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19 November 1998 X-ray tests and calibrations of the ABRIXAS mirror systems
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ABRIXAS is a German satellite project - to be launched in spring 1999 - which will perform the first imaging x-ray all-sky survey in the 0.5-10 keV band thus being a complement to the ROSAT all-sky which covered the 0.1-2.4 keV range. Its telescope consists of seven mirrors modules, each with a diameter of 16 cm and a focal length of 160 cm. the mirror modules are tested and calibrated at the MPE X- ray test facility PANTER. Several mirrors from the qualification program and one flight module have been tested and calibrated up to now. The imaging performance of the optics was successively improved until the flight module reached an on-axis resolution of 22 arcseconds. The total scattering level at 8 keV is about 16 percent for two reflections which indicates a microroughness of less than 0.5 nm. The measured on-axis effective area of one flight mirror module is 81 cm2 at 1.5 keV and 25 cm2 at 8 keV. These values indicate that the reflectivities of the mirror surface are on the average about 92 percent of the theoretical expectation.
© (1998) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Peter Friedrich, Heinrich W. Braeuninger, Wolfgang Burkert, Thorsten Doehring, Roland Egger, Gunther Hasinger, Andreas Oppitz, Peter Predehl, and Joachim E. Truemper "X-ray tests and calibrations of the ABRIXAS mirror systems", Proc. SPIE 3444, X-Ray Optics, Instruments, and Missions, (19 November 1998);


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