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A small‐angle camera for resonant scattering experiments at the storage ring DORIS
Author(s) -
Stuhrmann H. B.,
Gabriel A.
Publication year - 1983
Publication title -
journal of applied crystallography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.429
H-Index - 162
ISSN - 1600-5767
DOI - 10.1107/s0021889883011000
Subject(s) - storage ring , optics , monochromator , scattering , monochromatic color , wavelength , wiggler , detector , physics , resolution (logic) , beam (structure) , quantum mechanics , artificial intelligence , cathode ray , computer science , electron
Resonant small‐angle scattering is measured routinely in the wavelength range of 0.6 to 3.25 Å with the instrument X15 at the storage ring DORIS. The monochromatic beam with a vertical offset of 1.22 m is achieved by a double monochromator system with a constant exit slit. The small‐angle instrument allows for sample‐detector distances between 0.37 and 7.33 m. A multiwire proportional counter with a sensitive area of 200 × 200 mm detects the scattered intensity with a spatial resolution of 2 × 2 mm. Its sensitivity can be adapted to the requirements of the experiment by activating a drift chamber of 8 cm depth at the back end of the detector. The performance of the instrument as a function of the wavelength is described. The energy resolution is about 1 eV at the L 3 absorption edge of caesium, as shown by the resonant scattering of ferritin in 30% CsCl solution.