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JAEA Reports

Study on engineering technologies in the Mizunami Underground Research Laboratory; FY2012 (Contract research)

Fukaya, Masaaki*; Noda, Masaru*; Hata, Koji*; Takeda, Yoshinori*; Akiyoshi, Kenji*; Ishizeki, Yoshikazu*; Kaneda, Tsutomu*; Sato, Shin*; Shibata, Chihoko*; Ueda, Tadashi*; et al.

JAEA-Technology 2014-019, 495 Pages, 2014/08

JAEA-Technology-2014-019.pdf:82.23MB

The researches on engineering technology in the Mizunami Underground Research Laboratory (MIU) plan consists of (1) research on engineering technology deep underground, and (2) research on engineering technology as a basis of geological disposal. The former research is mainly aimed in this study, which is categorized in (a) development of design and construction planning technologies, (b) development of construction technologies, (c) development of countermeasure technologies, and (d) development of technologies for security. In this study, the researches on engineering technology are being conducted in these four categories by using data measured during construction as a part of the second phase of the MIU plan.

Journal Articles

X-ray magnetic circular dichroism study of Ce$$_{0.5}$$Gd$$_{0.5}$$Ni

Okane, Tetsuo; Takeda, Yukiharu; Yano, Kazuo*; Fujimori, Atsushi; Yamagami, Hiroshi; Nishimura, Katsuhiko*; Ishikawa, Yoshikazu*; Sato, Kiyoo*

JPS Conference Proceedings (Internet), 3, p.011028_1 - 011028_6, 2014/06

Journal Articles

Design of a 500kV electron gun for ERL light source at KEK

Yamamoto, Masahiro*; Honda, Yosuke*; Miyajima, Tsukasa*; Uchiyama, Takashi*; Kobayashi, Masanori*; Muto, Toshiya*; Matsuba, Shunya*; Sakanaka, Shogo*; Sato, Kotaro*; Saito, Yoshio*; et al.

Proceedings of 6th Annual Meeting of Particle Accelerator Society of Japan (CD-ROM), p.860 - 862, 2009/08

A newly 500 kV electron gun (2nd - 500 kV gun) for an ERL light source is designed at KEK. A new concept and state of-the-art technologies of vacuum system, ceramic insulators, high voltage power supply, photocathode and preparation system will be employed. The details are described in this report.

Journal Articles

JAEA photocathode DC-gun for an ERL injector

Nishitani, Tomohiro; Hajima, Ryoichi; Iijima, Hokuto; Nagai, Ryoji; Sawamura, Masaru; Kikuzawa, Nobuhiro; Nishimori, Nobuyuki; Minehara, Eisuke; Tabuchi, Masao*; Noritake, Yosuke*; et al.

Proceedings of 28th International Free Electron Laser Conference (FEL 2006) (CD-ROM), p.319 - 322, 2006/08

ERL light source and FEL require an electron beam of large current and small emittance. In order to realize an electron gun satisfying such requirements,we started developments of a photocathode DC-gun and a new-type NEA-photocathode. The DC-gun consists of a chamber to activate NEA-surface, a 250 keV acceleration chamber, and a mode-locked Ti:Sapphire laser. Since extreme high vacuum is essential to obtain a long-life photocathode, we adopt a load-lock system for transporting a photocathode between the chambers, each of which is equipped with an NEG pump. Up to now, we fabricated an electrodes chamber and a high voltage terminal of 250 kV and we succeeded in a 250kV high voltage test. We also have suggested a superlattice photocathode as a new-type photocathode with higher performance than an existing technology. Up to now, we fabricated photocathode samples by molecular beam epitaxy and measured a quantum efficiency after NEA-surface activation.

Journal Articles

High-brightness electron source using NEA-AlGaAs photocathode

Nishitani, Tomohiro; Tabuchi, Masao*; Noritake, Yosuke*; Hayashitani, Haruhiko*; Hajima, Ryoichi; Iijima, Hokuto; Nagai, Ryoji; Sawamura, Masaru; Kikuzawa, Nobuhiro; Nishimori, Nobuyuki; et al.

Proceedings of 3rd Annual Meeting of Particle Accelerator Society of Japan and 31st Linear Accelerator Meeting in Japan (CD-ROM), p.45 - 47, 2006/00

no abstracts in English

Journal Articles

Highly polarized electrons from GaAs-GaAsP and InGaAs-AlGaAs strained-layer superlattice photocathodes

Nishitani, Tomohiro; Nakanishi, Tsutomu*; Yamamoto, Masahiro*; Okumi, Shoji*; Furuta, Fumio*; Miyamoto, Masaharu*; Kuwahara, Makoto*; Yamamoto, Naoto*; Naniwa, Kenichi*; Watanabe, Osamu*; et al.

Journal of Applied Physics, 97(9), p.094907_1 - 094907_6, 2005/05

 Times Cited Count:58 Percentile:86.84(Physics, Applied)

no abstracts in English

Oral presentation

Possibility of magnetization distribution measurements by means of polarized neutron powder diffraction under high magnetic field

Kakurai, Kazuhisa; Takeda, Masayasu; Nishihara, Yoshikazu*; Sasaki, Yuji*; Kishimoto, Mikio*; Awano, Hiroyuki*

no journal, , 

Magnetization distribution maps deduced from the measurement of polarization dependent cross-sections have provided unique information in understanding of the detailed electronic configurations in mixed valence materials and molecular magnets. Because of the limited neutron flux the method has been mostly applied to single crystal studies. In the advent of strong pulsed neutron source with intense high resolution powder diffractomer the magnetization distribution measurements by means of polarized neutron powder diffraction can become common place. The introduction of the high magnetic field may extend the applicability of the method to materials requiring high saturation field. In this lecture the polarized neutron powder diffraction experiment on Fe16N2 performed in the frame work of "Ibaraki Prefecture Neutron Utilization Working Subgroup on nano-magnetic materials" will be presented and the possibility of the method at J-PARC will be discussed.

Oral presentation

Polarized SANS study of spherical Fe-N nanoparticles for magnetic recording tape

Kikuchi, Takayuki; Oku, Takayuki; Shinohara, Takenao; Suzuki, Junichi; Ishii, Yuya; Takeda, Masayasu; Kakurai, Kazuhisa; Sasaki, Yuji*; Kishimoto, Mikio*; Yokoyama, Makoto*; et al.

no journal, , 

no abstracts in English

Oral presentation

Magnetic formfactors of particulate Fe$$_{16}$$N$$_{2}$$ measured by polarized neutrons

Ishii, Yuya; Oitani, Seiki; Takeda, Masayasu; Kakurai, Kazuhisa; Kikuchi, Takayuki; Oku, Takayuki; Shinohara, Takenao; Suzuki, Junichi; Sasaki, Yuji*; Kishimoto, Mikio*; et al.

no journal, , 

no abstracts in English

Oral presentation

Measurement of the magnetic form factor of $$alpha$$-Fe and CoFe powder by polarized neutron diffraction

Oitani, Seiki; Ishii, Yuya; Takeda, Masayasu; Kakurai, Kazuhisa; Kikuchi, Takayuki; Oku, Takayuki; Shinohara, Takenao; Suzuki, Junichi; Yokoyama, Makoto*; Nishihara, Yoshikazu*; et al.

no journal, , 

no abstracts in English

Oral presentation

NEA-AlGaAs photocathode with high brightness performance

Nishitani, Tomohiro; Hajima, Ryoichi; Takeda, Yoshikazu*; Tabuchi, Masao*; Noritake, Yosuke*

no journal, , 

no abstracts in English

Oral presentation

Possibility of magnetic materials research by means of polarized neutron powder diffraction

Kakurai, Kazuhisa; Takeda, Masayasu; Ishii, Yuya; Oitani, Seiki; Sasaki, Yuji*; Kishimoto, Mikio*; Yokoyama, Makoto*; Nishihara, Yoshikazu*

no journal, , 

Magnetization distribution maps deduced from the measurement of polarization dependent cross-sections have provided unique information in understanding of the detailed electronic configurations in mixed valence materials and molecular magnets. Because of the limited neutron flux the method has been mostly applied to single crystal studies. In the advent of strong pulsed neutron source with intense high resolution powder diffractomer the magnetization distribution measurements by means of polarized neutron powder diffraction can become common place. The introduction of the high magnetic field may extend the applicability of the method to materials requiring high saturation field. In this lecture the polarized neutron powder diffraction experiment on Fe$$_{16}$$N$$_{2}$$ and $$alpha$$-Fe fine particles performed in the frame work of "Ibaraki Prefecture Neutron Utilization Working Subgroup on nano-magnetic materials" will be presented and the possibility of the method will be discussed.

Oral presentation

Development of a high-brightness electron injector for future ERL sources

Hajima, Ryoichi; Nishitani, Tomohiro; Iijima, Hokuto; Nagai, Ryoji; Nishimori, Nobuyuki; Tabuchi, Masao*; Noritake, Yosuke*; Hayashitani, Haruhiko*; Takeda, Yoshikazu*

no journal, , 

no abstracts in English

Oral presentation

NEA-AlGaAs photocathode high brightness electron source

Nishitani, Tomohiro; Hajima, Ryoichi; Takeda, Yoshikazu*; Tabuchi, Masao*; Noritake, Yosuke*; Hayashitani, Haruhiko*

no journal, , 

no abstracts in English

Oral presentation

A Polarized SANS study of spherical Fe-N nanoparticles for magnetic recording tape, 2

Oku, Takayuki; Kikuchi, Takayuki; Oba, Yojiro; Shinohara, Takenao; Suzuki, Junichi; Ishii, Yuya; Oitani, Seiki; Takeda, Masayasu; Kakurai, Kazuhisa; Yokoyama, Makoto*; et al.

no journal, , 

no abstracts in English

Oral presentation

Evaluation of magnetic moments on particulate Fe$$_{16}$$N$$_{2}$$ by polarized neutrons

Ishii, Yuya; Takeda, Masayasu; Kakurai, Kazuhisa; Kikuchi, Takayuki; Shinohara, Takenao; Oku, Takayuki; Suzuki, Junichi; Sasaki, Yuji*; Kishimoto, Mikio*; Yokoyama, Makoto*; et al.

no journal, , 

no abstracts in English

Oral presentation

Polarization SANS study of spherical Fe-N nanoparticles for magnetic recording tape

Kikuchi, Takayuki; Oku, Takayuki; Shinohara, Takenao; Suzuki, Junichi; Ishii, Yuya; Takeda, Masayasu; Kakurai, Kazuhisa; Sasaki, Yuji*; Kishimoto, Mikio*; Yokoyama, Makoto*; et al.

no journal, , 

no abstracts in English

Oral presentation

A Polarized SANS study of spherical Fe-N nanoparticles for magnetic recording tape, 2

Kikuchi, Takayuki; Oku, Takayuki; Shinohara, Takenao; Suzuki, Junichi; Ishii, Yuya; Takeda, Masayasu; Kakurai, Kazuhisa; Sasaki, Yuji*; Kishimoto, Mikio*; Yokoyama, Makoto*; et al.

no journal, , 

no abstracts in English

Oral presentation

A Study of diameter dependence of magnetic moments on Fe$$_{16}$$N$$_{2}$$ nanoparticles by polarized neutrons diffraction

Ishii, Yuya; Takeda, Masayasu; Kakurai, Kazuhisa; Kikuchi, Takayuki; Shinohara, Takenao; Oku, Takayuki; Suzuki, Junichi; Kishimoto, Mikio*; Sasaki, Yuji*; Yokoyama, Makoto*; et al.

no journal, , 

The needle-shaped ferromagnetic metals are often used for the magnetic recording tapes. It is, however necessary to make small and spherical shape to increase the recording capacity and density. Recently, Fe$$_{16}$$N$$_2$$ round nanoparticles with diameter of 20 nm were produced by Hitachi Maxell, Ltd.. But it is difficult to obtain exact magnitude by conventional magnetometer due to the laminated layer around the Fe$$_{16}$$N$$_2$$. We performed polarized neutron diffraction measurements to determine the net magnetization. The averaged diameter of samples were used in these experiments are approximately 19, 18, 17 and 15 nm. The triple-axis neutron spectrometer, TAS-1, installed at JRR-3 was used in this experiment.

Oral presentation

A Small-angle polarized neutron scattering study of spherical Fe-N particles for magnetic recording tape

Oku, Takayuki; Kikuchi, Takayuki; Shinohara, Takenao; Suzuki, Junichi; Ishii, Yuya; Takeda, Masayasu; Kakurai, Kazuhisa; Sasaki, Yuji*; Kishimoto, Mikio*; Yokoyama, Makoto*; et al.

no journal, , 

no abstracts in English

25 (Records 1-20 displayed on this page)