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Kamiya, Junichiro; Ogiwara, Norio; Nishikawa, Masaaki; Hikichi, Yusuke; Yanagibashi, Toru; Suganuma, Kazuaki
Journal of the Vacuum Society of Japan, 55(4), p.156 - 159, 2012/04
It is usually difficult to reduce outgassing of a large structure inside a vacuum chamber by baking the whole chamber, which causes the large extension of the chamber and needs a lot of heater power. The solution is to rise the temperature of structure object without heating the vacuum chamber. This means to install heat source inside the chamber and increase the heat quantity to the object by inserting the heat shield between the object and the chamber. In the particle accelerator field, there are a lot of such requirements for reducing outgassing of structures inside vacuum chambers. One example is a kicker magnet, which is installed in a vacuum chamber and consists mainly of ferrite cores and aluminum electric plates. We applied the above method to the outgassing reduction of the kicker. In this article, we show outline of this in-situ bake-out method, the effects of the heat shield on the heat quantity and the result of the outgassing reduction.
Kato, Shinichi*; Kamiya, Junichiro; Yamamoto, Kazami; Yoshimoto, Masahiro; Kinsho, Michikazu
Journal of the Vacuum Society of Japan, 55(4), p.160 - 163, 2012/04
It is necessary to shield particles which are in vacuum chamber from the unexpected magnetic field to keep stable operation for accelerator. In this case, it's most efficient that the vacuum chamber has magnetic shield effect. For such a reason, we have developed the vacuum chamber with magnetic shield effect using the material of SUS430 which is magnetic material. The requirements for this chamber are not only magnetic shield effect but also low outgassing rate to use for high intensity accelerator. We measured outgassing rate of the SUS430 using small samples with differential pressure flow method, it was cleared that the SUS430 is available for vacuum chamber.
Ogiwara, Norio; Kamiya, Junichiro
Journal of the Vacuum Society of Japan, 55(4), p.152 - 155, 2012/04
Kamiya, Junichiro; Ogiwara, Norio; Hayashi, Naoki; Hotchi, Hideaki; Yoshimoto, Masahiro; Kinsho, Michikazu
Journal of the Vacuum Society of Japan, 55(3), p.100 - 103, 2012/03
It is necessary to reduce the beam loss in the high power beam accelerators. One of the reasons of the beam loss is the leakage magnetic field from the beam line magnet, which distorts the beam orbit and makes the beam hit the wall of the beam pipe. The most effective way to shield such leakage field is to cover the beam by the magnetic materials at the nearest space. We decided to apply this method to the vacuum chambers of the straight section of the J-PARC 3 GeV synchrotron, where the effect of the leakage magnetic field to the beam orbit is evident. However, there is few proven evidence of the vacuum chambers of the magnetic material. Therefore we clarify the problems in producing vacuum chambers and bellows, which satisfy the magnetic and vacuum performance. In this article, we deliver the over view of the magnetic shielding project and our approaches to the problems in producing the vacuum chambers of new material.
Nakamura, Kazuyuki; Ida, Mizuho; Kanemura, Takuji; Kondo, Hiroo; Niitsuma, Shigeto; Hirakawa, Yasushi; Furukawa, Tomohiro; Watanabe, Kazuyoshi; Wakai, Eiichi
no journal, ,
EVEDA Li test loop, which is one of the major conponents for the development of the IFMIF, has been fabricated in Oarai Research Center. A detail of the fabrication and the first operation of the vacuum system, which is compatible with the high temperature and much liquid Li(300 
C, 2.5 ton), will be presented.
Hashinokuchi, Michihiro*; Okada, Michio*; Yoshigoe, Akitaka; Teraoka, Yuden
no journal, ,
no abstracts in English
Tode, Mayumi; Harries, J.; Teraoka, Yuden; Yoshigoe, Akitaka
no journal, ,
no abstracts in English
