Faculty Profiles - OHNO, Noriyasu

Papers - OHNO, Noriyasu

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Alleviation of Damaged Tungsten Having Helium Holes/Bubbles by Use of Transient Heat Load Reviewed

S.Kajita, S.Takamura, N.Ohno, T.Nishimoto

Plasma Fusion Research Vol. 2 page： 9 2007

Extended Steady-state and High-beta Regimes of Net-current Free Heliotron Plasmas in the Large Helical Device Reviewed

O.Motojima, H.Yamada, A.Komori, N.Ohyabu, T.Mutoh, O.Kaneko, K.Kawahata, T.Mito, K.Ida, S.Imagawa, Y.Nagayama, T.Shimozuma, K.Y.Watanabe, S.Masuzaki, J.Miyazawa, T.Morisaki, S.Morita, S.Ohdachi, N.Ohno, K.Saito, S.Sakakibara, Y.Takeiri, N.Tamura, K.Toi, M.Tokitani, M.Yokoyama, M.Yoshinuma, K.Ikeda, A.Isayama, K.Ishii S.Kubo, S.Murakami, K.Nagasaki, T.Sekim K.Takahata, H.Takenaga and the LHD Experimental Group

Nuclear Fusion Vol. 47 page： S668-S676 2007

Plasma-surface Interaction, Scrape-off Layer and Divertor Physics: Implications for ITER Reviewed

B.Lipschultz, X.Bonnin, G.Counsell, A.Kallenbach, A.Kukushkin, K.Krieger, A.Leonard, A.Loarte, .Neu, R.A.Pitts, T.Rognlien, J.Roth, C.Skinner, J.L.Terry, E.Tsitrone, D.Whyte, S.Zweben, N.Asakura, D.Coster, R.Doerner, R.Dux, G.hendrih, A.Herrmann, J.Hu, S.Krasheninnikov, G.Kirnev, A.Kreter, V.Kurnaev, B.LaBombard, S.Lisgo, T.Nakano, N.Ohno, H.D.Pacher, J.Paley, Y.Pan, G.Pautasso, V.Philipps, V.Rohde, D.Rudakov, P.Stangeby, S.Takamura, T.Tanabe, Y.Yang, S.Zhu

Nuclear Fusion Vol. 47 page： 1189-1205 2007

High Density Plasma Generation by RF Ohmic Discharge in Toroidal Divertor Simulator NAGDIS-T Reviewed

M.Nagase, H.Masuda, N.Ohno, S.Takamura, M.Takagi

J. Nucl. Mater. Vol. 363-365 page： 611-615 2007

Dynamic Interaction between Disruptive Plasma and Wall in the Small Tokamak HYBTOK-II Reviewed

M.Okamoto, T.Yamada, T.Hiraishi, Y.Kikuchi, N.Ohno, S.Takamura

J. Nucl. Mater. Vol. 363-365 page： 1076-1080 2007

Alleviation of Helium Holes/Bubbles on Tungsten Surface by Use of Transient Heat Load Reviewed International journal

KAJITA Shin, TAKAMURA Shuichi, OHNO Noriyasu, NISHIMOTO Tentaro

Plasma and Fusion Research ( 2 ) page： 9 - 9 2007

Language：English Publishing type：Research paper (scientific journal) Publisher：社団法人プラズマ・核融合学会

The alleviation effect of transient heat load on helium holes/bubbles has been demonstrated using ruby laser pulses for the transient heat source in the divertor simulator NAGDIS-II. It is shown that the holes and bubbles disappeared following the irradiation of the ruby laser pulses, while the surface roughness was significantly enhanced by the irradiation of the Nd:YAG laser pulses. Based on the numerically calculated temperature in the specimen, the physical mechanism causing this difference is discussed particularly in terms of pulse width (0.6 ms for ruby laser without a Q-switch and 5 ns for Nd:YAG laser with a Q-switch).

DOI： 10.1585/pfr.2.009

Plasma response on penetration of external rotating helical magnetic field in HYBTOK-II tokamak edge plasma Reviewed International journal

Budaev V.P., Pankratov I.M., Takamura S., Ohno N., Kajita S., Takagi M., Matsuno H., Okamoto M., Hosoi S., Hasebe Y., Yamada T., Omelchenko A.Y., Olshansky V.V.

33rd EPS Conference on Plasma Physics 2006, EPS 2006 Vol. 2 page： 1548 - 1551 2006.12

Intermittency in laboratory and space plasmas: Comparative study of multifractal statistics Reviewed International coauthorship International journal

Budaev V., Savin S., Zelenyi L., Takamura S., Ohno N., Shevyrev N.

33rd EPS Conference on Plasma Physics 2006, EPS 2006 Vol. 1 page： 344 - 347 2006.12

Reduction of laser power threshold for melting tungsten due to subsurface helium holes Reviewed International journal

Kajita Shin, Nishijima Dai, Ohno Noriyasu, Takamura Shuichi

JOURNAL OF APPLIED PHYSICS Vol. 100 ( 10 ) 2006.11

Modification of the damping rate of the oscillations of a dust particle levitating in a plasma due to the delayed charging effect Reviewed International coauthorship International journal

Pustylnik M.Y., Ohno N., Takamura S., Smirnov R.

Physical Review E - Statistical, Nonlinear, and Soft Matter Physics Vol. 74 ( 4 ) 2006.10

Language：English Publishing type：Research paper (scientific journal) Publisher：Physical Review E - Statistical, Nonlinear, and Soft Matter Physics

Dependence of the damping rate of the oscillations of the dust particles levitating in the sheath on the plasma parameters is investigated both theoretically and experimentally. Significant deviations of the damping rate from the values predicted by the Epstein formula are found in the experiment. The delayed charging effect is applied for the theoretical explanation of the experimental results. Qualitative agreement between the theoretical and experimental data is obtained. © 2006 The American Physical Society.

DOI： 10.1103/PhysRevE.74.046402

Scopus

Superdiffusion and multifractal statistics of edge plasma turbulence in fusion devices Reviewed International coauthorship International journal

Budaev V.P., Takamura S., Ohno N., Masuzaki S.

Nuclear Fusion Vol. 46 ( 4 ) 2006.4

Language：English Publishing type：Research paper (scientific journal) Publisher：Nuclear Fusion

The edge plasma turbulence in the T-10 tokamak, the HYBTOK-II tokamak, the linear machine NAGDIS-II and the Large Helical Device have been studied. The fluctuations in the plasma density have been analysed in terms of the multifractal formalism revisited with wavelets. In most of the cases considered, the edge density fluctuations demonstrate multifractal statistics, i.e. the scaling behaviour of the absolute moments is described by a convex function with non-trivial self-similarity properties. The multifractality factor defined in the multiplicative cascade model is a relevant parameter for characterizing the edge plasma turbulence. The multiplicative cascade process has a 'coarse' time scale T ∼ 50-200 ms iterating towards finer scales. This time scale is referred to as an integral correlation scale. The self-similarity parameters have been observed to depend on the edge plasma condition. The correlation and transport properties have been analysed regarding the multifractality parameter. The diffusion transport coefficient in an edge plasma is not a trivial function of multifractality parameters. © 2006 IAEA, Vienna.

DOI： 10.1088/0029-5515/46/4/S10

Scopus

Comparison of HeI Line Intensity Ratio Method and Electrostatic Probe for Electron Density and Temperature Measurements in NAGDIS-II Reviewed

S.Kajita, N.Ohno, S.Takamura, T.Nakano

Physics of Plasmas Vol. 13 page： 013301(9pages) 2006.1

Numerical Analysis on Generation of High Density Plasmas in the Toroidal Device NAGDIS-T for SOL and Divertor Simulation Studies Reviewed

M.Nagase, S.Takamura, N.Ohno, H.Masuda, H.Kitahara, M.Takagi

Contrib. Plasma Physics Vol. 46 page： 557-562 2006

Charactersitics of rf inductive plasma in oxy-combustion

Yugo Osaka, Noriyuki Kobayashi, M.A.Razzak, Noriyasu Ohno, Shuichi Takamura

The 4th International Conference on Combustion, Incineration/Pyrolysis and Emission Control, September 26-29, 2006, Kyoto, Japan Vol. 1 2006

Fundamental research on plasma-assisted combustion by applying rf power

Yugo Osaka, Noriyuki Kobayashi, M.A.Razzak, Noriyasu Ohno, Shuichi Takamura

11th Asian Pacific Confederation of Chemical Engineering Congress, August 27-30, 2006 Kuala Lumpur, Malaysia Vol. 1 2006

Dust Formation and Transport in the Divertor Plasma Simulators

N.Ohno, M.Miyoshi, T.Yamada, M.Pustylnik, S.Kajita, S.Takamura

7th Workshop ont Fine Particle Plasma, NIFS, oki, Japan December, 15-16, 2006(招待講演) Vol. 1 2006

Two-dimensional measurement of plasma dynamics with an ICCD fast camera based on HeI line intensity ratio method

N.Yamamoto, K.Miyamoto, K.Kitagawa, S.Kajita, M.Okamoto, N.Ohno

16th International Toki Conference on Advanced Imaging and Plasma Diagnostics, Toki, Gifu, Japan, Dec. 5-8, 2006 page： 6-15 2006

Imaging of tungsten impurity ejected from damaged material due to transient heat load

S.Kajita, N.Ohno, S.Takamura

16th International Toki Conference on Advanced Imaging and Plasma Diagnostics, Toki, Gifu, Japan, Dec. 5-8, 2006 page： 4-01 2006

ELM Propagation and Fluctuations Characteristics in H- and L-mode SOL Plasmas on JT-60U

N.Asakura, N.Ohno, H.Kawashima, H.Miyoshi, G.Matsunaga, N.Oyama, S.Takamura, Y.Uesugi, M.Takechi, T.Nakano, H.Kubo

21st IAEA Fusion Energy Conference, Chengdu, China, Oct. 16-21, 2006 page： EX/9-2 2006

Integrated View of Disruption Dynamics on Internal Electromagnetic and Plasma Structures in the small tokamak HYBTOK-II

M.Okamoto, S.Takamura,N.Ohno, S.Kajita, Y.Kikuchi, Y.Uesugi, T.Ozeki, Y.Kawano, M.Sugihara

21st IAEA Fusion Energy Conference, Chengdu, China, Oct.16-21,2006 page： EX/P8-14 2006

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Papers - OHNO, Noriyasu