O Shinji

Kuraray Co. Ltd, Edo, Tōkyō, Japan

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Publications (6)6.58 Total impact

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    ABSTRACT: We measured the number of photoelectrons released from the photocathode of a newly available hybrid photomultiplier tube (HPMT) by photons from scintillating fibres. About 1600 individual 60 mum diameter fibres are contained in fused square bundles of 2.5 mm edges. The number of photoelectrons per mm fibre path changes from 10.6 at zero to 1 at 2 m bundle length. The potential difference between the HPMT photocathode and its electron detecting silicon diode amounted to 13 kV.
    Nuclear Instruments and Methods in Physics Research Section A Accelerators Spectrometers Detectors and Associated Equipment 06/1994; 345(2). · 1.32 Impact Factor
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    ABSTRACT: We measured the attenuation losses and the corresponding number of photoelectrons in small diameter fibre bundles. Accordingly, two experimental setups have been developed for this purpose. The improvements in light yield of the last two years, due to better fibre production and to optimization of materials, concentrations and geometrical characteristics, are shown and discussed in detail. For 60 mum diameter fibre bundle, they amount to a factor 2 at the near end and to a factor 8 at 2 m distance from the light detecting photocathode.
    Nuclear Instruments and Methods in Physics Research Section A Accelerators Spectrometers Detectors and Associated Equipment 07/1993; · 1.32 Impact Factor
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    ABSTRACT: Fused bundles of 60 mum diameter scintillating fibres with square cross sections of 2.5 mm edge length, were illuminated through 2 m length and their exit faces magnified and then photographed with a highly resolving CCD-camera. Subsequently, rows of individual fibres were selected with an appropriate slit or grid in front of the entrance face. The pictures taken, stored in a MacIntosh computer, were processed to determine the coherency, the intrinsic optical precision and the resolution of these bundles without distortions by optoelectronic readout systems: the precision (sigma) varied from 18.4 to 22 mum and the resolution from 42 to 55 mum, depending on the angular deviation from parallel slit orientation.
    Nuclear Instruments and Methods in Physics Research Section A Accelerators Spectrometers Detectors and Associated Equipment 02/1993; · 1.32 Impact Factor
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    ABSTRACT: Elastic pp (or ) scattering at microradian angles provides a measurement of the total pp (or ) cross sectio elastic scattering cross section with t (the square of the momentum transfer) and the ratio of real to imaginary scattering amplitudes, as well as an absolute luminosity calibration. A detector is proposed which can measure elastic scattering and small angle processes which are usually missed by a typical 4π detector. The detector consists of a bundle of scintillating fibers. Images from these fibers are transported via glass fiber optics and intensified with two proximity focused image intensifiers. Images are then reduced via an image taper and read out with a charge coupled device (CCD).
    Nuclear Instruments and Methods in Physics Research Section A Accelerators Spectrometers Detectors and Associated Equipment 12/1992; 323(s 1–2):419–423. · 1.32 Impact Factor
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    ABSTRACT: The reflection losses, which occur during light guidance through polystyrene fibres of 30 mum diameter at their core-cladding interface, have been determined in order to evaluate their contribution to the total light attenuation of scintillating fibres. For the deviation (1 - q) of the reflection coefficient q from unity we obtained: 6 × 10-5 (at 458 nm), 5.36 × 10-5 (at 514 nm) and 5 × 10-5 (at 633 nm). In addition, we found light losses in the polystyrene core, which we attribute to Rayleigh scattering on submicron density variations in polystyrene. The resulting scattering lengths are: 3.6 m (at 420 nm) and 9.5 m (at 530 nm).
    Nuclear Instruments and Methods in Physics Research Section A Accelerators Spectrometers Detectors and Associated Equipment 09/1991; · 1.32 Impact Factor
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