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Kamiya, Junichiro; Hikichi, Yusuke; Kinsho, Michikazu; Ogiwara, Norio; Fukuda, Mitsuhiro*; Hamatani, Noriaki*; Hatanaka, Kichiji*; Kamakura, Keita*; Takahisa, Keiji*
Journal of Vacuum Science and Technology A, 33(3), p.031605_1 - 031605_8, 2015/05
Times Cited Count：5 Percentile：22.77(Materials Science, Coatings & Films)For the vacuum systems of high-intensity beam accelerators, low radioactivation materials with good vacuum characteristics and high mechanical strength are required. The titanium alloy Ti-6Al-4V was investigated as a potential low activation vacuum material with high mechanical strength for the fabrication of vacuum components, particularly the flanges of beam pipes, in the J-PARC 3 GeV synchrotron. The dose rate of Ti-6Al-4V when irradiated by a 400 MeV proton was observed to decrease more rapidly than that of stainless steel. Furthermore, the generated radioactive isotopes were nuclides with relatively short half-lives. The outgassing rate of Ti-6Al-4V was the same as the typical value for stainless steel. Additionally, the hydrogen concentration in bulk Ti-6Al-4V was reduced to approximately 1 ppm by vacuum firing. These results indicate that Ti-6Al-4V is a good candidate for use as a low activation vacuum material with high mechanical strength.
Kamiya, Junichiro; Ogiwara, Norio; Kinsho, Michikazu; Kamakura, Keita*; Hamatani, Noriaki*; Hatanaka, Kichiji*; Fukuda, Mitsuhiro*; Takahisa, Keiji*
Journal of the Vacuum Society of Japan, 56(5), p.167 - 171, 2013/05
no abstracts in English
Iwamoto, Yosuke; Fukuda, Mitsuhiro*; Sakamoto, Yukio; Tamii, Atsushi*; Hatanaka, Kichiji*; Takahisa, Keiji*; Nagayama, Keiichi*; Asai, Hiroaki*; Sugimoto, Kenji*; Nashiyama, Isamu*
Nuclear Technology, 173(2), p.210 - 217, 2011/02
Times Cited Count：30 Percentile：89.62(Nuclear Science & Technology)The 30 
white neutron beam at RCNP facility has been characterized as a prove suitable for testing of single event effects (SEEs) in semiconductors in the neutron energy range from 1 to 300 MeV using the 392-MeV proton incident reaction on a 6.5-cm-thick tungsten target. The neutron spectrum in measurements were demonstrated to provide a neutron spectrum similar to the terrestrial one at sea level, but with an enhancement in the intensity of a factor of 1.5
10
. The average neutron intensity and spectrum from 10 to 300 MeV at RCNP were almost same as those at WNR. The calculated RCNP neutron flux using PHITS generally agreed with the measured RCNP data within a factor of two. As the neutron density per pulse for RCNP is 500 times lower than that for WNR, the pileup probability of single-event transient currents and false multiple-bit upsets is reduced. Such conditions at RCNP are suitable for accelerated SEE testing to get meaningful results in realistic time frame.
clusters in 
Li and 
LiNakayama, Shintaro*; Yamagata, Tamio*; Akimune, Hidetoshi*; Daito, Izuru*; Fujimura, Hisako*; Fujita, Yoshitaka*; Fujiwara, Mamoru; Fushimi, Kenichi*; Greenfield, M. B.*; Kori, Hideki*; et al.
Physical Review Letters, 87(12), p.122502_1 - 122502_4, 2001/09
Times Cited Count：22 Percentile：70.77(Physics, Multidisciplinary)no abstracts in English
HeNakayama, Shintaro*; Yamagata, Tamio*; Akimune, Hidetoshi*; Daito, Izuru*; Fujimura, Hisako*; Fujita, Yoshitaka*; Fujiwara, Mamoru; Fushimi, Kenichi*; Inomata, Toru*; Kori, Hideki*; et al.
Physical Review Letters, 85(2), p.262 - 265, 2000/07
Times Cited Count：73 Percentile：88.96(Physics, Multidisciplinary)no abstracts in English
Iwamoto, Yosuke; Sakamoto, Yukio; Fukuda, Mitsuhiro*; Tamii, Atsushi*; Takahisa, Keiji*; Hatanaka, Kichiji*; Asai, Hiroaki*; Sugimoto, Kenji*; Nashiyama, Isamu*
no journal, ,
Recently, the soft error which is induced by high energy white neutron incidence from the space have been evaluated at WNR of Los Alamos National Laboratory. In Japan, white neutron irradiation field has not been developed, therefore, it is necessary to establish Japanese neutron field for the development of Japanese own airplane and space craft. In this work, neutron energy spectra at 30 degrees for the 392MeV proton incidence were measured at RCNP, Osaka University by using Time-Of-Flight techniques, and comparison between obtained data and the data of WNR was done. As a result, the white neutron field of RCNP is suitable for irradiation field of semi-conductor because the shape of neutron energy spectra is same with WNR data and calculated result of PHITS.
