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Shinto, Katsuhiro; Ichikawa, Masahiro; Takahashi, Yasuyuki*; Kubo, Takashi*; Tsutsumi, Kazuyoshi; Kikuchi, Takayuki; Kasugai, Atsushi; Sugimoto, Masayoshi; Gobin, R.*; Girardot, P.*; et al.
Proceedings of 11th Annual Meeting of Particle Accelerator Society of Japan (Internet), p.1009 - 1012, 2014/10
The prototype accelerator is being developed as an engineering validation for the International Fusion Materials Irradiation Facility (IFMIF) equipped with an accelerator-driven-type neutron source for developing fusion reactor materials. This prototype accelerator is a deuteron linear accelerator consisting of an injector, an RFQ, a superconducting linac and their auxiliaries. It aims to produce a CW D
beam with the energy and current of 9 MeV/125 mA. The injector test was completed at CEA/Saclay in 2012 for producing a CW H beam and a CW D beam with the energy and current of 100 keV/140 mA. After the beam test at CEA/Saclay, the injector was transported to the International Fusion Energy Research Centre (IFERC) located in Rokkasho, Aomori, Japan. In the end of 2013, installation of the injector was started at IFERC for the injector beam test beginning from summer 2014 in order to obtain better beam qualities to be satisfied with the injection and acceleration of the following accelerators. In this paper, some results of the injector beam test performed at CEA/Saclay and the status quo of the installation of the injector at IFERC are presented.
spp. under the ISS environmental conditions for performing exposure experiments of microbes in the Tanpopo missionKawaguchi, Yuko*; Yang, Y.*; Kawashiri, Narutoshi*; Shiraishi, Keisuke*; Takasu, Masako*; Narumi, Issey*; Sato, Katsuya; Hashimoto, Hirofumi*; Nakagawa, Kazumichi*; Tanigawa, Yoshiaki*; et al.
Origins of Life and Evolution of Biospheres, 43(4-5), p.411 - 428, 2013/10
Times Cited Count：41 Percentile：80.34(Biology)
ionsNarumi, Kazumasa; Naramoto, Hiroshi*; Yamada, Keisuke; Saito, Yuichi; Chiba, Atsuya; Takahashi, Yasuyuki*; Maeda, Yoshihito
JAEA-Review 2011-043, JAEA Takasaki Annual Report 2010, P. 155, 2012/01
no abstracts in English
ion impactsHirata, Koichi*; Saito, Yuichi; Chiba, Atsuya; Yamada, Keisuke; Takahashi, Yasuyuki*; Narumi, Kazumasa; Kamiya, Tomihiro
JAEA-Review 2011-043, JAEA Takasaki Annual Report 2010, P. 156, 2012/01
constituents passing through a thin carbon foilChiba, Atsuya; Saito, Yuichi; Narumi, Kazumasa; Takahashi, Yasuyuki; Yamada, Keisuke; Kaneko, Toshiaki*
Nuclear Instruments and Methods in Physics Research B, 269(9), p.824 - 828, 2011/05
Times Cited Count：3 Percentile：26.67(Instruments & Instrumentation)It is necessary to clarify the relationship between the internuclear distance of the cluster constituent ions and these charge states for the elucidation of mechanism of the vicinage effects which are expressed due to the interaction with matter. Therefore the coincidence measurement between divergence angles and final charge states of the constituent ions resulting from dissociation of 6-MeV C ions in a thin carbon foil were performed. The strong dependence of the final charge state of constituent ions on the initial internuclear distance of projectile ion was quantitatively indicated by the fitting analysis of the angular distributions for various final charge-state combinations using the Monte Carlo particle trajectory simulation.
Hirata, Koichi*; Saito, Yuichi; Chiba, Atsuya; Yamada, Keisuke; Takahashi, Yasuyuki*; Narumi, Kazumasa
Review of Scientific Instruments, 82(3), p.033101_1 - 033101_5, 2011/03
Times Cited Count：10 Percentile：44.79(Instruments & Instrumentation) ionsChiba, Atsuya; Saito, Yuichi; Narumi, Kazumasa; Takahashi, Yasuyuki; Yamada, Keisuke; Kaneko, Toshiaki*
JAEA-Review 2010-065, JAEA Takasaki Annual Report 2009, P. 163, 2011/01
The evaluation of the charge state and charge exchange process of the cluster constituent ions inside solid is extremely important for the clarification of the vicinage effect, because the essential interaction forces such as stopping power, wake force and Coulomb repulsion is strongly correlated to the charge state of individual constituent ions. Therefore, the measurement of the divergence angular distributions classified into the charge-state combination of constituent ions resulting from foil-induced dissociation of 6-MeV C ions was carried out in order to investigate the relationship between the internuclear distance and the charge state of individual constituent ions. We suggests that the final charge-state combination of constituents emerging from the foil depends on the initial internuclear-distance which is fluctuated due to a vibration excitation of C ion.
Hirata, Koichi*; Saito, Yuichi; Chiba, Atsuya; Yamada, Keisuke; Takahashi, Yasuyuki; Narumi, Kazumasa
Nuclear Instruments and Methods in Physics Research B, 268(19), p.2930 - 2932, 2010/10
Times Cited Count：3 Percentile：28.83(Instruments & Instrumentation)
ionsTakahashi, Yasuyuki; Narumi, Kazumasa; Chiba, Atsuya; Saito, Yuichi; Yamada, Keisuke; Ishikawa, Norito; Sugai, Hiroyuki; Maeda, Yoshihito
EPL; A Letters Journal Exploring the Frontiers of Physics, 88(6), p.63001_1 - 63001_6, 2009/12
Times Cited Count：7 Percentile：45.5(Physics, Multidisciplinary)C and C
ions with 62.5-250 keV/u were incident on self-supporting amorphous carbon foils of 1.4-150 
g/cm
(70-7500 
). The secondary electrons emitted in the forward direction from a carbon foil were detected by a microchannel-plate detector placed at the exit side of the target. The vicinage effect on the secondary-electron yield was evaluated with the ratio of the secondary-electron yield R = 
/2, where and are the yields induced by the C and C ion with the same velocity, respectively. For the first time the disappearance of the vicinage effect on the secondary-electron yield from amorphous carbon foils bombarded with 62.5 keV/u C ions was observed for thick foils of 61-150 g/cm. The internuclear distance between the fragment ions at the exit of the target was evaluated by calculating trajectories of the fragment ions considering the Coulomb explosion. For a 62.5 keV/u C ion, we have determined the threshold internuclear distance where the vicinage effect disappears exits between 6 and 23 . It is expected that the vicinage effect on the energy loss (production process) in this velocity region disappears at the internuclear distance of a few . This result means that the transport or transmission process is important for the appearance of the vicinage effect. Moreover, the threshold internuclear distance depends on the velocity of the ion and increases as the velocity increases. The average charge of the ion increases with increase of the velocity of the ion. These mean that there is a possibility that a charge state plays an important role in the origin of the vicinage effect. In order to account for the experimental results, we discussed two models taking account of two kinds of potentials induced in response to the charge of the fragment ion in the transport process.
Hasegawa, Shin; Sato, Ken*; Narita, Tadashi*; Suzuki, Yasuyuki; Takahashi, Shuichi; Morishita, Norio; Maekawa, Yasunari
Journal of Membrane Science, 345(1-2), p.74 - 80, 2009/12
Times Cited Count：33 Percentile：70.33(Engineering, Chemical)Radiation-induced graft polymerization of styrene into poly(ether ether ketone) (PEEK) with 32% crystallinity was investigated with DSC, TGA, XRD, and ESR. Endothermic heats of melting of the original and styrene-grafted PEEK (grafted PEEK) films were similar, indicating the crystallinity was almost completely maintained up to a grafting degree of 51%. Lower glass transition temperature of the grafted PEEK film in the DSC, and the absence of an extra halo originating from amorphous polystyrene grafts in the XRD strongly indicate the grafting of styrene to crystalline PEEK films proceeded in the amorphous region of PEEK. This is probably because polystyrene grafts have hydrocarbon structures similar to a base PEEK polymer, resulting in compatibility to the amorphous phase of the PEEK films. The grafted PEEK films can be converted to PEEK-based electrolyte membranes by subsequent sulfonation, and had conductivity of more than 0.01 S/cm and exhibited higher water content above 100%.
Saito, Yuichi; Chiba, Atsuya; Narumi, Kazumasa; Takahashi, Yasuyuki
JAEA-Conf 2008-012, p.130 - 133, 2009/03
no abstracts in English
Chiba, Atsuya; Saito, Yuichi; Narumi, Kazumasa; Adachi, Masahiro; Yamada, Keisuke; Takahashi, Yasuyuki; Kaneko, Toshiaki*
JAEA-Conf 2008-012, p.84 - 86, 2009/03
no abstracts in English
Yamasaki, Chisato*; Murakami, Katsuhiko*; Fujii, Yasuyuki*; Sato, Yoshiharu*; Harada, Erimi*; Takeda, Junichi*; Taniya, Takayuki*; Sakate, Ryuichi*; Kikugawa, Shingo*; Shimada, Makoto*; et al.
Nucleic Acids Research, 36(Database), p.D793 - D799, 2008/01
Times Cited Count：51 Percentile：71.25(Biochemistry & Molecular Biology)Here we report the new features and improvements in our latest release of the H-Invitational Database, a comprehensive annotation resource for human genes and transcripts. H-InvDB, originally developed as an integrated database of the human transcriptome based on extensive annotation of large sets of fulllength cDNA (FLcDNA) clones, now provides annotation for 120 558 human mRNAs extracted from the International Nucleotide Sequence Databases (INSD), in addition to 54 978 human FLcDNAs, in the latest release H-InvDB. We mapped those human transcripts onto the human genome sequences (NCBI build 36.1) and determined 34 699 human gene clusters, which could define 34 057 protein-coding and 642 non-protein-coding loci; 858 transcribed loci overlapped with predicted pseudogenes.
fragment ions emerging from a thin carbon foilChiba, Atsuya; Saito, Yuichi; Narumi, Kazumasa; Yamada, Keisuke; Takahashi, Yasuyuki
no journal, ,
no abstracts in English
Saito, Yuichi; Chiba, Atsuya; Narumi, Kazumasa; Takahashi, Yasuyuki
no journal, ,
no abstracts in English
ions with ion-beam analysis, 2Narumi, Kazumasa; Naramoto, Hiroshi*; Takahashi, Yasuyuki; Yamada, Keisuke; Saito, Yuichi; Chiba, Atsuya; Adachi, Masahiro; Maeda, Yoshihito
no journal, ,
no abstracts in English
Takahashi, Yasuyuki; Narumi, Kazumasa; Chiba, Atsuya; Saito, Yuichi; Yamada, Keisuke; Ishikawa, Norito; Sugai, Hiroyuki; Maeda, Yoshihito
no journal, ,
no abstracts in English
Takahashi, Yasuyuki; Narumi, Kazumasa; Chiba, Atsuya; Saito, Yuichi; Yamada, Keisuke; Ishikawa, Norito; Sugai, Hiroyuki; Maeda, Yoshihito
no journal, ,
no abstracts in English
ionsTakahashi, Yasuyuki; Narumi, Kazumasa; Chiba, Atsuya; Saito, Yuichi; Yamada, Keisuke; Ishikawa, Norito; Sugai, Hiroyuki; Maeda, Yoshihito
no journal, ,
no abstracts in English
Chiba, Atsuya; Saito, Yuichi; Narumi, Kazumasa; Takahashi, Yasuyuki; Yamada, Keisuke; Kaneko, Toshiaki*
no journal, ,
no abstracts in English
