single photons, it serves as an X-Ray integral field spectrograph for Chandra.
The CCD sensors of ACIS operate at -120 Celsius and its filters at -60 and -50 degrees Celsius.[1] ACIS has a special heater that allows contamination from Chandra to be baked off.[2] It was part of the design of Chandra to have lubricants, and the ACIS design took this into account with ability to clean its sensors.[3] The contamination can reduce the sensitivity to X-ray light.[4]
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