Imaging performance of a normal incidence soft X-ray telescope

Details Imaging performance of a normal incidence soft X-ray telescope Imaging performance of a normal incidence soft X-ray telescope

Publishing date

Jan 1982

URL

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982apphl..40...25h&link_type=abstract

Journals

Applied Physics Letters, vol. 40, Jan. 1, 1982, p. 25-27.

Science

Physics

Additional info 2

18

Additional info 3

Grazing Incidence, Image Resolution, Protective Coatings, Spectral Reflectance, X Ray Imagery, X Ray Telescopes, Brightness Distribution, Field Of View, High Resolution

Type

Scientific paper

Abstract

Measurements are presented of the imaging performance of a normal incidence spherical soft X-ray mirror at BK-alpha (67.6 A). The reflector was a 124-layer coating consisting of alternating Re-W alloy and C layers with a protective C overcoat 34 A thick deposited on a Zerodur substrate. Measurements made at an angle of 1.5 deg off axis with the prototype of the Einstein Observatory high resolution imager reveal the resolution of the mirror to be about 1 arcsec FWHM, with 50% of the reflected power within the detector field of 512 arcsec contained within a diameter of 5 arcsec. The data demonstrate the practicality and potential good performance of normal-incidence soft X-ray optics, and show that the scattering performances of such devices may be as good or better than the best grazing incidence devices.

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