Faculty Profiles - OHNO, Noriyasu

Papers - OHNO, Noriyasu

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Enhancement of photocatalytic activity of TiO2 by plasma irradiation Reviewed Open Access

S.Kajita, T.Yoshida, N.Ohno, T.Ishida, D.Kitaoka

Japanese Journal of Applied Physics Vol. 55 page： 106202(5 pp) 2016.9

Plasma detachment study of high density helium plasmas in the Pilot-PSI device Reviewed

Y.Hayashi, K.Jesko, H.J.van der Meiden, J.W.M.Vernimmen, T.W.Morgan, N.Ohno, S.Kajita, M.Yoshikawa, S.Masuzaki

Nuclear Fusion Vol. 56 page： 126006(13 pp) 2016.9

Fuzzy nanostructure growth on Ta/Fe by He plasma irradiation Reviewed Open Access

S.Kajita, T.Ishida, N.Ohno, D.Hwangbo, T.Yoshida

Scientific Reports Vol. 6 page： 30380 2016.7

Statistical Analysis of Particle Flux Flowing into the End-Target in between Atached and Detached Sttes in the Linear Divertor Plasma Simulator NAGDIS-II Reviewed

H.Tanaka, N.Ohno, T.Onda, K.Takeyama, S.Kajita, T.Kuwabara, Y.Tsuji

Contrib. Plasma Phys. Vol. 56 ( 6-8 ) page： 723-728 2016.6

Measurement of thermophysical property of plasma forming tungsten nanofiber layer Reviewed

S.Kajita, T.Yagi, K.Kobayashi, M.Tokitani, N.Ohno

Japanese Journal of Applied Physics Vol. 55 page： 056203(5 pp) 2016.4

Dynamics of three-dimensional radiative structures during RMP assisted detached plasmas on the large helical device and its comparison with EMC3-EIRENE modeling Reviewed International coauthorship

Shwetang N. Pandya, Byron J. Peterson, Masahiro Kobayashi, Katsumi Ida, Kiyofumi Mukai, Ryuichi Sano, Junichi Miyazawa, Hirohiko Tanaka, Suguru Masuzaki, Tsuyoshi Akiyama, Gen Motojima, Noriyasu Ohno

NUCLEAR FUSION Vol. 56 ( 4 ) page： 046002 2016.3

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

The resonant magnetic perturbation (RMP) island introduced in the stochastic edge of the large helical device (LHD) plasma plays an important role in the stabilization of the plasma detachment (Kobayashi et al 2013 Nucl. Fusion 53 093032). The plasma enters in the sustained detachment phase in the presence of an RMP once the line averaged density exceeds a critical value with a given input power. During detachment the enhanced radiation from the stochastic edge of the LHD undergoes several spatiotemporal changes which are studied quantitatively by an infrared imaging video bolometer (IRVB) diagnostic. The experimental results are compared qualitatively and quantitatively with the radiation predicted by the 3D transport simulation with fluid model, EMC3-EIRENE. A fair amount of qualitative agreement, before and after the detachment, is reported. The issue of overestimated radiation from the model is addressed by changing the free parameters in the EMC3-EIRENE code till the total radiation and the radiation profiles match closely, within a factor of two with the experimental observations. A better quantitative match between the model and the experiment is achieved at higher cross-field impurity diffusion coefficient and lower sputtering coefficient after the detachment. In this article a comparison, the first of its kind, is established between the quantified radiation from the experiments and the synthetic image obtained from the simulation code. This exercise is aimed towards validating the model assumptions against the experimentally measured radiation.

DOI： 10.1088/0029-5515/56/4/046002

Web of Science

Scopus

Strong Reduction of Ion Flux to a Target Plate in a Magnetically Contracting Detached Plasma Reviewed

Y.Hayashi, H.Nishikata, N.Ohno, S.Kajita

Plasma and Fusion Research: Rapid Communications Vol. 11 page： 1202005(2 pp) 2016.2

Plasma flow in peripheral region of detached plasma in linear plasma device Reviewed Open Access

Y.Hayashi, N.Ohno, S.Kajita, H.Tanaka

Physics of Plasmas Vol. 23 page： 012511(7 pp) 2016.1

Arc tracks on nanostructured surfaces after microbreakdowns Reviewed Open Access

D.Sinelnikov, D.Bulgadaryan, D.Hwangbo, S.Kajita, D.Kolodko, V.Kurnaev, N.Ohno

Journal of Physics:Conference Series Vol. 748 page： 012012(6 pp) 2016

Detailed Analysis of Plasma Resistivity in Detached Recombining Plasmas Reviewed

H.Nishikata, Y.Hayashi, N.Ohno, S.Kajita, T.Kuwabara

Contrib. Plasma Phys. Vol. 56 ( 6-8 ) page： 717-722 2016

Modeling of Linear Divertor Plasma Simulator Experiments with Three-dimensional Target Structure by Using EMC3-EIRENE Code Reviewed

T.Kubawara, H.Tanaka, G.Kawamura, N.Ohno, H.Nishikata, M.Kobayashi, Y.Feng

Contrib. Plasma Phys. Vol. 56 ( 6-8 ) page： 598-603 2016

Effects of Modified Surfaces Produced at Plasma-Facing Surface on Hydrogen Isotopes and Helium Release Behavior in the LHD Reviewed

Y.Nobuta, S.Masuzaki, M.Tokitani, D.Nagata, N.Ashikawa, N.Yoshida, Y.Oya, M.Yajima, G.Motojima, H.Kasahara, M.Miyamoto, N.Ohno

IAEA proccedings page： MPT/P5-19(9 pp) 2016

Photon Trapping Effects in DEMO Divertor Plasma Reviewed

K. Hoshino, K. Sawada, R. Idei, S. Tokunaga, N. Asakura, K. Shimizu, and N. Ohno

Contrib. Plasma Phys. Vol. 56 page： 657-662 2016

Investigation of arcing on fiber-formed nanostructured tungsten by pulsed plasma during steady state plasma irradiation Reviewed

M. Yajima, N. Ohno, S. Kajita, G. De Temmerman, K. Bystrov, S. Bardin

Fusion Engineering and Design Vol. 112 page： 156-161 2016

Vacuum Breakdown from Nanostructured Fuzzy Surfaces Reviewed International coauthorship International journal

Sinelnikov D., Bulgadaryan D., Hwangbo D., Kajita S., Kolodko D., Kurnaev V., Ohno N.

PROCEEDINGS OF THE 27TH INTERNATIONAL SYMPOSIUM ON DISCHARGES AND ELECTRICAL INSULATION IN VACUUM (ISDEIV), VOL 1 page： 68 - 71 2016

Morphology and optical property changes of nanostructured tungsten in LHD Reviewed

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

Plasma and Fusion Research Vol. 10 page： 1402083(9 pp) 2015.12

Sulfur K-edge XANES for methylene blue in photocatalytic reaction over WO<inf>3</inf> nanomaterials Reviewed International journal

K. Komori, T. Yoshida, T. Nomoto, M. Yamamoto, C. Tsukada, S. Yagi, M. Yajima, S. Kajita, N. Ohno

Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms Vol. 365 page： 35 - 38 2015.12

Increase in the work function of W/WO3 by helium plasma irradiation Reviewed

S.Kajita, A.Ohta, T.Ishida, K.Makihara, T.Yoshida, N.Ohno

Japanese Journal of Applied Physics Vol. 54 page： 126201(6 pp) 2015.11

3D effects of edge magnetic field configuration on divertor/scrape-off layer transport and optimization possibilities for a future reactor Reviewed International coauthorship International journal Open Access

M. Kobayashi, Y. Xu, K. Ida, Y. Corre, Y. Feng, O. Schmitz, H. Frerichs, F. L. Tabares, T. E. Evans, J. W. Coenen, Y. Liang, A. Bader, K. Itoh, H. Yamada, Ph Ghendrih, G. Ciraolo, D. Tafalla, A. Lopez-Fraguas, H. Y. Guo, Z. Y. Cui, D. Reiter, N. Asakura, U. Wenzel, S. Morita, N. Ohno, B. J. Peterson, S. Masuzaki

Nuclear Fusion Vol. 55 ( 10 ) page： 104021 2015.9

Language：English

© 2015 IAEA, Vienna. This paper assesses the three-dimensional (3D) effects of the edge magnetic field structure on divertor/scrape-off layer transport, based on an inter-machine comparison of experimental data and on the recent progress of 3D edge transport simulation. The 3D effects are elucidated as a consequence of competition between transports parallel () and perpendicular () to the magnetic field, in open field lines cut by divertor plates, or in magnetic islands. The competition has strong impacts on divertor functions, such as determination of the divertor density regime, impurity screening and detachment control. The effects of magnetic perturbation on the edge electric field and turbulent transport are also discussed. Parameterization to measure the 3D effects on the edge transport is attempted for the individual divertor functions. Based on the suggested key parameters, an operation domain of the 3D divertor configuration is discussed for future devices.

DOI： 10.1088/0029-5515/55/10/104021

Scopus

Initiation of arcing on tungsten surface exposed to steady state He Plasmas Reviewed

S.Kajita, Y.Noiri, N.Ohno

Physica Scripta Vol. 90 ( 9 ) page： 095604(7 pp) 2015.8

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Papers - OHNO, Noriyasu