Physics – Optics
Scientific paper
Jun 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977cosp.meets....c&link_type=abstract
COSPAR, Plenary Meeting, 20th, Tel Aviv, Israel, June 7-18, 1977, Paper. 4 p.
Physics
Optics
Cosmic X Rays, Focusing, Lithium Fluorides, Radiation Detectors, Spacelab, X Ray Spectroscopy, Crystal Optics, High Resolution, Iron, Line Spectra, Mounting, Proportional Counters, Satellite-Borne Instruments, Spectral Resolution
Scientific paper
A crystal spectrometer system is described which employs conical focusing of 12 curved LiF crystal panels to minimize the detector size and reduce the background counting rate. The wavelength range from 1.70 to 1.98 A is covered, including the resonance lines of Fe XXV and Fe XXVI as well as the Fe I K-alpha line and absorption edge. Operation of the spectrometer is discussed, noting that diffracted X-rays are registered in one-dimensional position-sensitive detectors and that the arrival position of a photon in a detector is related to its wavelength due to the fixed curvature of the crystal panels in the dispersion plane. Some characteristics of the multianode position-sensitive detectors are reviewed along with the crystal arrangement and mounting. The instrument sensitivity is evaluated in relation to the strengths of 6.7-keV emission features detected by the Ariel 5 and OSO 8 proportional-counter spectrometers.
Catura Richard C.
Culhane Leonard J.
Gabriel Alan H.
Rapley C. G.
Walker Arthur B. C. Jr.
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