Shinku
Online ISSN : 1880-9413
Print ISSN : 0559-8516
ISSN-L : 0559-8516
Volume 28, Issue 12
Displaying 1-4 of 4 articles from this issue
  • Hajime ISHIMARU, Takashi MOMOSE, Katsuya NARUSHIMA, Hajime MIZUNO, Ken ...
    1985 Volume 28 Issue 12 Pages 867-890
    Published: December 20, 1985
    Released on J-STAGE: September 29, 2009
    JOURNAL FREE ACCESS
    The first truly all-aluminum alloy ultrahigh vacuum system for an electron-positron accumulation ring is described. The ultimate pressure, the order of 10-8 Pa, was obtained without any baking or discharge cleaning. For a time integrated beam current of 15 A.h, the pressure rise due to synchrotron radiation was 2×10-8 Pa/mA and the maximun beam life time was about 2hours for 10mA. We have no problem essentially in the all-aluminum vacuum system. The present system satisfied conditions such as high performance, high reliability, impedance matching, simplicity, low wasted space between magnets, small size, low residual radioactivity and low cost.
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  • Masatoshi OHKOSHI, Shinji ODA, Shigeo HONDA, Tetsuzo KUSUDA
    1985 Volume 28 Issue 12 Pages 891-897
    Published: December 20, 1985
    Released on J-STAGE: September 29, 2009
    JOURNAL FREE ACCESS
    Crystal growth is investigated in CoCr films sputtered with applying negative substrate bias voltage VB. Saturation magnetization and perpendicular magnetic anisotropy decrease with increasing VB which comes from more uniform mixing of Co and Cr. Crystal growth is enhanced by applying about -75V bias accompanying an increment of c-axis orientation. Different shape in magnetic hysteresis loop between zero bias films in which Cr segregates around columns and -75 V bias films including grownup crystals suggests different mode in the magnetization process. Magnetic domain structure is observed by Bitter technique in the two types of CoCr films in which magnetization process is thought to be a rotational mode and a wall displacement mode. However, Bitter pattern is the same and composed of dotted contrast in the both films suggesting that the magnetization localizes in the columns.
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  • Masahiro HIRATA, Hideaki ISOGAI, Kiyohide KOKUBUN, Masatoshi ONO
    1985 Volume 28 Issue 12 Pages 898-903
    Published: December 20, 1985
    Released on J-STAGE: September 29, 2009
    JOURNAL FREE ACCESS
    The influence of operational conditions of a spinning rotor gauge on its accuracy was studied in order to clarify the performance of the gauge as a transfer standard gauge or a secondary standard gauge. The lower limit of measuring pressure of the gauge was affected by its offset pressure resulting from setting angle of the sensor, external vibration and thermal effects. One of the thermal effects on the offset pressure, which was evident just after starting of operation, was explained from the temperature change of the sensor head. The gauge sensitivity in high pressure region was measured by using a diaphragm gauge as a reference gauge. It was confirmed that the accuracy of the spinning rotor gauge was kept 1% between 10-3 to 10 Pa for long term.
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  • Yoichiro HORI, Nobuaki NODA, Kenya AKAISHI, Akira MIYAHARA
    1985 Volume 28 Issue 12 Pages 904-909
    Published: December 20, 1985
    Released on J-STAGE: September 29, 2009
    JOURNAL FREE ACCESS
    A surface analysis station was designed and constructed to carry out a TEXTOR-Japan collaboration research plan on plasma wall interaction in TEXTOR tokamak. A large part of the vacuum vessel of the station was made of A6063 aluminum alloy and the vacuum system consists of a sputter ion pump with titanium getter, a turbomolecular pump and an oil rotary pump. Ultimate vacuum pressure less than 3×10-7 Pa was achieved routinely after baked out at maximum temperature of 120°C for 15 hrs. For in-situ AES observation of sample surfaces, a CMA and an ion-etching gun are installed in the station. A total of 12 samples can be installed and each sample can be transferred to analysis position and plasma boundary by a manipulator and a transporter. The station was applied to investigate the wall surface due to in-situ carbon coating. In this paper an actual performance of the station is described, and some experimental data on AES observation are introduced. The problems necessary for technical improvement are pointed out and discussed.
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