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Fukaya, Yuki; Entani, Shiro*; Sakai, Seiji*; Mochizuki, Izumi*; Hyodo, Toshio*; Shamoto, Shinichi
no journal, ,
no abstracts in English
Kinsho, Michikazu; Kamiya, Junichiro; Abe, Kazuhiko*; Nakamura, Tomaru*
no journal, ,
Alumina ceramics vacuum Chamber which is used for the 3 GeV rapid-cycling synchrotron (RCS) in J-PARC is composed of alumina duct, Ti flanges and Ti sleeves. Before brazing the alumina duct and the Ti sleeves, the Ti sleeves were treated with Nitric acid-Hydrofluoric acid. The purpose of this study is to clear the effect of this treatment for titanium material. It was cleared that the roughness of the titanium material after the Nitric acid-Hydrofluoric acid treatment becomes big for SEM observation. It was also measured that the thickness of oxide film on surface of the titanium material was 12.7 nm before treatment and 6.0 nm after treatment.
Yano, Masahiro; Suzuki, Shota; Uozumi, Yuki; Asaoka, Hidehito
no journal, ,
no abstracts in English
2 surface by low temperature desorption of oxide layerSuzuki, Shota; Yano, Masahiro; Uozumi, Yuki; Asaoka, Hidehito; Yamaguchi, Kenji*
no journal, ,
no abstracts in English
Kamiya, Junichiro; Yanagihashi, Toru; Kinsho, Michikazu; Yamazaki, Yoshio; Yamamoto, Kazami; Yoshimoto, Masahiro
no journal, ,
Multi-turn H
charge exchange injection is a popular injection method at many high power beam synchrotrons in the world. Two electrons of H beam from the linear accelerator is stripped to the protons, by through a charge stripper at the injection point of the synchrotron ring. Matching between injected and circulated beams at the injection point is easily obtained. This method is also applied to the J-PARC 3 GeV synchrotron, where thin carbon foil with about 300 ug/cm
thickness is installed as the charge stripper. The foil is heated above 1000 K by the energy deposition of the 400 MeV injected proton beam. Therefore it is concerned that large amount of ourgassing would be released from the foil. In this presentation, we report the measured outgassing characteristics of the charge stripper foil at higher temperature. We also report the foresight of the outgassing reduction method derived from such measurement results.
Ogiwara, Norio; Hikichi, Yusuke*; Kamiya, Junichiro; Kinsho, Michikazu
no journal, ,
H
on Cu(111) using supersonic CH molecular beamMakino, Takamasa*; Tsuda, Yasutaka*; Tsukada, Chie; Yoshigoe, Akitaka; Okada, Michio*
no journal, ,
Studies on the interaction between ethylene molecule and metal surfaces are the important subject to understand catalyitic reactions such as dehydrogenation. To clarify dissociation adsorption processes of ethylene at metal surfaces, the surface analysis after exposure of ethylene to Cu(111) surface was conducted by using synchrotron radiation XPS. We found the growth of peak intensities and the peak shifted to higher binding energy side when ethylene beams with the kinetic energy of 2 eV were irradiated at the surface temperature of 300 K. The adsorption states and surface temperature dependece of reactions will be discussed.