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  • 1
    Electronic Resource
    Electronic Resource
    Characterization of radiation from a figure-8 undulator by a gas-scattering method (2000)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 88 (2000), S. 2101-2107 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The absolute flux, polarization properties, and spatial dependence of the intensity of figure-8-undulator radiation were measured by a gas-scattering method. Absolute-flux measurements were in good agreement with calculated values and the angular divergence measured at 6.6 keV was also close to expected value. Polarization measurements showed oscillations of the degree of linear polarization which varied with photon energy, indicating that both horizontal and vertical polarizations were included. In addition, the polarization plane was found to rotate when the vertical observation angle was changed. These polarization characteristics are not observed in other conventional-undulator radiation and thus unique to figure-8-undulator radiation. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1305840
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  • 2
    Electronic Resource
    Electronic Resource
    Conceptual design of SPring-8 contract beamline for structural biology : Proceedings of the 5th international conference on synchrotron radiation instrumentation (1995)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 66 (1995), S. 1833-1835 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: At SPring-8, a contract beamline has been designed and developed for structural biology by the Institute of Physical and Chemical Research (RIKEN). In structural biology, three-dimensional knowledge of biological macromolecules is indispensable for understanding biological functions: x-ray crystallography, small-angle x-ray scattering (SAXS), and x-ray-absorption fine-structure are the typical techniques. The beamline contains two experimental stations, protein crystallography and SAXS. Both experiments can be carried out simultaneously, with dichromatic synchrotron radiation emitted from two undulators in serial arrangement. The branched beams are generated by a transparent diamond crystal. The beam for the protein crystallography station is provided by the "trichromator'' to optimize for MAD (multiwavelength anomalous diffraction) experiments. The main feature of this concept is to minimize systematic errors in anomalous dispersion measurements for MAD experiments. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1145797
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  • 3
    Electronic Resource
    Electronic Resource
    Effective initial sorting of undulator magnets (2000)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 71 (2000), S. 3010-3015 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A new method to optimize undulator magnet arrangement is considered. Field-integral values of magnet blocks instead of magnetic flux distributions are used to determine the magnet arrangement for the purpose of not only reducing integrated multipole but also improving spectral intensity. A system composed of a fast-rotating coil and a lock-in amplifier has been constructed for fast and accurate measurement of field integrals. A ten-period test undulator has been assembled with the best and the worst arrangements determined by the optimization method. Undulator performances such as integrated multipoles, orbit deviations, and phase errors have been measured at various gap values, which showed a good agreement with expectations in both cases. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1304878
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  • 4
    Electronic Resource
    Electronic Resource
    Construction and performance of a figure-8 undulator (1999)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 70 (1999), S. 4153-4160 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: The figure-8 undulator is a novel insertion device adopted as a light source at the soft x-ray photochemistry beamline of the Super Photon ring-8GeV. It was designed to produce linearly polarized soft x rays between 100 and 5000 eV with low on-axis power density. Magnetic fields of the constructed device were measured with compensation for the planar Hall effect using two different methods. After magnetic-field corrections, it was found that the first-harmonic intensity and the on-axis power density calculated using the measured fields were almost the same as ideal ones. After installation in the storage ring, a power-distribution pattern was observed by a fluorescent screen and it was found that the shape corresponded to expectation. The quantity of fluctuation of the photon-beam axis was estimated by measuring spectra at various observation angles and it was found to be small compared to the photon-beam size. In addition, it was also found that the measured spectrum at the gap of 77 mm agreed well with the calculated one. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1150044
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