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Journal Articles

On-site background measurements for the J-PARC E56 experiment; A Search for the sterile neutrino at J-PARC MLF

Ajimura, Shuhei*; Bezerra, T. J. C.*; Chauveau, E.*; Enomoto, T.*; Furuta, Hisataka*; Harada, Masahide; Hasegawa, Shoichi; Hiraiwa, T.*; Igarashi, Yoichi*; Iwai, Eito*; et al.

Progress of Theoretical and Experimental Physics (Internet), 2015(6), p.063C01_1 - 063C01_19, 2015/06

 Times Cited Count:6 Percentile:45.45(Physics, Multidisciplinary)

The J-PARC E56 experiment aims to search for sterile neutrinos at the J-PARC Materials and Life Science Experimental Facility (MLF). In order to examine the feasibility of the experiment, we measured the background rates of different detector candidate sites, which are located at the third floor of the MLF, using a detector consisting of plastic scintillators with a fiducial mass of 500 kg. The gammas and neutrons induced by the beam as well as the backgrounds from the cosmic rays were measured, and the results are described in this article.

Journal Articles

Recent progress in the energy recovery linac project in Japan

Sakanaka, Shogo*; Akemoto, Mitsuo*; Aoto, Tomohiro*; Arakawa, Dai*; Asaoka, Seiji*; Enomoto, Atsushi*; Fukuda, Shigeki*; Furukawa, Kazuro*; Furuya, Takaaki*; Haga, Kaiichi*; et al.

Proceedings of 1st International Particle Accelerator Conference (IPAC '10) (Internet), p.2338 - 2340, 2010/05

Future synchrotron light source using a 5-GeV energy recovery linac (ERL) is under proposal by our Japanese collaboration team, and we are conducting R&D efforts for that. We are developing high-brightness DC photocathode guns, two types of cryomodules for both injector and main superconducting (SC) linacs, and 1.3 GHz high CW-power RF sources. We are also constructing the Compact ERL (cERL) for demonstrating the recirculation of low-emittance, high-current beams using above-mentioned critical technologies.

Journal Articles

Progress in R&D efforts on the energy recovery linac in Japan

Sakanaka, Shogo*; Ago, Tomonori*; Enomoto, Atsushi*; Fukuda, Shigeki*; Furukawa, Kazuro*; Furuya, Takaaki*; Haga, Kaiichi*; Harada, Kentaro*; Hiramatsu, Shigenori*; Honda, Toru*; et al.

Proceedings of 11th European Particle Accelerator Conference (EPAC '08) (CD-ROM), p.205 - 207, 2008/06

Future synchrotron light sources based on the energy-recovery linacs (ERLs) are expected to be capable of producing super-brilliant and/or ultra-short pulses of synchrotron radiation. Our Japanese collaboration team is making efforts for realizing an ERL-based hard X-ray source. We report recent progress in our R&D efforts.

Journal Articles

Chemical studies on rutherfordium (Rf) at JAERI

Nagame, Yuichiro; Tsukada, Kazuaki; Asai, Masato; Toyoshima, Atsushi; Akiyama, Kazuhiko; Ishii, Yasuo; Sato, Tetsuya; Hirata, Masaru; Nishinaka, Ichiro; Ichikawa, Shinichi; et al.

Radiochimica Acta, 93(9-10), p.519 - 526, 2005/00

 Times Cited Count:29 Percentile:87.12(Chemistry, Inorganic & Nuclear)

no abstracts in English

Journal Articles

Fluoride complexation of element 104, rutherfordium

Haba, Hiromitsu*; Tsukada, Kazuaki; Asai, Masato; Toyoshima, Atsushi; Akiyama, Kazuhiko; Nishinaka, Ichiro; Hirata, Masaru; Yaita, Tsuyoshi; Ichikawa, Shinichi; Nagame, Yuichiro; et al.

Journal of the American Chemical Society, 126(16), p.5219 - 5224, 2004/04

 Times Cited Count:43 Percentile:72.54(Chemistry, Multidisciplinary)

Fluoride complexation of element 104, rutherfordium (Rf), produced in the $$^{248}$$Cm($$^{18}$$O,5n)$$^{261}$$Rf reaction has been studied by anion-exchange chromatography on an atom-at-a-time scale. The anion-exchangechromatographic behavior of Rf was investigated in 1.9-13.9 M hydrofluoric acid together with those of the group-4 elements Zr and Hf produced in the $$^{18}$$O-induced reactions on Ge and Gd targets, respectively. It was found that the adsorption behavior of Rf on anion-exchange resin is quite different from those of Zr and Hf, suggesting the influence of relativistic effect on the fluoride complexation of Rf.

JAEA Reports

Development of high power klystron, 1

Hirano, Koichiro; Emoto, Takashi; Wang, Y.; Enomoto, Y; Sato, Isamu

PNC TN9410 96-071, 32 Pages, 1996/03

PNC-TN9410-96-071.pdf:1.11MB

(Objectives) A high power klystron that generates 1.2 MW radio frequency at 1.249135GHz is required for the high power CW electron linac development. The first prototype klystron was limited RF output of 330kW with CW-mode operation and 780kW with pulse-mode operation (50 msec pulse width, 1 pps) because the window temperature reached near the critical point of destruction by thermal stress. A long pill-box type beryllia window (long pill-box window) was designed and measured using a resonant ring in high power experiment. The long pill-box window withstood the RF output of 1.7MW(CW), that has been verified by the high power experiment. (Method) The standard pill-box prototype klystron was replaced with the long pill-box window. The high power test was carried out with the converted klystron. We measured maximum CW RF output power and observed the surface temperature rise of the ceramic window in the long pill-box. (Results)The temperature increase was 36 degrees with the long pill-box window when the klystron has achieved CW RF output power of 885kW, efficiency of 46%, and beam voltage of 85kV in present. The klystron has been optimized by simulation codes to improve better efficiency. The calculation shows the maximum efficiency is 70% using optimum parameters. (Conclusions)It was shown that the long pill-box window converted klystron had maximum transmission power that was fully satisfied with specifications of the high power klystron. The klystron with these results will be manufactured and the high power test will be carried out in 1997.

Oral presentation

Change of the micro structure of ultra high molecular weight polyethylene by irradiation

Enomoto, Ichiro*; Soeda, Shin*; Ikeda, Shigetoshi*; Kudo, Hisaaki*; Katsumura, Yosuke

no journal, , 

Ultra High Molecular Weight Polyethylene (UHMWPE) is applied as industrial material in many fields because it has properties of lightness in weight and of high endurance. Its surface needs to be reformed to overcome its deficit of low adhesion property toward other materials. It is known that radiation graft polymerization is effective to reform surfaces of hydrophobic polymeric materials although material properties may decrease due to scissions and oxidations induced by radiolytic radicals. It is believed that such effects of irradiations appear in amorphous regions and does not in crystalline regions. However, it is recently reported by using DSC measurement or XRD analysis that irradiations can affect not only amorphous but also crystalline region. This work investigates change of microscopic structures of UHMWPE in surface region of $$sim$$100 $$mu$$m, which is responsible for radiation graft polymerization. Analyses were conducted by combination of several techniques such as FT-IR, DSC, XRD and ESR.

Oral presentation

Surface modification of ultra high molecular weight polyethylene by radiation induced graft polymerization

Enomoto, Ichiro*; Soeda, Shin*; Katsumura, Yosuke; Kudo, Hisaaki*

no journal, , 

Ultra high molecular weight polyethylene (UHMWPE) has been widely used for industrial and biomaterials due to its chemical inertness, impact resistance and abrasion resistance. However, because of no reactive group on a polyethylene backbone or low surface energy, the surface is hydrophobic, not adhesive and has a low dyeing affinity. Therefore, surface treatment has been applied to modify the property. Especially, the radiation induced graft polymerization method is excellent to maintain the modification for a prolonged period. We investigated efficiency of graft polymerization of acrylic acid (AA), methyl methacrylate (MMA) and styrene (St) to the UHMWPE fiber irradiated in surface modification. Mechanisms of reactions in the radiation graft polymerization were also investigated.

Oral presentation

The Role of hydroperoxide as a precursor of radiation induced graft polymerization

Enomoto, Ichiro*; Katsumura, Yosuke; Kudo, Hisaaki*; Soeda, Shin*

no journal, , 

Ultra high molecular weight polyethylene (UHMWPE) has been widely used for industrial and biomaterials due to its chemical inertness, impact resistance and abrasion resistance. However, because of no reactive group on a polyethylene backbone or low surface energy, the surface is hydrophobic, not adhesive and has a low dyeing affinity. Therefore, surface treatment has been applied to modify the property. Especially, the radiation induced graft polymerization method is excellent to maintain the modification for a prolonged period. We investigated efficiency of graft polymerization of acrylic acid (AA), methyl methacrylate (MMA) and styrene (St) to the UHMWPE fiber irradiated in surface modification. Mechanisms of reactions in the radiation graft polymerization were also investigated. Especially, role of hydroperoxide as a precursor of radiation-induced polymerization was investigated.

Oral presentation

Dyeing properties of radiation grafted ultra high molecular weight polyethylene

Enomoto, Ichiro*; Katsumura, Yosuke; Soeda, Shin*; Fujishiro, Satoshi*

no journal, , 

no abstracts in English

Oral presentation

Research and development on preceding processing methods for contaminated water management waste at Fukushima Daiichi Nuclear Power Station, 7; Numerical analysis of temperature rise of solidified waste by radiation applying various container shapes

Hiraki, Yoshihisa; Enomoto, Mayu*; Terasawa, Toshiharu*; Imaizumi, Ken*; Kato, Jun; Osugi, Takeshi; Sone, Tomoyuki; Kuroki, Ryoichiro

no journal, , 

Evaluate the maximum temperature of solidified body, when Secondary Waste Produced from Contaminated Water Treatment at Fukushima Daiichi NPP is solidified with cement etc. Simulate various container shapes, and analysis using the radiation transport code and the thermal analysis code was performed. The summary of the test and some of the obtained results are introduced.

Oral presentation

Research and development on preceding processing methods for contaminated water management waste at Fukushima Daiichi Nuclear Power Station, 22; Evaluation of heat generation on OPC and AAM solidified body

Takahashi, Yuta; Kakuda, Ayaka; Enomoto, Mayu*; Imaizumi, Ken*; Osugi, Takeshi; Sone, Tomoyuki; Kuroki, Ryoichiro

no journal, , 

no abstracts in English

Oral presentation

13 (Records 1-13 displayed on this page)
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