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  • 1985-1989  (3)
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Material
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Year
  • 1
    Electronic Resource
    Electronic Resource
    Surface temperature and distortion of optical elements exposed to high power synchrotron radiation beams (invited) : International conference on synchrotron radiation instrumentation (1989)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 60 (1989), S. 1474-1478 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: Mirrors made of various materials have been investigated under surface power densities of approximately 1–2 W/mm2 emitted by a powerful hybrid wiggler installed in the 5.3-GeV DORIS storage ring. Thermal inhomogeneities and deformations at surfaces with a height resolution of 50 nm have been determined quantitatively. The only material withstanding these power levels without a significant deformation is SiC. Conventional cooling geometries are found to be useless for a reduction of the surface distortion.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1140966
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Performance of multilayers in intense synchrotron x-ray beams : International conference on synchrotron radiation instrumentation (1989)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 60 (1989), S. 1999-2002 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: The use of multilayer reflectors under intense synchroton x-ray beams requires to develop a new generation of multilayered materials that can withstand a high-power load in excess of 100 W/mm2. Multilayers with the high-Z layer consisting either of a pure element or of compounds such as carbides, nitrides, or silicides have been produced. Because the fabrication conditions are not yet optimized, thin films with satisfactory layer were not obtained leading to poor reflectivities. Such multilayers have been both thermally annealed in a furnace and exposed to a synchrotron beam with a power density of about 1 W/mm2. The resulting damage ranges from the total destruction of the layering to a reduction of the reflectivity by typically 40%–60%. In some cases an only 1%–15% loss in reflectivity has been observed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1140859
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    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Nondiagonal momentum density of Si by coherent inelastic X-ray scattering (1986)
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 42 (1986), S. 86-98 
    Details
    ISSN: 1600-5724
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: When the coherent superimposition of two (nearly) plane waves is used as the initial photon state of an inelastic X-ray scattering experiment on solids (coherent Compton scattering), information can be obtained about the projection of nondiagonal elements of the one-particle density matrix in momentum space on the scattering vector q, provided the requirements of the impulse approximation are fulfilled. The double differential scattering cross section for this new scattering phenomenon is derived and then subjected to impulse approximation. It is further demonstrated that the standing wave pattern, which on passing the Bragg reflection range is sweeping the atomic sites, yields an appropriate approach to the desired initial photon state for coherent Compton scattering. Experimental coherent Compton spectra from 111 and 220 Bragg reflections are used to extract the corresponding projections of nondiagonal elements of the density matrix. Possible experimental improvements are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0108767386099828
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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