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  • International Union of Crystallography (IUCr)  (4)
  • 1995-1999  (4)
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Publisher
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Year
  • 1
    Electronic Resource
    Electronic Resource
    Design optimization of a flexural hinge-based bender for X-ray optics (1998)
    Chester : International Union of Crystallography (IUCr)
    Journal of synchrotron radiation 5 (1998), S. 804-807 
    Details
    ISSN: 1600-5775
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: This paper presents a parameter study and design optimization of a flexural hinge-based bender by use of finite-element modelling and analytical formulation. The relationship between the mirror shape and the driving forces, the so-called bender driving equation, is established. Various parameters are investigated: the material properties, the geometrical parameters, the stress and deformation of the mirror and flexural hinge, the residual slope error of the mirror, and the resolution required for the actuators. Analysis results have been compared with test results for a prototype bender and a silicon mirror (170 × 40 × 10 mm). Both analysis and test results confirm the microradian accuracy of the bent mirror. Finally, a bender design for short-bending-radius applications is also presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0909049597015288
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Focusing Optics for High-Energy X-ray Diffraction (1998)
    Chester : International Union of Crystallography (IUCr)
    Journal of synchrotron radiation 5 (1998), S. 226-231 
    Details
    ISSN: 1600-5775
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: Novel focusing optical devices have been developed for synchrotron radiation in the energy range 40–100 keV. Firstly, a narrow-band-pass focusing energy-tuneable fixed-exit monochromator was constructed by combining meridionally bent Laue and Bragg crystals. Dispersion compensation was applied to retain the high momentum resolution despite the beam divergence caused by the focusing. Next, microfocusing was achieved by a bent multilayer arranged behind the crystal monochromator and alternatively by a bent Laue crystal. A 1.2 µm-high line focus was obtained at 90 keV. The properties of the different set-ups are described and potential applications are discussed. First experiments were performed, investigating with high spatial resolution the residual strain gradients in layered polycrystalline materials. The results underline that focused high-energy synchrotron radiation can provide unique information on the mesoscopic scale to the materials scientist, complementary to existing techniques based on conventional X-ray sources, neutron scattering or electron microscopy.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0909049598001393
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  • 3
    Electronic Resource
    Electronic Resource
    High-Frequency X-ray Beam Chopper Based on Diffraction by Surface Acoustic Waves (1998)
    Chester : International Union of Crystallography (IUCr)
    Journal of synchrotron radiation 5 (1998), S. 1357-1362 
    Details
    ISSN: 1600-5775
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: The diffraction of an X-ray beam on an ultrasonic wave propagating at the surface of a crystal gives rise to diffraction satellites whose temporal structure is correlated to that of the ultrasonic wave. By matching the temporal structure of the surface acoustic wave with the filling mode of the storage ring, it is possible to select or reject the incident X-ray pulses. A few examples of the performance of this MHz-range chopper for various filling modes are presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0909049598008437
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  • 4
    Electronic Resource
    Electronic Resource
    A Double Multilayer Monochromator at an ESRF Undulator for Microbeam Experiments (1995)
    Chester : International Union of Crystallography (IUCr)
    Journal of synchrotron radiation 2 (1995), S. 124-131 
    Details
    ISSN: 1600-5775
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: A water-cooled double W/Si-multilayer monochromator has been operated at an ESRF low-β undulator beam. For a fixed distance of the two multilayers the first-order Bragg reflection was at 8̃ keV. The peak power density of the beam at the exit of the multilayers was 1̃ W mm−2 and the flux density of the first order after a 10 μm collimator was 4 × 105 photons s−1 μm−2 mA−1. The performance of the beam in microbeam diffraction has been tested on a 20 μm W wire. The observed pseudo-Laue pattern is discussed with respect to the multilayer spectrum.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0909049595001592
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