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Journal Articles

Research facilities for International Fusion Energy Research Centre of Broader Approach Activities at Rokkasho

Ohira, Shigeru; Utsumi, Shigeo*; Kubo, Takashi; Yonemoto, Kazuhiro; Kasuya, Kenichi; Ejiri, Shintaro; Kimura, Haruyuki; Okumura, Yoshikazu

Journal of Plasma and Fusion Research SERIES, Vol.9, p.665 - 669, 2010/08

Under the Agreement Between the Government of Japan and the EURATOM for the Joint Implementation of the Broader Approach Activities (BA Activities) in the Field of Fusion Energy Research, JAEA develop a new site at Rokkasho-mura in Aomori prefecture of Japan as the Japanese Implementing Agency. In this new site, two of the three projects of the BA Activities are to be implemented, namely, International Fusion Energy Research Center (IFERC) Project and International Fusion Material Irradiation Facility/Engineering Validation and Engineering Design Activity (IFMIF/EVEDA) Project. In March 2009, the Administration and Research Building was completed, and the other research facilities; CSC&REC Building, DEMO R&D Building and IFMIF/EVEDA Accelerator Building will be completed in March 2010. In this presentation, the specifications and construction schedule of the individual research buildings will be presented, especially special features of the IFMIF/EVEDA Accelerator Building.

Journal Articles

A High pressure experiment of powder neutron diffraction on the HRPD at JRR-3

Komatsu, Kazuki*; Arima, Hiroshi*; Kagi, Hiroyuki*; Okuchi, Takuo*; Sasaki, Shigeo*; Yamauchi, Hiroki; Fukazawa, Hiroshi; Igawa, Naoki; Utsumi, Wataru; Kamiyama, Takashi*

Koatsuryoku No Kagaku To Gijutsu, 18(2), p.170 - 172, 2008/05

In this short communication, we report neutron diffractions under high pressure from lead powder in a Paris-Edinburgh cell at the High Resolution Powder Diffractometer (HRPD) installed at JRR-3, Ibaraki, Japan. This is the kick-off experiment in Japan as a high pressure powder diffraction study using reactor neutron source.

Oral presentation

Preparation of Broader Approach Rokkasho Site

Okumura, Yoshikazu; Ohira, Shigeru; Ejiri, Shintaro; Takemoto, Jumpei; Utsumi, Shigeo*; Kimura, Ai*

no journal, , 

JAEA, which is the Japanese Implementation Agency under the Broader Approach Agreement, plan to carried out the projects of International Fusion Energy Research Centre and International Fusion Material Irradiation Facility-Engineering Validation and Engineering Design Activity at the Rokkasho Site. For implementation of the projects, site preparation including construction of research facilities will be initiated in Japanese fiscal year 2008. In this presentation, outlines of site and buildings are presented and current status and future plans are also described.

Oral presentation

High-pressure powder neutron diffraction measurements using PE cell at JRR

Arima, Hiroshi; Komatsu, Kazuki*; Kagi, Hiroyuki*; Okuchi, Takuo*; Sasaki, Shigeo*; Yamauchi, Hiroki; Fukazawa, Hiroshi; Igawa, Naoki; Utsumi, Wataru; Kamiyama, Takashi*

no journal, , 

For the forward planning of high-pressure neutron diffraction study, it is meaningful to consider the use of Paris-Edinburgh (PE) high pressure cells. We conducted a first experiment for high-P powder diffraction using PE cells on the high resolution powder diffractometer (HRPD) in the reactor neutron source: JRR-3. Lead particle (Nilaco Co., 99.9999%), which has a relatively high scattering length and low absorption for neutron, was used as a sample in order to obtain the intensity data as efficient as possible. A couple of cubic BN anvils and a TiZr null metal gasket were used in order to avoid scattering from surrounding materials. The intensities of a 111 reflection, which is the strongest peak in lead sample, are 250 counts/h at ambient pressure and 80 counts/h at 30 tonnes. The pressure estimated by the obtained lattice constants at 30 tonnes was 2.9(1) GPa. These results allows us to estimate how long beam time is necessary for the potential experiments.

Oral presentation

High-pressure neutron diffraction experiments at TAKUMI in J-PARC

Abe, Jun; Hattori, Takanori; Arima, Hiroshi; Sano, Asami; Fukazawa, Hiroshi; Utsumi, Wataru; Komatsu, Kazuki*; Arakawa, Masashi*; Iizuka, Riko*; Kagi, Hiroyuki*; et al.

no journal, , 

In order to confirm the feasibility of high-pressure neutron diffraction at TAKUMI, we have performed a number of R&Ds using a various high-pressure devices. Optimization of materials such as anvil and pressure medium and developments of collimators have made possible reduction of background and contamination noise. Incident and diffracted neutron beams travel through high-pressure device, which causes attenuation of neutron. We investigated the method of attenuation correction.

Oral presentation

High-pressure activities in the new pulsed neutron source J-PARC

Hattori, Takanori; Arima, Hiroshi; Sano, Asami; Abe, Jun; Honda, Mitsunori; Fukazawa, Hiroshi; Utsumi, Wataru; Okuchi, Takuo*; Ono, Yoshiki*; Sasaki, Shigeo*; et al.

no journal, , 

The high-pressure neutron experiments above 10 GPa are limited so far due to the small neutron flux, which is insufficient for tiny high-pressure sample. Recent construction of the intense pulsed neutron source around the world has changed the situation. Inspired by the new Japanese pulsed neutron source JSNS at J-PARC, we started the high-P neutron experiments at the already operated beamlines (TAKUMI, NOVA) and the construction of the new beamline dedicated for high-pressure use (PLANET). This talk introduces these activities.

Oral presentation

Powder neutron diffraction study using high-pressure cells at J-PARC/TAKUMI

Abe, Jun; Arima, Hiroshi; Hattori, Takanori; Sano, Asami; Fukazawa, Hiroshi; Utsumi, Wataru; Komatsu, Kazuki*; Arakawa, Masashi*; Iizuka, Riko*; Kagi, Hiroyuki; et al.

no journal, , 

We have performed high-pressure neutron diffraction experiments at TAKUMI in J-PARC. Three types of high-pressure devices are used, Paris-Edinburgh Press, Palm cubic anvil cell and NPD-DAC. Optimization of materials such as anvil and pressure medium and developments of collimators have made possible reduction of background and contamination noise. Incident and diffracted neutron beams travel through high-pressure device, which causes attenuation of neutron. We have studied the method of attenuation correction and analyzed crystal structure using corrected neutron diffraction pattern.

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