Spin-polarized Weyl cones and giant anomalous Nernst effect in ferromagnetic Heusler films

Sumida, Kazuki; Sakuraba, Yuya*; Masuda, Keisuke*; Kono, Takashi*; Kakoki, Masaaki*; Goto, Kazuki*; Zhou, W.*; Miyamoto, Koji*; Miura, Yoshio*; Okuda, Taichi*; et al.

Communications Materials (Internet), 1, p.89_1 - 89_9, 2020/11

https://doi.org/10.1038/s43246-020-00088-w

Hydrogen isotope retentions and erosion/deposition profiles in the first wall of JT-60U

Oya, Yasuhisa*; Hirohata, Yuko*; Nakahata, Toshihiko*; Suda, Taichi*; Yoshida, Masashi*; Arai, Takashi; Masaki, Kei; Okuno, Kenji*; Tanabe, Tetsuo*

Fusion Science and Technology, 52(3), p.554 - 558, 2007/10

https://doi.org/10.13182/FST07-A1547

To investigate retention characteristics of hydrogen isotopes in the first wall tiles of JT-60U, surface morphology, erosion/deposition profiles and hydrogen isotope retentions were examined by SEM, XPS, TDS and SIMS. It was found that poloidal deuterium retention profile was rather uniform, while the thermal desorption behavior of deuterium was quite different depending on the locations of the tiles. Deuterium retained in the upper first wall, where was covered by thick boron layers with high concentration of B, was desorbed at lower temperature than that in the lower area covered by carbon layers with much less B content. D/H ratio in the first wall tiles was appreciably higher than that observed in the divertor tiles, suggesting the injection of high energy deuteron originating from NBI into the first wall. In addition, the lower temperature of the first wall compared to that of the divertor tiles would prohibit desorption of the implanted deuterium and/or its replacement by subsequent D or H impingement.

Radiation safety design for the J-PARC project

Nakashima, Hiroshi; Nakane, Yoshihiro; Masukawa, Fumihiro; Matsuda, Norihiro; Oguri, Tomomi*; Nakano, Hideo*; Sasamoto, Nobuo*; Shibata, Tokushi*; Suzuki, Takenori*; Miura, Taichi*; et al.

Radiation Protection Dosimetry, 115(1-4), p.564 - 568, 2005/12

https://doi.org/10.1093/rpd/nci237

The High Intensity Proton Accelerator Project, named as J-PARC, is in progress, aiming at studies on the latest basic science and the advancing nuclear technology. In the project, the high-energy proton accelerator complex of the world highest intensity is under construction. In order to establish a reasonable shielding design, both simplified and detailed design methods were used in the shielding design of J-PARC. This paper reviews the present status of the radiation safety design study for J-PARC.

Study for the behavior of tritiated water vapor on the organic materials

Kobayashi, Kazuhiro; Hayashi, Takumi; Igarashi, Emi*; Suda, Taichi*; Oya, Yasuhisa*; Yamanishi, Toshihiko; Okuno, Kenji*

no journal, , 

no abstracts in English

Hydrogen isotope transfer behavior on water-metal boundary using pure tritium, 1

Hayashi, Takumi; Nakamura, Hirofumi; Isobe, Kanetsugu; Kobayashi, Kazuhiro; Yamanishi, Toshihiko; Suda, Taichi*; Okuno, Kenji*

no journal, , 

no abstracts in English

Radiation safety aspects in J-PARC facility

Shibata, Tokushi; Nakashima, Hiroshi; Nakane, Yoshihiro; Masukawa, Fumihiro; Matsuda, Norihiro; Miura, Taichi*; Numajiri, Masaharu*; Suzuki, Takenori*; Takeuchi, Yasunori*

no journal, , 

J-PARC (Japan Proton Accelerator Research Complex) consists of a 400 MeV LINAC, a 3 GeV synchrotron, a 50 GeV synchrotron and three experimental halls for material and life science, hadron physics and neutrino physics. The radiation safety design for J-PARC is based on calculations on radiation outside the shielding, on the boundary of the controlled area and on the cite boundary. In order to study the accuracy of different methods and make clear the differences among different methods, some benchmark analyses on beam dump, bulk shielding, streaming and activation experiments were carried out. The activation of air, cooling water and the activation of soil and its effect to underground water have been also estimated. Since J-PARC is a complex accelerator facility, an interlock system is important for radiation safety. To prevent unintended radiation exposure, a carefully designed system was incorporated.

Laser assisted thoracic surgery for the tiny nodule in the lung

Furumoto, Hideyuki*; Usuda, Jitsuo*; Maehara, Sachio*; Imai, Kentaro*; Ishizumi, Taichiro*; Honda, Hidetoshi*; Oka, Kiyoshi; Kajiwara, Naohiro*; Ohira, Tatsuo*; Ikeda, Norihiko*

no journal, , 

no abstracts in English

Summary of reports on environmental radioactivity effected from the accident at the TEPCO Fukushima Daiichi Nuclear Power Plant

Bessho, Kotaro*; Matsumura, Hiroshi*; Miura, Taichi*; Iimoto, Takeshi*; Kinoshita, Norikazu*; Sakaguchi, Aya*; Sugihara, Shinji*; Takamiya, Koichi*; Tagami, Keiko*; Nagao, Seiya*; et al.

no journal, , 

Workshop on Environmental Radioactivity was established in 2000 and has been held every year on February or March at KEK, Tsukuba. The proceedings with peer review has been published after every workshop. After the accident at the TEPCO Fukushima Daiichi Nuclear Power Plant occurred in 2011, large number of scientific reports related to the accident were presented in this workshop. Researchers, technicians, local government staff, and general citizens have participated in the workshop to exchange information on various subjects. The organizing members of the workshop summarized 326 reports in the workshop during 2012 to 2016 and related publications. The summary report was published as follows. KEK Report 2016-3 (ISBN978-4-9907232-9-3)

Observation of spin-polarized Weyl cones and giant anomalous Nernst effect in ferromagnetic CoMnGa films

Sumida, Kazuki; Sakuraba, Yuya*; Masuda, Keisuke*; Kono, Takashi*; Kakoki, Masaaki*; Goto, Kazuki*; Zhou, W.*; Miyamoto, Koji*; Miura, Yoshio*; Okuda, Taichi*; et al.

no journal, , 

no abstracts in English

Observation of temperature dependence of spin-polarized electronic structure in CoMnSi Heusler alloy films

Sumida, Kazuki; Kakoki, Masaaki*; Sakuraba, Yuya*; Masuda, Keisuke*; Kono, Takashi*; Goto, Kazuki*; Miyamoto, Koji*; Miura, Yoshio*; Hono, Kazuhiro*; Okuda, Taichi*; et al.

no journal, , 

no abstracts in English