Faculty Profiles - OHNO, Noriyasu

Papers - OHNO, Noriyasu

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Influence of Deuterium Retention on Secondary Electron Emission from Graphite under Deuterium Plasma Exposure Reviewed

T.Kaneko, N.Ohno, Y.Nakamura, M.Yamagiwa, N.Matsunami, S.Kajita, M.Takagi

Plasma and Fusion Research Vol. 10 page： 1402009(5 pp) 2015

Arc spot grouping: An entanglement of arc spot cells Reviewed Open Access

S.Kajita, D.Hwangbo, N.Ohno, M.M.Tsventoukh, S.A.Barengolts

Journal of Applied Physics Vol. 116 page： 233302 2014.12

Current Activities in the Interactive Joint Research at Tohoku University - Advanced Evaluation of Radiation Effects on Fusion Materials - Reviewed

H.Kurishita, M.Hatakeyama, M.Narui, S.Matsuo, T.Shikama, K.Tada, N.Ohno, T.Takeuchi, Y.Hatano, M.Nishiura, Y.Nakashima, H.Watanabe, K.Tokunaga, T.Hino, Y.Ueda, T.Muroga, A.Sagara, O.Kaneko

Plasma and Fusion Research Vol. 9 page： 3405136（4 pp) 2014.9

Compact and high-particle-flux thermal-lithium-beam probe system for measurement of two-dimensional electron density profile Reviewed

Y.Shibata, T.Manabe, S.Kajita, N.Ohno, M.Takagi, H.Tsuchiya, T.Morisaki

Rev. Sci. Instrum. Vol. 85 page： 93510(6 pp) 2014.9

Application of Nanostructured Tungsten Fabricated by Helium Plasma Irradiation for Photoinduced Decolorization of Methylene Blue Reviewed Open Access

K.Komori, T.Yoshida, S.Yagi, H.Yoshida, M.Yajima, S.Kajita, N.Ohno

e-J.Surf.Sci.Nanotech.(e-Journal of Surface Science and Nanotechnology) Vol. 12 page： 343-348 2014.7

Fractality of self-grown nanostructured tungsten by He plasma irradiation Reviewed

S.Kajita, Y.Tsuji, N.Ohno

Physics Letters A Vol. 378 page： 2533-2538 2014.7

In situ observation of structural change of nanostructured tungsten during annealing Reviewed

M.Yajima, N.Yoshida, S.Kajita, M.Tokitani, T.Baba, N.Ohno

Journal of Nuclear Materials Vol. 449 ( 1-3 ) page： 9-14 2014.6

Influence of plasma-neutral collisions on probe measurements in atmospheric pressure plasmas Reviewed International journal

Contributions to Plasma Physics Vol. 54 ( 3 ) page： 304 - 307 2014.4

In situ measurement of deuterium retention in graphite under successive exposure to deuterium and hydrogen plasmas Reviewed

N.Ohno, Y.Nakamura, M.Yamagiwa, T.Kaneko, N.Matsunami, S.Kajita, M.Takagi

Phys. Scr. Vol. T159 page： 014053(4 pp) 2014.4

A plasma source driven predator-prey like mechanism as a potential cause of spiraling intermittencies in linear plasma devices Reviewed

D.Reiser, N.Ohno, H.Tanaka, L.Vela

Physics of Plasmas Vol. 21 page： 032302(10 pp) 2014.3

Surface modification of titanium using He plasma Reviewed

S.Kajita, D.Kitaoka, N.Ohno, R.Yoshihara, N.Yoshida, T.Yoshida

Applied Surface Science Vol. 303 page： 438-445 2014.3

Thermal response of nanostructured tungsten Reviewed

S.Kajita, G.De Temmerman, T.Morgan, S.van Eden, T. de Kruif, N.Ohno

Nuclear Fusion Vol. 54 page： 033005(10 pp) 2014.2

Helium plasma irradiation on single crystal tungsten and undersized atom doped tungsten alloys Reviewed International journal

Shin Kajita, Naoaki Yoshida, Noriyasu Ohno, Yuki Hirahata, Reiko Yoshihara

PHYSICA SCRIPTA Vol. 89 ( 2 ) 2014.2

Language：English Publishing type：Research paper (scientific journal) Publisher：IOP PUBLISHING LTD

Helium plasma irradiation leads to the formation of nanostructures on the surface when certain conditions are satisfied. The surface morphology changes due to helium plasma irradiation were investigated on single crystal tungsten samples with different crystal orientations. Differences in surface morphology changes were observed in (100) and (110) single crystal tungsten samples when the helium fluence was less than 10(25) m(-2). However, the differences disappeared as growth proceeded. Tungsten alloys were prepared in order to investigate the influence of the additional undersized atomic species on nanostructure growth. The influence of the doping of undersized atoms, i.e. 2 at% Fe doped and 2 at% Cr doped atoms, is presented.

DOI： 10.1088/0031-8949/89/02/025602

Web of Science

Scopus

Optical design for divertor Thomson scattering system for JT-60SA Reviewed

S.Kajita, A.Enokuchi, T.Hatae, K.Itami, T.Hamano, S.Kado, N.Ohno, N.Takeyama

Fusion Engineering and Design Vol. 89 ( 1 ) page： 69-76 2014.1

Helium plasma irradiation on single crystal tungsten and undersized atom doped tunsten alloys Reviewed

S.Kajita, N.Yoshida, N.Ohno, Y.Hirahata, R.Yoshihara

Phys. Scr. Vol. 89 page： 025602(7 pp) 2014.1

Modified Power Transmission Factor of Tungsten in Plasmas with Hot Electron Component Reviewed

S.Takamura, S.Ono, N.Ohno

Contrib. Plasma Phys. Vol. 54 ( 4-6 ) page： 474-478 2014

Transition in velocity and grouping of arc spot on different nanostructured tungsten electrodes Reviewed Open Access

Dogyun Hwangbo, Shin Kajita, Sergey A. Barengolts, Mikhail M. Tsventoukh, Noriyasu Ohno

RESULTS IN PHYSICS Vol. 4 page： 33 - 39 2014

Language：English Publishing type：Research paper (scientific journal) Publisher：ELSEVIER SCIENCE BV

Behavior of arc spots was investigated in detail using a nanostructured tungsten specimen with different thicknesses of the nanostructured layer. From the observation using a fast framing camera, it was found that the velocity of the arc spots significantly altered as passing the boundary of the two layers. The changes in spot velocity and spot width were discussed theoretically using the ecton model. The fractal dimension of the arc trail evaluated by using a box-counting method was significantly changed. Also, the width of arc trail was increased with the nanostructured layer thickness. From the SEM analysis of the specimen, the amount of tungsten eroded by arcing for two different thickness cases was estimated, and the erosion rates were discussed. (C) 2014 The Authors. Published by Elsevier B.V.

DOI： 10.1016/j.rinp.2014.03.001

Open Access

Web of Science

Scopus

Spectroscopic Study and Motion Analysis of Arc Spot Initiated on Nanostructured Tungsten Reviewed

D.Hwangbo, S.Kajita, M.Osaka, N.Ohno

Jpn. J. Appl. Phys. Vol. 52 page： 11NC02(6 pp) 2013.11

Low-energy helium irradiation on in-vessel mirror materials Reviewed

S.Kajita, M.Tokitani, T.Saeki, N.Ohno, N.Yoshida

Journal of Nuclear Materials Vol. 442 ( 1-3, Supplement 1 ) page： S515-S519 2013.11

Helium effects on tungsten surface morphology and deuterium retention Reviewed

Y.Ueda, H.Y.Peng, H.T.Lee, N.Ohno, S.Kajita, N.Yoshida, R.Doerner, G.De Temmerman, V.Alimov, G.Wright

Journal of Nuclear Materials Vol. 442 ( 1-3 ) page： S267-S272 2013.11

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Papers - OHNO, Noriyasu