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  • 1
    Electronic Resource
    Electronic Resource
    Adaptive Silicon Monochromators for High-Power Insertion Devices. Tests at CHESS, ESRF and HASYLAB (1995)
    Chester : International Union of Crystallography (IUCr)
    Journal of synchrotron radiation 2 (1995), S. 1-5 
    Details
    ISSN: 1600-5775
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: X-ray wigglers which produce tens of kilowatts of photon power within the white beam will soon become available at third-generation sources of synchrotron radiation. Insertion devices that produce several kilowatts already exist and we have used those at CHESS, ESRF and HASYLAB to test adaptive 111 silicon water-jet-cooled monochromators at up to 2 kW total incident beam power. This development from earlier work at the Brookhaven National Synchrotron Light Source (NSLS) uses the pressure in the water coolant to provide active compensation of the strain field in the thermal footprint, nulling its effect to within residual variations in Bragg angle of only a few arc s. The design is robust, vacuum compatible and uses no moving mechanical parts.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S090904959400957X
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  • 2
    Electronic Resource
    Electronic Resource
    Neutron spin-echo investigations on the dynamics of polymers (1988)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 21 (1988), S. 715-728 
    Details
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: Neutron spin-echo spectroscopy allows the observation of long-range internal relaxation mechanisms of macromolecules simultaneously in space and time. Thereby, it facilitates a microscopic study of molecular models applied for the explanation of macroscopic viscoelastic properties of polymer materials. After a short outline of the method, this paper discusses experimental results on chain relaxation in dilute solution of linear as well as of branched polymer chains choosing the star polymer as a prototype. Thereafter, chain motion in dense polymer systems under varying topological constraints is addressed. Results on concentrated solutions, melts and chains trapped in networks with different mesh sizes are presented and compared with theoretical models. Finally aspects of the dynamics of polymer networks are discussed and spin-echo results on the motion of labelled cross links are presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S002188988800487X
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