Faculty Profiles - OHNO, Noriyasu

Papers - OHNO, Noriyasu

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Neutral helium line emission for edge plasma conditions Reviewed

F.B.Rosmej, R.Stamm, S.Fritzsche, H.Capes, M.Koubiti, Y.Marandet, V.S.Lisitsa, N.Ohno, S.Takamura, D.Nishijima

Journal of Nuclear Materials Vol. 337-339 page： 1101-1105 2005

Formation mechanism of bubbles and holes on tungsten surface with low-energy and high-flux helium plasma irradiation in NAGDIS-II Reviewed

Dai. Nishijima, M.Y.Ye, N.Ohno, S.Takamura

J. Nucl. Mater. Vol. 329-333 page： 1029-1033 2005

Characterstic changes of deuterium rentention on tungsten surfaces due to low-energy helium plasma pre-exposure Reviewed

D.Nishijima, T.Sugimoto, H.Iwakiri, M.Y.Ye, N.Ohno, N.Yoshida, S.Takamura

Journal of Nuclear Materials Vol. 337-339 page： 927-931 2005

Overview of JT-60U progress towards steady-state advanced tokamak Reviewed

S.Ide, N.Ohno, JT-60U Team

Nuclear Fusion Vol. 45 page： S48-S62 2005

Micron-Bubble Formation on Polycrystal Tungsten due to Low-Energy and high-Flux Helium Plasma Exposure Reviewed Open Access

D.Nishijima, M.Miyamoto, H.Iwakiri, M.Ye, N.Ohno, K.Tokunaga, N.Yoshida, S.Takamura

Nuclear Fusion Vol. 46 page： 561-564 2005

Further Roughing of Tungsten Surface due to Transient Heat Load by Laser Irradiation during Helium Plasma Exposure Reviewed

S.Kajita, D.Nishijima, N.Ohno, S.Takamura

J. Plasma Fusion Res. Vol. 81 page： 745-746 2005

High-Z Dust Generation on Tungsten Surface due to Synergetic Erosion of Deuterium/Helium Plasma Exposure Reviewed

D.Nishijima, K.Amano, N.Ohno, N.Yoshida, S.Takamura

J. Plasma Fusion Res. Vol. 81 page： 703-707 2005

Suppression of Blister Formation and Deuterium Retention on Tungsten Surface due to Mechanical Polishing and Helium Pre-exposure Reviewed

D.Nishijima, H.Iwakiri, K.Amano, M.Y.Ye, N.Ohno, K.Tokunaga, N.Yoshida, S.Takamura

Nucl. Fusion Vol. 45 page： 669-674 2005

Efficient Radio Frequency Inductive Discharge in Hear Atmospheric Pressure Using Imittance Conversion Topology Reviewed

M.A.Razzak, S.Takamura, Y.Uesugi, N.Ohno

J. Plasma Fusion Res. Vol. 81 ( 3 ) page： 204-211 2005

Transition from electrostatic-to-electromagnetic mode in a radio-frequency Ar inductively coupled plasma in atmospheric pressure Reviewed International journal

Razzak MA, Kondo K, Uesugi Y, Ohno N, Takamura S

JOURNAL OF APPLIED PHYSICS Vol. 95 ( 2 ) page： 427 - 433 2004.1

Proposal of Modeified Child-Langmuir Formula Describing Space-Charge Limited Current in Plasma Reviewed

Y.Hagino, N.Ohno, S.Takamura

Contrib. Plasma Phys. Vol. 44 ( 1-3 ) page： 144-149 2004

Visualization of Intermittent Blobby Plasma Transport in Attached and Detached Plasmas of the NAGDIS-II Reviewed

N.Ohno, K.Furuta, S.Takamura

J. Plasma Fusion Res. Vol. 80 ( 4 ) page： 275-276 2004

Moving-Surface Plasma-Facing Components for Particle Control in Steady State Magnetic Fusion Devices Reviewed

Y.Hirooka, H.Fukushima, N.Ohno, S.Takamura

Fusion Science and Technology Vol. 45 page： 60-64 2004

Reconstruction of Velocity Distribution of density Bursts by Wavelet Analysis in the Linear Divertor Simulator NAGDIS-II Reviewed

N.Ohno, V.P.Budaev, K.Furuta, H.Miyoshi, S.Takamura

Contrib. Plasma Phys. Vol. 44 ( 1-3 ) page： 222-227 2004

Space-Charge Limited Current from Plasma-Facing Material Surface Reviewed

S.Takamura, N.Ohno, M.Y.Ye, T.Kuwabara

Contrib. Plasma Phys. Vol. 44 ( 1-3 ) page： 126-137 2004

Proposal of modified Child-Langmuir formula describing space-charge limited current in plasma Reviewed International journal

Hagino Y, Ohno N, Takamura S

CONTRIBUTIONS TO PLASMA PHYSICS Vol. 44 ( 1-3 ) page： 144 - 149 2004

Proof-of-principle experiments on the concept of moving-surface plasma-facing components - Hydrogen recycling over a titanium-gettered rotating drum Reviewed International journal

Hirooka Y., Fukushima H., Ohno N., Takamura S.

Fusion Engineering and Design Vol. 65 ( 3 SPEC. ) page： 413 - 421 2003.4

Language：English Publishing type：Research paper (scientific journal) Publisher：Fusion Engineering and Design

In the magnetic fusion community much attention has recently been directed to particle control in the existing confinement experiments, as it is recognized that the core plasma performance can directly be affected by the edge conditions. However, it is still true that there is no clear strategy to cope with the needs for steady-state reactor operation. That is that, due to the saturation nature, wall conditioning such as boronization is not applicable for fuel and impurity particles control in steady-state devices, requiring a start from enabling concepts development. As a possible solution, the concept of moving-surface plasma-facing components (MS-PFCs) was proposed in our previous work and in the present work proof-of-principle experiments have been conducted. In this concept, the plasma-facing surface is mechanically circulated out-of-pile for regeneration of particle capturing capabilities by coating getter films on it. A prototypical MS-PFC test unit has been constructed for these proof-of-principle experiments, employing a rotating copper drum as the moving surface and titanium as the getter material. It has been indicated that, from Hα light intensity data taken in front of the rotating target, relative to no getter cases, approximately 6% reduced hydrogen recycling has been achieved at steady state. In support of these data, a first-order particle balance model predicts a 7% reduction in hydrogen recycling. © 2003 Elsevier Science B.V. All rights reserved.

DOI： 10.1016/S0920-3796(03)00011-5

Scopus

Ion temperature measurement using an ion sensitive probe in the LHD divertor plasma Reviewed International journal

Ezumi N., Masuzaki S., Ohno N., Uesugi Y., Takamura S.

Journal of Nuclear Materials Vol. 313-316 ( SUPPL. ) page： 696 - 700 2003.3

Language：English Publishing type：Research paper (scientific journal) Publisher：Journal of Nuclear Materials

The first reliable measurement of ion temperature in the divertor plasma of the Large Helical Device has been done by using an ion sensitive probe. The satisfactory current-voltage characteristics of the ion collector for evaluating the ion temperature were obtained at the outer part of the divertor leg. Furthermore, simultaneous ion and electron temperature measurements were successfully done in this part. The results show that the ion temperature is higher than the electron temperature in the part. There is a possibility that the profiles of the evaluated ion temperature which shows relatively higher than the electron temperature at the outside of divertor leg are qualitatively explained by particle's orbits around the edge and divertor region. © 2003 Elsevier Science B.V. All rights reserved.

DOI： 10.1016/S0022-3115(02)01364-8

Scopus

Experimental evaluation of space charge limited emission current from tungsten surface in high density helium plasma Reviewed International journal

Hagino Y., Ohno N., Takamura S., Ye M.

Journal of Nuclear Materials Vol. 313-316 ( SUPPL. ) page： 675 - 678 2003.3

Language：English Publishing type：Research paper (scientific journal) Publisher：Journal of Nuclear Materials

The experimental evaluation of space charge limited emission current from tungsten surface in high density helium plasma was done. It was found that the space charge limited current from the tungsten target plate saturated with an increase in sheath voltage. The space charge effect was predicted on the basis of boundary conditions of zero electric field on the material surface.

DOI： 10.1016/S0022-3115(02)01381-8

Scopus

非接触再結合プラズマ中の揺動特性 Reviewed Open Access

大野哲靖、田中直行、高村秀一

Vol. 7 ( 10 ) page： 1093-1101 2003

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Papers - OHNO, Noriyasu