Analysis of rocking curve measurements of LiF flight crystals for the objective crystal spectrometer on SPECTRUM-X-GAMMA

I. Halm, H.-J. Wiebicke, U.R.M.E. Geppert, Finn Erland Christensen, Salim Abdali, Herbert W. Schnopper, Oswald H. Siegmund, Oswald H. Siegmund

    Research output: Contribution to journalConference articleResearchpeer-review

    Abstract

    The Objective Crystal Spectrometer on the SPECTRUM-X-GAMMA satellite will use three types of natural crystals LiF(220), Si(111), RAP(001), and a multilayer structure providing high-resolution X- ray spectroscopy of Fe, S, O, and C line regions of bright cosmic X-ray sources. 330 - 360 LiF(220) crystals of dimensions approximately 23 × 63 mm2 are required to cover one side of a large (1000 × 600 mm2) panel, which is to be mounted in front of one of two high throughput X- ray telescopes. Rocking curves of 441 LiF(220) crystals measured by using an expanded Cu - Kα2 beam were analyzed to select the best ones for the flight model. An important parameter is the non-parallelity of the crystal lattice planes with respect to the rear side of the crystals, since it is of the same order of magnitude as the rocking curve width. By lapping the rear side to diminish the non-parallelity and selection the main parameters of the rocking curve averaged over all crystals can be improved at least by a factor of 1.6 both in full width half maximum and peak reflectivity.
    Original languageEnglish
    JournalProceedings of SPIE - The International Society for Optical Engineering
    Volume2006
    Pages (from-to)11-21
    ISSN0277-786X
    DOIs
    Publication statusPublished - 1993
    EventEUV, X-Ray, and Gamma-Ray Instrumentation for Astronomy IV - San Diego, CA, United States
    Duration: 11 Jul 199311 Jul 1993

    Conference

    ConferenceEUV, X-Ray, and Gamma-Ray Instrumentation for Astronomy IV
    LocationSan Diego, CA
    Country/TerritoryUnited States
    Period11/07/199311/07/1993

    Keywords

    • Cosmic rays
    • Crystals
    • Gamma ray spectrometers
    • Lithium compounds
    • Satellites
    • Spectroscopy
    • X ray spectrometers
    • Astronomy
    • A
    • X

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