AXAF CCD Imaging Spectrometer
ACIS, 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.
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