27 November 1989 An Optical Test And Alignment Method For The XMM Mirror Module
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Abstract
XMM is a highly nested (58 individual shells) Wolter-I type X-ray telescope with a focal length of 7.5 m consisting of 3 individual modules. The specified resolution (HEW) is 30 (goal 15) arcsec. In order to qualify single mirror shells and align and assemble the whole mirror module in a reasonable time it is inevitable to apply fast test and strongly converging alignment procedures. By means of two scanning laser beams intra- and extrafocal images of two mirror shells will be registered on a CCD-camera coupled to an image processing PC. One of the mirrors is already glued and serves as a reference while the second one has to be aligned yet. From the data axial and lateral focus positions as well as focus dimensions are calculated. A feed back loop then shall activate a set of actuators coupled to the mirror to be aligned. In an iterative way the alignment status of this mirror will be optimized. Finally, this mirror is cemented under optical control. First results from a basic test setup with only one mirror will be presented. The work is performed under ESA contract for XMM.
© (1989) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
M. Schmidt, M. Schmidt, K. Beckstette, K. Beckstette, U. Dinger, U. Dinger, P. Kaufmann, P. Kaufmann, "An Optical Test And Alignment Method For The XMM Mirror Module", Proc. SPIE 1159, EUV, X-Ray, and Gamma-Ray Instrumentation for Astronomy and Atomic Physics, (27 November 1989); doi: 10.1117/12.962617; https://doi.org/10.1117/12.962617
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