Shinku
Online ISSN : 1880-9413
Print ISSN : 0559-8516
ISSN-L : 0559-8516
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Volume 25, Issue 7
Displaying 1-4 of 4 articles from this issue
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  • Scattering of Atoms and Molecules from Solid Surfaces
    Hiromu ASADA, Yuichi OHNO
    1982 Volume 25 Issue 7 Pages 485-499
    Published: July 20, 1982
    Released on J-STAGE: September 29, 2009
    DOIhttps://doi.org/10.3131/jvsj.25.485
    JOURNAL FREE ACCESS
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  • Tensile Fracture of Evaporated Au Films (III)
    Tetsuya HOSAKA
    1982 Volume 25 Issue 7 Pages 500-505
    Published: July 20, 1982
    Released on J-STAGE: September 29, 2009
    DOIhttps://doi.org/10.3131/jvsj.25.500
    JOURNAL FREE ACCESS
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    The propagation of the fracture under dynamic tensile strain of vacuum-evaporated gold films was observed directly in a scanning electron microscope and a transmission electron microscope. The dynamic testing for this observation was accomplished by mounting the film on rubber substrate. Gold films from 470 to 720Å in thickness used in this study were heated at different temperatures ranging from 100 to 700 °C. The total strain of the film was usually of the order of 2.4 to 5.1% at fracture. It was shown that localized plastic deformation dispersed in a region of the tip of the fracture and the film edges exhibited a ragged type fracture. The fracture strain ratio (εd/εs) of dynamic and static fracture gold films increased with increasing thickness.
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  • Modulating Ion Current Pressure Gauge
    Fumio WATANABE, Shigenori HIRAMATSU, Hajime ISHIMARU
    1982 Volume 25 Issue 7 Pages 506-518
    Published: July 20, 1982
    Released on J-STAGE: September 29, 2009
    DOIhttps://doi.org/10.3131/jvsj.25.506
    JOURNAL FREE ACCESS
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    The pressure in a beam pipe of the 12 GeV proton synchrotron of National Laboratory for High Energy Physics has been measured with a high accuracy by the new developed modulating ion current gauge (MIC-G). The output signal of the gauge head was sent to the sub-control room of the synchrotron by a 120 m long cable and the measurement was carried out when a proton beam was accelerated in the synchrotron. The gauge head has a modulator electrode between an ionization region and an ion collector to modulate the ion current. The modulated signal is sent to an amplifier with a double shielded cable and then it is amplified and detected with a phase sensitive detector (PSD). This method can reduce externally induced noise and the influences of desorbed ions by a electron impact from an anode electrode and of X-ray photoelectric currents from an ion collector can be also avoided.
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  • ECR Discharge Cleaning in the JIPP T-II Torus Device
    Yuichi SAKAMOTO, Yukio ISHIBE, Shigeyuki ISHII, Kiyohiko OKAZAKI, Hito ...
    1982 Volume 25 Issue 7 Pages 519-526
    Published: July 20, 1982
    Released on J-STAGE: September 29, 2009
    DOIhttps://doi.org/10.3131/jvsj.25.519
    JOURNAL FREE ACCESS
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    By the use of the JIPP T-II torus device (IPP Nagoya), an experiment on ECR discharge cleaning was carried out. The aim was focused to finding the effect of the cleaning on tokamak discharges. To characterize the tokamak discharge property, mean plasma resistivity, intensity of an oxygen ion spectral line and mean electron density without gas puffing were measured. The first cleaning operation for 5 hours drastically improved the purity of the tokamak discharge plasma. The succeeding 75 hours' cleaning gave the wall surface condition corresponding to Zeff=1.0.
    The cleaning plasma had the electron temperature of 5 eV and the density of about 1×1010cm-3 with a hy drogen pressure of 2.9×10-2 Pa and a microwave power of 800 W.
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