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Sukenobu, Satoru*; Masaki, Kentaro*; Ohkama, Kazuma*; Ogiwara, Norio
Journal of the Vacuum Society of Japan, 56(4), p.142 - 145, 2013/04
Ogiwara, Norio; Suganuma, Kazuaki; Hikichi, Yusuke; Kamiya, Junichiro; Kinsho, Michikazu; Sukenobu, Satoru*
Journal of Physics; Conference Series, 100, p.092024_1 - 092024_5, 2008/00
Times Cited Count：4 Percentile：81.68(Nanoscience & Nanotechnology)Pure Ti is adopted as a material for ducts and bellows at the 3 GeV-RCS in J-PARC project, because of its small residual radioactivity. In the particle accelerator, the H
outgassing due to ion impact is often dominant gas release. As the reduction of hydrogen content probably leads to the suppression of ion induced desorption, we intend to reduce the hydrogen content in the Ti by in-situ vacuum baking. First of all, thermal desorption behavior and the change in hydrogen content have been investigated. The vacuum firing over than 550
C is effective to reduce the hydrogen content in the Ti. The mechanical properties have been also monitored because a grain growth leads to the decrease of mechanical strength. Even after the treatment at 750C for 12 h the decreases in tensile and yield strength are so small (
10%) that we have no anxiety about the reduction of mechanical strength. Based upon this study, the vacuum firing has been applied for the RCS machine.
Suganuma, Kazuaki; Hikichi, Yusuke; Ogiwara, Norio; Sukenobu, Satoru*
Proceedings of 5th Annual Meeting of Particle Accelerator Society of Japan and 33rd Linear Accelerator Meeting in Japan (CD-ROM), p.346 - 348, 2008/00
Pure Ti is adopted as a material for ducts and bellows at the proton accelerator 3 GeV-RCS in J-PARC project, because of its small residual radioactivity. We intended to apply vacuum firing to reduce the hydrogen content in the Ti. The firing at temperatures higher than 550C was effective in reducing the hydrogen content in the Ti. At the same time, we have measured the mechanical properties because grain growth leads to decrease in mechanical strength. Even after treatment at 750C for 8 hr, the decreases in tensile and yield strength were so small (10%) that we have no anxiety about the reduction of mechanical strength. Based on the above results, to reduce the hydrogen content, the Ti bellows and ducts for the RCS have been vacuum fired at 650C for 8 hr and at 750C for 8 hr, respectively.
