Zobrazeno 1 - 10
of 454
pro vyhledávání: '"Noriyasu Ohno"'
Publikováno v:
Scientific Reports, Vol 14, Iss 1, Pp 1-8 (2024)
Abstract Detached plasma formation is a way to reduce the heat load on the wall in magnetic fusion devices. This study proposes a novel analysis technique consisting of the conditional averaging, sliding window, and tomography to reveal the spatiotem
Externí odkaz:
https://doaj.org/article/a59d5f89c3ab4ca8974147ce4b2bcad9
Publikováno v:
Plasma, Vol 7, Iss 1, Pp 160-177 (2024)
Plasma-driven science is defined as the artificial control of physical plasma-driven phenomena based on complex interactions between nonequilibrium open systems. Recently, peculiar phenomena related to physical plasma have been discovered in plasma b
Externí odkaz:
https://doaj.org/article/6de1109ed7c341029c3ac38793672f65
Publikováno v:
Nuclear Materials and Energy, Vol 39, Iss , Pp 101668- (2024)
The tungsten (W) fuzzy structure was widely observed in linear plasma devices under the fusion-relevant condition. This type of structure can be used in many application fields benefiting from its larger surface area and high optical absorbance. Howe
Externí odkaz:
https://doaj.org/article/4eb9137d3eb648f5a950934ffbe01286
Publikováno v:
Scientific Reports, Vol 13, Iss 1, Pp 1-12 (2023)
Abstract When tungsten (W) is deposited with helium (He) plasma (He–W co-deposition) on W surface, enhanced growth of fiberform nanostructure (fuzz) occurs, and sometimes it grows into large-scale fuzzy nanostructures (LFNs) thicker than 0.1 mm. In
Externí odkaz:
https://doaj.org/article/702b3ca9121b4c5ca88551dcae54c28e
Publikováno v:
Nuclear Fusion, Vol 64, Iss 5, p 056008 (2024)
ZrC dispersion-strengthened W exhibits high strength/ductility, low ductile-to-brittle transition temperature, and excellent thermal shock resistance, making it a promising candidate plasma-facing material for future fusion devices. In this study, su
Externí odkaz:
https://doaj.org/article/8ccf5983245f41a4aeaad56d336acaa2
Autor:
Shin Kajita, Tomoki Eda, Shuangyuan Feng, Hirohiko Tanaka, Anja Bieberle-Hütter, Noriyasu Ohno
Publikováno v:
Advanced Energy & Sustainability Research, Vol 4, Iss 3, Pp n/a-n/a (2023)
Helium (He) plasma treatment can be a versatile tool to fabricate nanostructures on a surface and change the surface chemistry. Herein, vanadium (V) thin film is exposed to helium plasmas and the changes in morphology and surface properties are inves
Externí odkaz:
https://doaj.org/article/c2aba3d1801342ea8a3f9ad04a6fb363
Autor:
Shin Kajita, Sho Iwai, Hirohiko Tanaka, Daisuke Nishijima, Keisuke Fujii, Hennie van der Meiden, Noriyasu Ohno
Publikováno v:
Nuclear Materials and Energy, Vol 33, Iss , Pp 101281- (2022)
Optical emission spectroscopy (OES) of helium (He) line intensities has been used to measure the electron density, ne, and temperature, Te, in various plasma devices. In this study, a neural network with five hidden layers is introduced to model the
Externí odkaz:
https://doaj.org/article/489ee45854dd4e0e90613d7ee6f743c4
Autor:
Hiroki Natsume, Kunpei Nojiri, Shin Kajita, Makoto Fukuda, Tomohiko Ushiki, Hirohiko Tanaka, Tatsuo Sugie, Sin-iti Kitazawa, Takanori Kikuchi, Tomohiro Yokozuka, Noriyasu Ohno, Koichiro Ezato, Takaki Hatae
Publikováno v:
Nuclear Materials and Energy, Vol 33, Iss , Pp 101243- (2022)
The bidirectional reflectance distribution function (BRDF) of recrystallized tungsten mono-blocks exposed to cyclic heat loading for ITER divertor outer vertical target was measured using a goniophotometer at a wavelength of 473 nm. Laser microscope
Externí odkaz:
https://doaj.org/article/48d3116edc9a485591bfa2a2aa390943
Autor:
Rongshi Zhang, Shin Kajita, Dogyun Hwangbo, Dmitry Sinelnikov, Hirohiko Tanaka, Noriyasu Ohno
Publikováno v:
Nuclear Materials and Energy, Vol 31, Iss , Pp 101178- (2022)
Nano-tendril bundles (NTBs) are known to be formed on tungsten by helium plasma exposure with additional neon impurity gas. In this study, the annealing experiments were conducted at the sample temperature of 1473 – 1673 K to investigate the change
Externí odkaz:
https://doaj.org/article/77048da5fb904ce6b970fd8a08bc36fa
Publikováno v:
Nuclear Fusion, Vol 63, Iss 4, p 049501 (2023)
Externí odkaz:
https://doaj.org/article/cd818f28f2ef42efbdb2006ee36191a5