Advanced CCD Imaging Spectrometer
The 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.
ACIS is a focal plane instrument that uses an array of charge-coupled devices. It serves as an X-ray integral field spectrograph for Chandra. The instrument is capable of measuring both the position and energy of incoming X-rays.[1]
The CCD sensors of ACIS operate at Script error: No such module "convert". and its filters at Script error: No such module "convert".. It carries a special heater that allows contamination from Chandra to be baked off; the spacecraft contains lubricants, and the ACIS design took this into account in order to clean its sensors. Contamination buildup can reduce the instrument's sensitivity.[2] Radiation in space is another potential danger to the sensor.[3]
since 2014[update]Template:Dated maintenance category (articles)Script error: No such module "Check for unknown parameters"., after 15 years of operation, there was no indication of a limit to the lifetime of ACIS. Another design feature of the instrument was a calibration source that can be used to understand its health. This allows for a measurement of the level of contamination, if present, as well as any degree of charge transfer inefficiency.[3]
References
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External links
- ACIS website Template:Webarchive by the Massachusetts Institute of Technology
- ACIS website by Pennsylvania State University
- The Chandra Proposers' Observatory Guide by the Smithsonian Astrophysical Observatory