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  • 1
    Electronic Resource
    Electronic Resource
    Beam position stabilization at the Photon Factory (invited) : International conference on synchrotron radiation instrumentation (1989)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 60 (1989), S. 1507-1512 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: To obtain position-stabilized photon beams from the Photon Factory storage ring, our efforts were concentrated on two directions, one to minimize any disturbances causing the stored beam to move, and the other to suppress undesired beam motion by using feedback systems. This paper concerns one of the most disturbing cases, the diurnal beam position drift. The drift motion was suppressed with a global orbit feedback system, so that photon beam position was kept stable at all the beamlines. At the same time, some disturbances were reduced by investigating the cause and the mechanism of beam motion. The fact that the beam drift motion was closely correlated to the outdoor temperature variations led us to make a model simulation by taking account of the meteorological conditions around the building. It was proved that the building distortion due to the external thermal stress resulted in the diurnal beam motion. To minimize such distortion, it is suggested that one should insulate the building on the rooftop rather than underneath it as is usually done.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1140971
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Construction and operation of the multipole wiggler, MPW#16, at the Photon Factory : International conference on synchrotron radiation instrumentation (1989)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 60 (1989), S. 1855-1858 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A high-field multipole wiggler (MPW#16), which was composed of hybrid-configured permanent magnets, was completed and installed in the 2.5-GeV Photon Factory (PF) storage ring as the third insertion device. Compared to the synchrotron radiation from the bending magnet on the PF ring, the radiation from the MPW#16 has two orders higher brilliance in the x-ray region and three orders higher in the vacuum ultraviolet region. The stable operation of the storage ring coupled with the MPW#16 has been confirmed through various machine studies.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1140922
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Apparent displacement of the synchrotron radiation beam observed on beamline 4 of the Photon Factory storage ring : INTERNATIONAL CONFERENCE ON SYNCHROTRON RADIATION INSTRUMENTATION (1989)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 60 (1989), S. 1957-1960 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: The photon beam radiating from the position-stabilized storage ring tended to show large vertical drift at some beamlines. It had earlier been pointed that the beam drift might be due to the local floor displacement which was caused by the thermal distortion of the storage ring building. An estimate of the floor displacement was made by using a simulation model which takes into account the thermal stress due to the sunbeam heating of the buildings, and it seemed to give an explanation for the amount of photon-beam displacement. This raised a question whether the local floor movement is fully responsible for the apparent displacement of the photon beam. Detailed study was primarily carried out for beamline 4. First, the level of the beamline was surveyed and found to be small compared with the amount of beam displacement actually observed. Second, when beam displacement was measured with respect to two independent frames of reference located at the upstream and downstream ends of the beamline, no difference was found between the two. Both the level survey and the displacement measurement led us to conclude that the large photon-beam drift was produced not by the local floor movement, but by the beam itself.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1140899
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  • 4
    Electronic Resource
    Electronic Resource
    A new VUV beamline BL-19 for undulator radiation at the Photon Factory : INTERNATIONAL CONFERENCE ON SYNCHROTRON RADIATION INSTRUMENTATION (1989)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 60 (1989), S. 1893-1896 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A new VUV beamline at the Photon Factory ring that is designed to accept radiation emitted from an undulator is described. The characteristics of the undulator and all parts of the beamline; a front end, a mirror system, and two monochromators, are described in detail. The characteristics of optical elements in the beamline are also shown.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1140882
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Metabolism of gibberellins in a cell-free system from immature seeds of Phaseolus vulgaris L. (1986)
    Springer
    Planta 168 (1986), S. 190-199 
    Details
    ISSN: 1432-2048
    Keywords: Gibberellin biosynthesis ; Phaseolus (gibberellins) ; Seed (gibberellins)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The biosynthetic steps from gibberellin A12-aldehyde (GA12-aldehyde) to C19-GAs were studied by means of a cell-free system from the embryos of immature Phaseolus vulgaris seeds. Stable-isotope-labeled GAs were used as substrates and the products were identified by gas chromatography-mass spectrometry. Gibberellin A12-aldehyde was converted to GA4 via non-hydroxylated intermediates and to GA1 via 13-hydroxylated intermediates. 13-Hydroxylation took place at the beginning of the pathway by the conversion of GA12-aldehyde to GA53-aldehyde. The conversion of GA20 to GA5 and GA6 was also shown but no 2β-hydroxylating activity was found. Endogenous GAs from embryos and testas of 17-dold seeds were re-examined by gas chromatography-selected ion monitoring using stable-isotopelabeled GAs as internal standards. Gibberellins A9, A12, A15, A19, A23, A24, and A53 were identified for the first time in P. vulgaris, in addition to GA1, GA4, GA5, GA6, GA8, GA17, GA20, GA29, GA37, GA38 and GA44, which were previously known to occur in this species. The levels of all GAs, except the 2β-hydroxylated ones, were greater in the embryos than in the testas. Conversely, the contents of GA8 and GA29, both 2β-hydroxylated, were much higher in the testas than in the embryos.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00402963
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    The loss of carbon-20 in C19-gibberellin biosynthesis in a cell-free system from Pisum sativum L. (1986)
    Springer
    Planta 169 (1986), S. 524-528 
    Details
    ISSN: 1432-2048
    Keywords: Gibberellin (C20→C19 conversion) ; Pisum (gibberellin synthesis)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The fate of the carbon-20 atom in gibberellin (GA) biosynthesis was studied in a cell-free system from Pisum sativum. This carbon atom is lost at the aldehyde stage of oxidation when C20-GAs are converted to C19-GAs. Gibberellin A12 labeled with 14C at C-20 was prepared from [3′-14C]mevalonic acid with a cell-free system from Cucurbita maxima and incubated with the pea system. Analysis of the gas and aqueous phases showed that 14CO2 was formed at the same rate and in nearly equivalent amounts as 14C-labeled C19-GAs whereas [14C]formic acid and [14C]formaldehyde were not detectable. The possibility that C-20 had been lost as formic acid which had then been converted to CO2 was investigated by control incubations with [14C]formic acid. The rate of release of 14CO2 from [14C]formic acid was only one fiftieth of the rate of 14CO2 release from [14C]GA12 as the substrate. We conclude that in the formation of C19-GAs from C20-GAs, the C-20 is removed directly as CO2.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00392102
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