Decommissioning activities and R&D of nuclear facilities in the second midterm plan

Terunuma, Akihiro; Mimura, Ryuji; Nagashima, Hisao; Aoyagi, Yoshitaka; Hirokawa, Katsunori*; Uta, Masato; Ishimori, Yuu; Kuwabara, Jun; Okamoto, Hisato; Kimura, Yasuhisa; et al.

JAEA-Review 2016-008, 98 Pages, 2016/07

JAEA-Review-2016-008.pdf:11.73MB

Japan Atomic Energy Agency formulated the plan to achieve the medium-term target in the period of April 2010 to March 2015(hereinafter referred to as "the second medium-term plan"). JAEA determined the plan for the business operations of each year (hereinafter referred to as "the year plan"). This report is that the Sector of Decommissioning and Radioactive Waste Management has summarized the results of the decommissioning technology development and decommissioning of nuclear facilities which were carried out in the second medium-term plan.

High quality laser-produced proton beam generation by phase rotation

Noda, Akira*; Nakamura, Shu*; Iwashita, Yoshihisa*; Shirai, Toshiyuki*; Tongu, Hiromu*; Soda, Hikaru*; Daido, Hiroyuki; Mori, Michiaki; Kado, Masataka; Sagisaka, Akito; et al.

International Journal of Modern Physics B, 21(3&4), p.319 - 330, 2007/02

Laser ion production has been studied for downsizing of the accelerator dedicated for cancer therapy. For optimization of various parameters such as pre-pulse condition, target position, laser spot size on target, laser pulse width and so on, time of flight (TOF) measurement utilizing the detected signal by a plastic scintillation counter played an essential role for real time measurement. Protons up to 900 keV and 600 keV are produced from the thin foil targets of Ti 3 micron and 5 micron in thickness, respectively. Modification of the energy distribution of the laser-produced ions with Maxwell distribution by utilizing an RF electric field synchronized to the pulse laser, which is the rotation of the ion beam in the longitudinal phase space (phase rotation), has been demonstrated for the first time.

Development of a pumping laser system for X-ray laser research

Kawachi, Tetsuya; Kado, Masataka; Tanaka, Momoko; Hasegawa, Noboru; Nagashima, Keisuke; Sukegawa, Kota*; Lu, P.; Takahashi, Kenjiro; Namba, Shinichi; Koike, Masato; et al.

Applied Optics, 42(12), p.2198 - 2205, 2003/04

https://doi.org/10.1364/AO.42.002198

no abstracts in English

Diagnostics system of JT-60U

Sugie, Tatsuo; Hatae, Takaki; Koide, Yoshihiko; Fujita, Takaaki; Kusama, Yoshinori; Nishitani, Takeo; Isayama, Akihiko; Sato, Masayasu; Shinohara, Koji; Asakura, Nobuyuki; et al.

Fusion Science and Technology (JT-60 Special Issue), 42(2-3), p.482 - 511, 2002/09

https://doi.org/10.13182/FST02-A242

The diagnostic system of JT-60U (JT-60upgrade) is composed of about 50 individual diagnostic devices. Recently, the detailed radial profile measurements of plasma parameters have been improved, so that the internal structure of plasmas has been explored. The understanding of plasma confinement has been enhanced by density and temperature fluctuation measurements using a mm-wave reflectometer and electron cyclotron emission measurements respectively. In addition, the real-time control experiments of electron density, neutron yield, radiated power and electron temperature gradient have been carried out successfully by corresponding diagnostic devices. These measurements and the real time control contribute to improving plasma performance. Diagnostic devices for next generation fusion devices such as a CO2 laser interferometer/polarimeter and a CO2 laser collective Thomson scattering system have been developed.

Gain profile of transient collisional excitation X-ray laser

Tanaka, Momoko; Kawachi, Tetsuya; Kado, Masataka; Hasegawa, Noboru; Sukegawa, Kota*; Nagashima, Akira; Kato, Yoshiaki; Takenaka, Hisataka*

Journal de Physique, IV, 11(Pr.2), p.55 - 57, 2001/07

no abstracts in English

Introduction of a new book "Laser Measurement"

Nagashima, Akira

Nihon Butsuri Gakkai-Shi, 56(3), P. 207, 2001/03

no abstracts in English

Results of ITER physics R&D, 7; Plasma Diagnostics

Zushi, Hideki*; Sugie, Tatsuo; Kusama, Yoshinori; Sasao, Mamiko*; Mitarai, Osamu*; Nishitani, Takeo; Nagashima, Akira; Muraoka, Katsunori*

Purazuma, Kaku Yugo Gakkai-Shi, 76(2), p.145 - 162, 2000/02

https://ci.nii.ac.jp/naid/110003827551

no abstracts in English

Development of table-top transient collisional excitation X-ray lasers

Kado, Masataka; Kawachi, Tetsuya; Hasegawa, Noboru; Tanaka, Momoko; Sukegawa, Kota*; Nagashima, Keisuke; Nagashima, Akira; Kato, Yoshiaki

High-power Lasers in Energy Engineering (Proceedings of SPIE Vol.3886), p.278 - 284, 2000/00

no abstracts in English

First measurement of tangential Faraday rotation of CO laser wave in a tokamak plasma

Kawano, Yasunori; Chiba, Shinichi; Shirai, Hiroshi; *; Nagashima, Akira

Review of Scientific Instruments, 70(2), p.1430 - 1434, 1999/02

https://doi.org/10.1063/1.1149601

no abstracts in English

Development of steady-state magnetic sensor

*; Nagashima, Akira; *; Kasai, Satoshi; Nishitani, Takeo

Review of Scientific Instruments, 70(1), p.435 - 438, 1999/01

https://doi.org/10.1063/1.1149507

no abstracts in English