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Proceedings Paper

Grazing Incidence Telescopes For Satellite Borne UV And X-Ray Astronomy Missions Including ROSAT, XMM and Lyman
Author(s): Bernd Aschenbach
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Paper Abstract

Grazing incidence telescopes have been in use for quite some time for X-ray applications. High resolution Wolter type I telescopes have been flown on board of Skylab, the Einstein and the EXOSAT satellites. ROSAT will he the next space borne observatory, which will perform for the first time a complete sky survey by means of a large high resolution grazing incidence X-ray telescope. The design and fabrication of the mirror assembly are presented including metrology measurements and full aperture X-ray tests. The X-ray image of the fully assembled prototype model shows a measured radius of 2.0 arcsec and 3.2 arcsec for the 50 (7.') and 80 encircled energy, respectively. Metrology measurements of the not yet assembled flight mirrors indicate an even better performance including microroughness of 2.6 Å rms. A cluster of highly nested Wolter type I telescopes has been proposed for ESA's future X-ray astronomy cornerstone mission XIM. The optical design of the mirror assembly optimized to high throughput but moderate re-solution is presented. Although originally proposed for X-rays grazing incidence telescopes start to be preferred for use at longer wavelengths due to the lack of high reflectivity coatings throughout the region from the X-rays to the UV at '- 1000 Å. The future UV astronomy mission Lyman selected for an industrial Phase-A study by ESA utilizes a Wolter. Schwarzschild type II telescope which feeds a high resolution (λ/Δλ = 30.000) spectrograph covering the 900 - 1200 Å region. The optical design of the telescope is described and the error budget for the manufacturing of the 1 arcsec telescope is discussed.

Paper Details

Date Published: 1 January 1986
PDF: 17 pages
Proc. SPIE 0733, Soft X-Ray Optics and Technology, (1 January 1986); doi: 10.1117/12.964910
Show Author Affiliations
Bernd Aschenbach, Institut fur extraterrestrische Physik (W-Germany)

Published in SPIE Proceedings Vol. 0733:
Soft X-Ray Optics and Technology
E. Koch; Guenther A. Schmahl, Editor(s)

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