Zobrazeno 1 - 10
of 30
pro vyhledávání: '"Arimichi Takayama"'
Publikováno v:
Nuclear Materials and Energy, Vol 42, Iss , Pp 101836- (2025)
The neutralization of an ion particle on a surface is a key issue in plasma–wall interactions. We investigated helium ion injection onto a tungsten surface using time-dependent density functional theory (TDDFT) simulations. We developed the TDDFT c
Externí odkaz:
https://doaj.org/article/a9657f5754c141b5a58eebbd642b7534
Publikováno v:
Materials Research Express, Vol 10, Iss 12, p 125002 (2023)
The formation mechanism of fibrous tungsten nanostructures, fuzz, induced by helium plasma irradiation on tungsten materials has been investigated. We have developed a BCA-MD-KMC hybrid simulation, which solves the injection process of helium atoms b
Externí odkaz:
https://doaj.org/article/e9a52253cfb04ca882186c6da4bedc4b
Publikováno v:
Nuclear Materials and Energy, Vol 12, Iss , Pp 353-360 (2017)
The diffusion process of hydrogen and helium in plasma-facing material depends on the grain boundary structures. Whether a grain boundary accelerates or limits the diffusion speed of these impurity atoms is not well understood. In the present work, w
Externí odkaz:
https://doaj.org/article/ad438f3bb4624446a59d1e870cf113d6
Publikováno v:
Japanese Journal of Applied Physics.
Although binary collision approximation (BCA) and molecular dynamics (MD) are well used for plasma-material interaction simulation, the atomic collision in the energy above 10 eV is often out of scope in general potential model for MD. For BCA, the Z
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::050d94ae414a1354edaba25b5658ebe3
https://doi.org/10.35848/1347-4065/acd4c9
https://doi.org/10.35848/1347-4065/acd4c9
Publikováno v:
Nuclear Materials and Energy, Vol 12, Iss, Pp 353-360 (2017)
The diffusion process of hydrogen and helium in plasma-facing material depends on the grain boundary structures. Whether a grain boundary accelerates or limits the diffusion speed of these impurity atoms is not well understood. In the present work, w
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::87d1dfcf44b4deca5f6c22c7e12660a6
http://www.sciencedirect.com/science/article/pii/S2352179116302198
http://www.sciencedirect.com/science/article/pii/S2352179116302198
Autor:
Osamu Watanabe, Arimichi Takayama, Shubham Tyagi, Vijendra Singh, Shashank S. Singh, Atsushi Ito
Publikováno v:
Plasma and Fusion Research. 15:1203085-1203085
We rapidly report the benchmark of density functional theory simulation on the Plasma Simulator composed of vector processor. The improved OpenMX code on the SX-Aurora TSUBASA of the vector processor achieved performance higher than the Intel Xeon Go
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::c8b879fce57cb636bb7d42f9eae788c7
https://doi.org/10.1585/pfr.15.1203085
https://doi.org/10.1585/pfr.15.1203085
Autor:
Arimichi Takayama, Mitsutaka Miyamoto, Tatsunori Hattori, Ryo Kobayashi, Yasuyuki Noiri, Shin Kajita, Shuji Ogata, Takahiro Murashima, Hiroaki Nakamura, Yoshihide Yoshimoto, Seiki Saito, Y. Oda, Tomoyuki Tamura, Noriyasu Ohno, Atsushi Ito, Miyuki Yajima, Shuichi Takamura
Publikováno v:
Journal of Nuclear Materials. 463:109-115
The generation of tungsten fuzzy nanostructure by exposure to helium plasma is one of the important problems for the use of tungsten material as divertor plates in nuclear fusion reactors. In the present paper, the formation mechanisms of the helium
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::615a3b5b9c53a1a3038a0afb3162c0ee
https://doi.org/10.1016/j.jnucmat.2015.01.018
https://doi.org/10.1016/j.jnucmat.2015.01.018
Publikováno v:
Journal of Nuclear Materials. 438:S895-S898
To reveal the possibility of fuzz formation of tungsten material under noble gas irradiation, helium, neon, and argon atom injections into tungsten materials are performed by binary-collision-approximation-based simulation. The penetration depth is s
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::8969292bef8fff6469bae898f5cebb30
https://doi.org/10.1016/j.jnucmat.2013.01.194
https://doi.org/10.1016/j.jnucmat.2013.01.194
Publikováno v:
Progress in Nuclear Science and Technology. 2:44-50
Our group has been developing a hybrid simulation of the molecular dynamics (MD) and the binary collision approximation (BCA) simulation. One of the main problems of this hybridization model is that the multi-body potential suddenly appears at the mo
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::fe696476edf707c58b655471a15dcc62
https://doi.org/10.15669/pnst.2.44
https://doi.org/10.15669/pnst.2.44
Publikováno v:
Journal of Nuclear Materials. 415:S208-S211
Molecular dynamics (MD) simulation with modified Brenner's reactive empirical bond order (REBO) potential is a powerful tool to investigate plasma wall interaction on divertor plates in a nuclear fusion device. However, MD simulation box's size is le
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::4cc6794bc5e8b45e0abbad5bdeb00758
https://doi.org/10.1016/j.jnucmat.2010.12.233
https://doi.org/10.1016/j.jnucmat.2010.12.233