Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988spie..982..273f&link_type=abstract
IN: X-ray instrumentation in astronomy II; Proceedings of the Meeting, San Diego, CA, Aug. 15-17, 1988 (A89-40276 17-35). Bellin
Astronomy and Astrophysics
Astrophysics
5
Gratings (Spectra), X Ray Astronomy, X Ray Astrophysics Facility, X Ray Spectroscopy, Imaging Spectrometers, Spatial Filtering, Ultraviolet Lasers
Scientific paper
The performance of high spatial frequency 'phased' X-ray transmission gratings developed for the High Energy Transmission Grating Spectrometer on the Advanced X-ray Astrophysics FAcility (AXAF) is examined. The gratings tested here nominally consist of 1-micron-thick gold lines of 0.2 micron period covering approximately 5 sq cm of a polyimide membrane. A table-top setup at MIT employs the gratings in reflection to diffract UV (325 nm) laser light. It is used to measure grating periods and indicates that period variations within and between gratings are a few parts in 10,000. Tests performed at the Marshall Space Flight Center 304 m X-ray Facility using 1.5 keV X-rays in transmission corroborate the UV measurements and demonstrate geometrically-limited resolving powers of E/Delta E about 750. Finally, X-ray transmission tests performed in the MIT 25 m X-ray facility provide measurements of period, line thickness, space-to-period ratio, tilt of grating lines, and efficiency.
Dewey Dan
Fischbach K. F.
Levine Alan M.
Renshaw R. L.
Schattenburg Mark L.
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