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Ino, Kohei*; Konno, Yuta*; Kozuka, Mariko*; Hirota, Akinari*; Togo, Yoko*; Fukuda, Akari*; Komatsu, Daisuke*; Tsunogai, Urumu*; Tanabe, Akifumi*; Yamamoto, Satoshi*; et al.
Environmental Microbiology Reports (Internet), 8(2), p.285 - 294, 2016/04
Times Cited Count：26 Percentile：68.59(Environmental Sciences)To understand the subsurface biosphere, borehole investigation was conducted for 300-m deep granitic rocks at the Mizunami underground research laboratory, Japan. The initial biomass was the highest with the flourish of aerobic H
-oxidizing Hydrogenophaga spp., whereas an uncultivated lineage of the phylum Nitrospirae became predominant after three years with decreasing biomass. The common occurrence of many species of Nitrospirae and Chlorobi phyla at the geographically distinct sites and the exclusive detection of their phylogenetically related environmental sequences from deep groundwaters and terrestrial hot springs, suggest that these bacteria are indigenous and potentially adapted to the deep terrestrial subsurface.
Sakaki, Hironao; Nishiuchi, Mamiko; Maeda, Shota; Sagisaka, Akito; Pirozhkov, A. S.; Pikuz, T.; Faenov, A.*; Ogura, Koichi; Fukami, Tomoyo; Matsukawa, Kenya*; et al.
Review of Scientific Instruments, 85(2), p.02A705_1 - 02A705_4, 2014/02
Times Cited Count：2 Percentile：11.24(Instruments & Instrumentation)High intensity laser-plasma interaction has attracted considerable interest for a number of years. The laser-plasma interaction is accompanied by generation of various charged particle beams. Results of simultaneous novel measurements of electron-induced photonuclear neutrons (photoneutron), which are a diagnostic of the laser-plasma interaction, are proposed to use for optimization of the laser-plasma ion generation. The proposed method is demonstrated by the laser irradiation with the intensity os 1
10
W/cm
on the metal foil target. The photoneutrons are measured by using NE213 liquid scintillation detectors. Heavy-ion signal is registered with the CR39 track detector simultaneously. The measured signals of the electron-induced photoneutrons are well reproduced by using the Particle and Heavy Ion Transport code System (PHITS). The results obtained provide useful approach for analyzing the various laser based ion beams.
Sakaki, Hironao; Fukuda, Yuji; Kanasaki, Masato; Nishiuchi, Mamiko; Jinno, Satoshi; Yogo, Akifumi; Fukami, Tomoyo; Kondo, Kiminori; Sato, Tatsuhiko; Watanabe, Yukinobu; et al.
no journal, ,
Generally, if several-tens MeV electron is dumped into some material, photons with the same energy level are created by bremsstrahlung radiation. And then neutron is generated because of the (g, n) reactions. In current researches, electron energies are getting higher as the high-energy ions are generated. Therefore, when the energy of laser driven accelerated ion exceeds several-tens of MeV, it is impossible to disregard the neutron generation from the (g, n) reactions. Although such a neutron becomes as a background-nose of the ion measurement, a quantitative evaluation has not carried out in the laser-driven ions acceleration experiments yet. We report an evaluation of those neutron properties by using measurement data in the laser-plasma interaction experiments, and it is discussed with a result of Monte Carlo simulation including the (g, n) reaction processes.
, n) reactions in the laser-driven ion acceleratorSakaki, Hironao; Fukuda, Yuji; Kanasaki, Masato; Nishiuchi, Mamiko; Jinno, Satoshi; Yogo, Akifumi; Fukami, Tomoyo; Watanabe, Yukinobu; Sato, Tatsuhiko; Niita, Koji*
no journal, ,
In current researches, electron energies are getting higher as the high-energy ions are generated. Therefore, when the energy of ion exceeds several-tens of MeV, it is impossible to disregard the neutron generation from the (, n) reactions. Although such a neutron becomes as a background-nose of the ion measurement, a quantitative evaluation has not carried out in the laser-driven ions acceleration experiments yet. We report an evaluation of those neutron properties by using measurement data in the laser-plasma interaction experiments, and it is discussed with a result of Monte Carlo simulation including the (, n) reaction processes.
, n) reaction for the laser-driven accelerationSakaki, Hironao; Fukuda, Yuji; Kanasaki, Masato; Nishiuchi, Mamiko; Jinno, Satoshi; Yogo, Akifumi; Fukami, Tomoyo; Watanabe, Yukinobu; Sato, Tatsuhiko; Niita, Koji*
no journal, ,
In current researches of laser-driven acceleration, electron energies are getting higher as the high-energy ions are generated. Therefore, when the energy of ion exceeds several-tens of MeV, it is impossible to disregard the neutron generation from the (, n) reactions. Although such a neutron becomes as a background-nose of the ion measurement, a quantitative evaluation has not carried out in the laser-driven ions acceleration experiments. We report an evaluation of those neutron properties by using measurement data in the laser-plasma interaction experiments, and it is discussed with a result of Monte Carlo simulation including the (, n) reaction processes.
Sagisaka, Akito; Nishiuchi, Mamiko; Pirozhkov, A. S.; Ogura, Koichi; Sakaki, Hironao; Maeda, Shota; Pikuz, T.; Faenov, A. Ya.*; Fukuda, Yuji; Yogo, Akifumi; et al.
no journal, ,
High-intensity laser and thin-foil interactions produce high-energy particles, hard X-ray, high-order harmonics, and terahertz radiation. A proton beam driven by a high-intensity laser has received attention as a compact ion source for medical and other applications. We have performed several high intensity laser-matter interaction experiments using a thin-foil target irradiated by Ti:sapphire laser (J-KAREN) at JAEA. The pulse duration was typically 
40 fs (FWHM). The electron density profiles of the preformed plasma were observed with the interferometer. The high temporal contrast laser system could reduce the preformed plasma. The maximum proton energy gradually increased as the laser performance improved and finally protons of 40 MeV energy were observed at the peak laser intensity of 1 10 W/cm.
Yamashita, Shinichiro; Ioka, Ikuo; Nemoto, Yoshiyuki; Shirasu, Noriko; Kurata, Masaki; Kaji, Yoshiyuki; Fukahori, Tokio; Watanabe, Seiichi*; Kirimura, Kazuki*; Kakiuchi, Kazuo*; et al.
no journal, ,
Since the accident at Fukushima Daiichi Nuclear Power Station, enhancing the accident tolerance of Light Water Reactors (LWRs) became a topic of serious discussion, and the research and development (R&D) for improving the safety LWRs has been activated in many countries. In Japan, the R&D project on accident tolerant fuel and other components (ATFs) of LWRs, which is sponsored and organized by the Ministry of Economy, Trade and Industry (METI), has been initiated in 2015 for establishing technical basis of ATFs. The Japan Atomic Energy Agency (JAEA) has coordinated and carried out this ATF R&D project in cooperation with power plant providers, fuel venders and universities for making the best use of the experiences, knowledges in commercial uses of zirconium-base alloys in LWRs.
Yamashita, Shinichiro; Ioka, Ikuo; Nemoto, Yoshiyuki; Shirasu, Noriko; Kurata, Masaki; Kaji, Yoshiyuki; Fukahori, Tokio; Watanabe, Seiichi*; Murakami, Nozomu*; Sato, Hisaki*; et al.
no journal, ,
Since the accident at Fukushima Daiichi Nuclear Power Station, enhancing the accident tolerance of Light Water Reactors (LWRs) became a topic of serious discussion, and the research and development for improving the safety LWRs has been activated in many countries. This project is one of the projects that entrusted from the Ministry of Economy, Trade and Industry Agency for Natural Resources and Energy. Using a domestic human source, an analysis tool, know-how and experience, the basic technique to apply an accident tolerant fuel material to an existing LWRs is developed in the project. It is started from October, 2015 and is carrying out this project continuously.
Yamashita, Shinichiro; Ioka, Ikuo; Nemoto, Yoshiyuki; Kawanishi, Tomohiro; Kaji, Yoshiyuki; Fukahori, Tokio; Nozawa, Takashi*; Watanabe, Seiichi*; Murakami, Nozomu*; Sato, Hisaki*; et al.
no journal, ,
Yamashita, Shinichiro; Ioka, Ikuo; Nemoto, Yoshiyuki; Kawanishi, Tomohiro; Kaji, Yoshiyuki; Fukahori, Tokio; Nozawa, Takashi*; Watanabe, Seiichi*; Murakami, Nozomu*; Sato, Hisaki*; et al.
no journal, ,
Yamashita, Shinichiro; Ioka, Ikuo; Nemoto, Yoshiyuki; Kurata, Masaki; Kawanishi, Tomohiro; Kaji, Yoshiyuki; Fukahori, Tokio; Watanabe, Seiichi*; Murakami, Nozomu*; Sato, Hisaki*; et al.
no journal, ,
In Japan, research and development (R&D) program for establishing technical basis of ATF started in 2015 and is being conducted in cooperation with power plant providers, fuel venders and universities for making the most use of the experiences in R&D, practical design, and evaluations of fuels and cores of commercial LWRs. The present paper reviews the progress of the development and summarizes subjects to be solved for ATF cladding, based on the attribute guide which was originally drawn up in the Japanese ATF R&D program as it should be an indicator of proper ATF development guidance.
Lan, Z.*; Yogo, Akifumi*; Mirfayzi, S. R.*; Hayakawa, Takehito*; Koizumi, Mitsuo; Wei, T.*; Shi, B.*; Ishimoto, Takashi*; Golovin, D.*; Mori, Takato*; et al.
no journal, ,
Yogo, Akifumi*; Mirfayzi, S. R.*; Arikawa, Yasunobu*; Abe, Yuki*; Iwamoto, Akihumi*; Hayakawa, Takehito*; Koizumi, Mitsuo; Golovin, D.*; Mori, Takato*; Lan, Z.*; et al.
no journal, ,
no abstracts in English
Takada, Chie; Nakano, Masanao; Munakata, Masahiro; Yoshida, Tadayoshi; Yokosuka, Yoshiyuki; Yamada, Junya; Maeda, Eita; Watanabe, Yuki; Tomioka, Akifumi; Momose, Takumaro
no journal, ,
no abstracts in English
Lan, Z.*; Yogo, Akifumi*; Mirfayzi, S. R.*; Koizumi, Mitsuo; Hayakawa, Takehito*; Arikawa, Yasunobu*; Abe, Yuki*; Golovin, D.*; Mori, Takato*; Wei, T.*; et al.
no journal, ,
Takada, Chie; Nakano, Masanao; Munakata, Masahiro; Yoshida, Tadayoshi; Yokosuka, Yoshiyuki; Yamada, Junya; Maeda, Eita; Watanabe, Yuki; Tomioka, Akifumi; Momose, Takumaro
no journal, ,
no abstracts in English
