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Proceedings Paper

Development Of Imaging X-Ray Telescopes At Max-Planck-Institut Garching
Author(s): Joachim Trumper; Bernd Aschenbach; Heinrich Brauninger
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Paper Abstract

A few years ago, a program for development of space instrumentation for soft X-ray astronomy has been initiated at MPI. It includes the design and fabrication of imaging X-ray telescopes which is done in close cooperation with Carl Zeiss/W.-Germany. After an extensive survey of various materials and polishing techniques applied to flat mirror samples, first paraboloidal mirrors were built each having a frontal diameter of 15 cm and a length of 1 m. A bundle of 12 such mirrors was flown twice on Aries rockets. The next step was the design and production of a Wolter type I telescope compatible with being used on a Skylark or Black Brant rocket. Actually, three of these telescopes were built. The mirror material is aluminium, plated with kanigen and coated with a reflecting gold layer. Each has an aperture diameter of 32 cm and a focal length of 143 cm. They were tested in MPI's short beam X-ray test facility and show nominal reflectivity, on-axis angular resolution of 5 arc sec (FWHM), and extraordinary low surface scattering of 6 I at 1 keV. Currently, a nested 80 cm diameter Wolter type I telescope of 240 cm focal length is being designed. The mirrors will be made from zerodur, a glass ceramic which has excellent thermal properties, low residual mechanical stresses as opposed to aluminium, and the ability to be polished to high surface finish. X-ray tests of the telescope will be performed in MPI's long beam (130 m) facility just under construction.

Paper Details

Date Published: 9 August 1979
PDF: 8 pages
Proc. SPIE 0184, Space Optics Imaging X-Ray Optics Workshop, (9 August 1979); doi: 10.1117/12.957429
Show Author Affiliations
Joachim Trumper, Institut fur Extraterrestrische Physik (Germany)
Bernd Aschenbach, Institut fur Extraterrestrische Physik (Germany)
Heinrich Brauninger, Institut fur Extraterrestrische Physik (Germany)

Published in SPIE Proceedings Vol. 0184:
Space Optics Imaging X-Ray Optics Workshop
Martin C. Weisskopf, Editor(s)

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