Characterization of thin film CCD filters on board the German astronomy satellite ABRIXAS by soft x-ray transmission measurements

Details Characterization of thin film CCD filters on board the German astronomy satellite ABRIXAS by soft x-ray transmission measurements Characterization of thin film CCD filters on board the German astronomy satellite ABRIXAS by soft x-ray transmission measurements

Jun 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999aipc..475..600s&link_type=abstract

The fifteenth international conference on the application of accelerators in research and industry. AIP Conference Proceedings,

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X-Ray, Mossbauer, And Other Gamma-Ray Spectroscopic Analysis Methods, X- And Gamma-Ray Telescopes And Instrumentation

Scientific paper

We have developed optical filters for the German X-ray astronomy satellite ABRIXAS (A BRoadband Imaging X-ray All Sky Survey)(1). Specific CCD's (2) will be used as detectors in the focal plane on board the observatory. Since these detectors are sensitive from the X-ray to the near infrared spectral range, X-ray observations require optical filters, which combine high transmittance for photon energies in the soft X-ray region and a high absorptance for ultraviolet and visible radiation. With respect to the mission goal in orbit a spectral transmission function is required attenuating radiation below photon energies of 10 eV by more than 7 orders of magnitude and transmitting soft X-ray photon energies above 1000 eV by more than 90 percent. This was realized by a 0.80 μm thick polypropylene foil, which is coated with approximately 60 nm aluminum on both sides. The filters have an effective diameter of 73 mm without any support structure. Environmental tests have been performed and proved the filters to be resistant against sound pressure and vibrational load stresses during the launch of the spacecraft. Synchroton radiation was used to characterize the properties of the filters in the soft X-ray photon energy range 60 eV

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