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Volume 43, Issue 7
Displaying 1-8 of 8 articles from this issue
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Tetsuji ODA2000 Volume 43 Issue 7 Pages 707-716
Published: July 20, 2000
Released on J-STAGE: October 20, 2009
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Takayoshi SAITO2000 Volume 43 Issue 7 Pages 717-723
Published: July 20, 2000
Released on J-STAGE: October 20, 2009
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Hiroyasu KOJIMA2000 Volume 43 Issue 7 Pages 724-727
Published: July 20, 2000
Released on J-STAGE: October 20, 2009
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Toshitaka KUBO, Hisakazu NOZOYE2000 Volume 43 Issue 7 Pages 728-733
Published: July 20, 2000
Released on J-STAGE: October 20, 2009
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Yuki ISHIMOTO, Yousuke NAKASHIMA, Akio SAGARA, Takeyuki MORIWAKI, Yuki ...2000 Volume 43 Issue 7 Pages 734-740
Published: July 20, 2000
Released on J-STAGE: October 20, 2009
JOURNAL FREE ACCESSCarbon sheet pump (CSP) is developed for reduction of hydrogen recycling in fusion plasma devices. A small scale test module has been made for the GAMMA 10 tandem mirror and exposed to charge exchange fast neutrals from hotion plasmas (5 keV). Pressure difference between the case with exposure of CSP to fast neutrals (CSP-on) and another case without exposure (CSP-off) is observed reproductively, in which clearly shows the pumping effect of CSP. The life time of CSP is estimated to be 2000 sec, or 10000 shots in GAMMA 10. Pumping efficiency of CSP estimated from the time evolution of total pressure measured in the test module is about 0.50.8. Thermal desorption experiments show that 2060% of trapped hydrogen is released by direct joule heating up to 800°C. Partial pressure of impurities during CSP-on and CSP-off are measured. No change of the impurity pressure was observed in the hot-ion plasmas. It is confirmed that CSP is applicable to actual plasma devices.View full abstractDownload PDF (811K) -
Yukio INOKUTI2000 Volume 43 Issue 7 Pages 741-744
Published: July 20, 2000
Released on J-STAGE: October 20, 2009
JOURNAL FREE ACCESSIn order to clarify the crack morphology in 180° bend-forming of the TiN film deposited on (011) [100] single crystals of silicon steel, TiN coating by the hollow cathode discharge (HCD) method was done on a polished (011) [100] single crystal sample. The TiN-coated samples were 180° bend-formed and observed by the scanning electron microscope.
In the position (a) just above 180° bend-forming, TiN film showed the straight crack at the interval of 2-4 μm parallel to the direction of [121] TiN. In contrast, in the position (b) near the transition zone from bend-forming to tensioning, TiN film showed an elliptical morphology 23-30 μm long and 9-12 μm wide.
The point of origin of a small TiN crack can be seen near the center of the ellipse, and the straight crack in the TiN film will propagate from this origin.
It should be noted that the TiN crack morphology differed remarkably depending on the positions of bend-forming.View full abstractDownload PDF (768K) -
Takahiro KONDO, Shinjiro YAGYU, Tomomi HIRAOKA, Toshiyuki IKEUCHI, Shi ...2000 Volume 43 Issue 7 Pages 745-749
Published: July 20, 2000
Released on J-STAGE: October 20, 2009
JOURNAL FREE ACCESSAt various surface temperatures (400, 600 and 800 K), after irradiation of a hyperthermal CH4 molecular beam as much as 25000 L, the work function of the Pt (111) surface was measured by a Kelvin probe to find a relationship between the work function and the reaction products.
It was found by HAS (Helium Atom Scattering), AES/LEED and work function measurements that a monolayer of the reaction products (ethylidyne, hydrocarbon and graphite) form only at the beam irradiated area. The species and the amount of these products depend on the surface temperature; a large amount of graphite at 800 K, a medium amount of hydrocarbon at 600 K and a small amount of ethylidyne at 400 K. The work function of the Pt (111) surface covered by graphite decreases as much as 0.8 eV from that of a clean Pt (111) surface. The work function of the Pt (111) surface covered by ethylidyne is nearly the same as that of hydrocarbon covered surface in spite of their difference in surface coverage. This seems to be attributed to the formation of the dipole caused by the charge transfer from, ethylidyne to Pt (111) surface.View full abstractDownload PDF (640K) -
Kota OZEKI, Ryo OZAWA, Yutaka SUZUKI, Naoko MORI, Tomio YAGUCHI, Junji ...2000 Volume 43 Issue 7 Pages 750-753
Published: July 20, 2000
Released on J-STAGE: October 20, 2009
JOURNAL FREE ACCESSBoth topographical and corresponding surface potential images of an Fe-42Ni alloy sample surface have simultaneously been measured by SMM in a microscopical dimension. The Fe-42Ni sample was heat-treated in air in the range between 100°C and 400°C. The surface potential histogram obtained from each potential image pixels presents quantitative distribution of the surface potential, which is the difference in local work function of the sample increases with increase in oxidation temperature. A broad work function distribution resulting from various oxidation states was obtained from the sample oxidized at 200°C.View full abstractDownload PDF (795K)
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