A focussing iron line crystal spectrometer for SpacelabA 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.
Document ID
19770062924
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Catura, R. C. (Lockheed Research Laboratories Palo Alto, Calif., United States)
Culhane, J. L. (Lockheed Missiles and Space Co. Palo Alto, CA, United States)
Rapley, C. G. (London, University College, Dorking, Surrey, United Kingdom)
Gabriel, A. H. (Atomic Energy Research Establishment, Culham Laboratory, Abingdon Oxon, United Kingdom)
Walker, A. B. C., Jr. (Stanford University Stanford, Calif., United States)
Woodgate, B. E. (NASA Goddard Space Flight Center Greenbelt, Md., United States)