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Journal Articles

MIRS: an imaging spectrometer for the MMX mission

Barucci, M. A.*; Reess, J.-M.*; Bernardi, P.*; Doressoundiram, A.*; Fornasier, S.*; Le Du, M.*; Iwata, Takahiro*; Nakagawa, Hiromu*; Nakamura, Tomoki*; Andr$'e$, Y.*; et al.

Earth, Planets and Space (Internet), 73(1), p.211_1 - 211_28, 2021/12

 Times Cited Count:8 Percentile:81.82(Geosciences, Multidisciplinary)

The MMX InfraRed Spectrometer (MIRS) is an imaging spectrometer on board of MMX JAXA mission. MIRS is built at LESIA-Paris Observatory in collaboration with four other French laboratories, collaboration and financial support of CNES and close collaboration with JAXA and MELCO. The instrument is designed to fully accomplish MMX's scientific and measurement objectives. MIRS will remotely provide near-infrared spectral maps of Phobos and Deimos containing compositional diagnostic spectral features that will be used to analyze the surface composition and to support the sampling site selection. MIRS will also study Mars atmosphere, in particular to spatial and temporal changes such as clouds, dust and water vapor.

Journal Articles

${it In situ}$ WB-STEM observation of dislocation loop behavior in reactor pressure vessel steel during post-irradiation annealing

Du, Y.*; Yoshida, Kenta*; Shimada, Yusuke*; Toyama, Takeshi*; Inoue, Koji*; Arakawa, Kazuto*; Suzudo, Tomoaki; Milan, K. J.*; Gerard, R.*; Onuki, Somei*; et al.

Materialia, 12, p.100778_1 - 100778_10, 2020/08

In order to ensure the integrity of the reactor pressure vessel in the long term, it is necessary to understand the effects of irradiation on the materials. In this study, irradiation-induced dislocation loops were observed in neutron-irradiated reactor pressure vessel specimens during annealing using our newly developed WB-STEM. It was confirmed that the proportion of $$<100>$$ loops increased with increasing annealing temperature. We also succeeded in observing the phenomenon that two $$frac{1}{2}$$$$<111>$$ loops collide into a $$<100>$$ loop. Moreover, a phenomenon in which dislocation loops decorate dislocations was also observed, and the mechanism was successfully explained by molecular dynamics simulation.

Journal Articles

Observation of magnetoelastic effects in a quasi-one-dimensional spiral magnet

Wang, C.*; Daiwei, Y.*; Liu, X.*; Chen, R.*; Du, X.*; Hu, B.*; Wang, L.*; Iida, Kazuki*; Kamazawa, Kazuya*; Wakimoto, Shuichi; et al.

Physical Review B, 96(8), p.085111_1 - 085111_5, 2017/08

AA2017-0274.pdf:1.02MB

 Times Cited Count:7 Percentile:35.8(Materials Science, Multidisciplinary)

Journal Articles

Quantum error correction in a solid-state hybrid spin register

Waldherr, G.*; Wang, Y.*; Zaiser, S.*; Jamali, M.*; Schulte-Herbr$"u$ggen, T.*; Abe, Hiroshi; Oshima, Takeshi; Isoya, Junichi*; Du, J. F.*; Neumann, P.*; et al.

Nature, 506(7487), p.204 - 207, 2014/02

 Times Cited Count:401 Percentile:99.62(Multidisciplinary Sciences)

no abstracts in English

Oral presentation

In-situ weak-beam scanning transmission electron microscopy for quantitative dislocation analysis in nuclear materials during post-irradiation annealing

Yoshida, Kenta*; Du, Y.*; Shimada, Yusuke*; Suzudo, Tomoaki; Toyama, Takeshi*; Inoue, Koji*; Arakawa, Kazuto*; Milan, K. J.*; Gerard, R.*; Nagai, Yasuyoshi*

no journal, , 

We developed a weak-beam scanning transmission electron microscopy (WB-STEM) by installing a novel beam selector, annular detector, a high-speed CCD camera and imaging filter in a camera chamber of an aberration corrected electron microscope. In-situ observation confirmed that the newly-developed WB-STEM has improved the ability to observe the dynamic behavior of dislocation loops. In addition, we performed a numerical simulation of dislocation loop behavior using molecular dynamics, and confirmed that the experimental results were well explained by the theoretical analysis. Therefore, this WB-STEM is expected to be useful for understanding the embrittlement mechanism of nuclear materials such as reactor pressure vessel (RPV) steels.

Oral presentation

Element and microstructure analysis of the molten corium-concrete products for estimating Fukushima Daiichi Nuclear Power Plant condition

Liu, P.*; Du, Y.*; Yoshida, Kenta*; Kitagaki, Toru; Ikeda, Atsushi; Shimada, Yusuke*; Nagai, Yasuyoshi*

no journal, , 

Oral presentation

3D-AP analysis of oxide particles in ODS steel irradiated to 158 dpa at JOYO

Toyama, Takeshi*; Shibahara, Rie*; Du, Y.*; Inoue, Koji*; Nagai, Yasuyoshi*; Yano, Yasuhide; Otsuka, Satoshi; Mitsuhara, Masatoshi*; Nakashima, Hideharu*; Onuma, Masato*

no journal, , 

no abstracts in English

Oral presentation

Nanocluster evolution in 9Cr ODS steel after high-dose neutron irradiation in Joyo

Du, Y.*; Toyama, Takeshi*; Inoue, Koji*; Otsuka, Satoshi; Yano, Yasuhide; Yoshida, Kenta*; Shimada, Yusuke*; Onuma, Masato*; Mitsuhara, Masatoshi*; Nakashima, Hideharu*; et al.

no journal, , 

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