Development of in-reactor observation system using Cherenkov light, 5

Otsuka, Noriaki; Takeuchi, Tomoaki; Yamamoto, Keiichi; Shibata, Akira; Kimura, Nobuaki; Takemoto, Noriyuki; Tanimoto, Masataka; Tsuchiya, Kunihiko; Sano, Tadafumi*; Unesaki, Hironobu*; et al.

KURRI Progress Report 2013, P. 215, 2014/10

http://www.rri.kyoto-u.ac.jp/PUB/report/PR/ProgRep2013/CO3.pdf#page=2

Investigation of a relation between reactor power and brightness of Cherenkov light at Kyoto University Research reactor (KUR) by a CCD camera was performed due to a development of a real-time in-core measurement technique using Cherenkov light. Analyzing the brightness value of individual RGB color component at each pixel, some of the G and B brightness values reached the maximum value of 8-bit binary number, i.e. 255, above about 2-3 MW. Therefore, we corrected the G and B brightness values by the R signals whose brightness value did not saturate even at 5 MW, the maximum reactor power of KUR. Then, the total brightness value was in proportion to the reactor power after the correction. These results indicate the reactor power can be estimated by the observation of Cherenkov light.

Source development and novel applications of laser-driven plasma X-ray lasers in JAEA

Kawachi, Tetsuya; Hasegawa, Noboru; Nishikino, Masaharu; Ishino, Masahiko; Imazono, Takashi; Oba, Toshiyuki; Kaihori, Takeshi; Kishimoto, Maki; Ochi, Yoshihiro; Tanaka, Momoko; et al.

X-Ray Lasers 2010; Springer Proceedings in Physics, Vol.136, p.15 - 24, 2011/12

http://ci.nii.ac.jp/ncid/BB05543208

This paper reviews recent improvement in the source development of laser-driven X-ray lasers and the applications in the research fields of material science, laser processing, X-ray imaging, and radiation damage in biological cells. In the application for material science, we have firstly observed temporal correlation between the domain structures of ferro-electric substance under the Curie temperature. In the laser processing, new X-ray laser interferometer reveals us the nano-scale surface distortion of substance pumped by a femto-second optical pulse. In the X-ray diffraction image, we have taken several static images of micro-structure of samples: now we are trying to extend the objective to nano-scale dynamics using pump and probe method. In the radiation damage of biological cells, we observed double strand break in DNA using X-ray laser exposure; this results are compared with the case using incoherent several KeV X-ray exposure.

Development of a specimen holder combined with ultra thin film laser plasma X-ray source for compact contact-type soft X-ray microscope to observe hydrated living biologocal cells

Ishino, Masahiko; Kado, Masataka; Shinohara, Kunio*; Yamamoto, Yoshimasa*; Hirai, Itaru*; Kishimoto, Maki; Nishikino, Masaharu; Hasegawa, Noboru; Tamotsu, Satoshi*; Yasuda, Keiko*; et al.

Proceedings of SPIE Europe Optics + Optoelectronics 2011, Vol.8139, p.81390R_1 - 81390R_8, 2011/09

https://doi.org/10.1117/12.892864

Ultra thin gold films are favorable laser plasma targets for a soft X-ray microscopy, because the thin films emit intense soft X-rays at the wavelength of water window region. Using rear side emissions, the distance between the X-ray source and the specimens can be reduced so that the X-ray flux on specimens increases. The microscope system can be designed to be compact when the specimen holder and X-ray source are combined in one piece. The biological specimen holder combined with an ultra thin film target has been developed. This X-ray microscope system needs not any X-ray optics which causes a decrease in X-ray photons for imaging. X-ray images of hydrated living cells have been obtained successfully by use of the newly developed specimen holder. Specimen holder combined with plasma X-ray source will be a key component of a compact soft X-ray microscope using in a laboratory.

Mizunami Underground Research Laboratory Project, Annual report for fiscal year 2006

Nishio, Kazuhisa; Matsuoka, Toshiyuki; Mikake, Shinichiro; Tsuruta, Tadahiko; Amano, Kenji; Oyama, Takuya; Takeuchi, Ryuji; Saegusa, Hiromitsu; Hama, Katsuhiro; Yoshida, Haruo*; et al.

JAEA-Review 2009-001, 110 Pages, 2009/03

JAEA-Review-2009-001.pdf:49.84MB

Japan Atomic Energy Agency (JAEA) at Tono Geoscience Center (TGC) is developing a geoscientific research project named Mizunami Underground Research Laboratory (MIU) project in crystalline rock environment in order to establish scientific and technological basis for geological disposal of HLW. Geoscientific research at MIU is planned to be carried out in three phases over a period of 20 years; Surface-based Investigation Phase (Phase 1), Construction Phase (Phase 2) and Operation Phase (Phase 3). Currently, the project is under the Construction Phase. This document presents the following results of the research and development performed in 2006 fiscal year, as a part of the Construction Phase based on the MIU Master Plan updated in 2002, (1) Investigation at the MIU Construction Site, (2) Construction at the MIU Construction Site, (3) Research Collaboration.

Strain measurement under loading in laser weld on austenitic stainless steel using high-energy synchrotron radiation

Matsumoto, Keisuke*; Shobu, Takahisa; Akiniwa, Yoshiaki*; Yagi, Tsuyoshi*; Yamamoto, Masataka*

Zairyo, 57(7), p.654 - 659, 2008/07

https://doi.org/10.2472/jsms.57.654

Growth of -FeSi thin films on -FeSi (110) substrates by molecular beam epitaxy

Muroga, Masataka*; Suzuki, Hirokazu*; Udono, Haruhiko*; Kikuma, Isao*; Zhuravlev, A. V.; Yamaguchi, Kenji; Yamamoto, Hiroyuki; Terai, Takayuki*

Thin Solid Films, 515(22), p.8197 - 8200, 2007/08

https://doi.org/10.1016/j.tsf.2007.02.040

Semiconducting -FeSi has received much attention as a material for Si-based optoelectronic devices. There are a number of studies on heteroepitaxy of -FeSi film on Si. However, growth experiments of -FeSi film on single crystalline -FeSi substrate have not been investigated yet. Recently, single crystalline -FeSi with large growth facets by solution growth method using Ga solvent. By obtaining a smooth surface on the substrate, we have succeeded in growing -FeSi film on -FeSi(110) substrate using molecular-beam epitaxy.

Review on JMTR safety design for LEU core conversion

; Miyazawa, Masataka; ; ; *; Yamamoto, Katsumune; Oyamada, Rokuro; Saito, Minoru

JAERI-M 93-227, 73 Pages, 1993/12

JAERI-M-93-227.pdf:2.58MB

no abstracts in English

Thermal preannealing of single crystalline -FeSi substrate for MBE

Ouchi, Shinji*; Muroga, Masataka*; Udono, Haruhiko*; Yamada, Yoichi; Yamamoto, Hiroyuki; Kikuma, Isao*

no journal, , 

Thermal preannealing of single crystalline -FeSi substrate for MBE has been investigated to obtain better substrate for homo-epitaxial growth of -FeSi film.

Evaluation of fatigue damage around the weld zones of railway carbody structures using high-energy synchrotron radiation

Shobu, Takahisa; Matsumoto, Keisuke*; Yamamoto, Masataka*; Yagi, Tsuyoshi*; Okino, Tomohiro*

no journal, , 

no abstracts in English

Observations of living cells by use of a soft X-ray microscope and direct comparison of cell images obtained with a fluorescence microscope and a soft X-ray microscope

Ishino, Masahiko; Kado, Masataka; Kishimoto, Maki; Nishikino, Masaharu; Hasegawa, Noboru; Oba, Toshiyuki; Kawachi, Tetsuya; Tamotsu, Satoshi*; Yasuda, Keiko*; Yamamoto, Yoshimasa*; et al.

no journal, , 

no abstracts in English