Faculty Profiles - OHNO, Noriyasu

Papers - OHNO, Noriyasu

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Enhancement of multi-pulse laser induced damage threshold on Cu mirror under vacuum condition Reviewed

S.Kajita, R.Yasuhara, M.Sato, N.Ohno, M.Tokitani, N.Yoshida

Optics Express Vol. 21 ( 14 ) page： 17275-17284 2013.7

Divertor heat and particle control experiments on the large helical device Reviewed

S. Masuzaki, M.Kobayashi, T.Akiyama, N.Ohno, T.Morisaki, et al.

Journal of Nuclear Materials Vol. 438 page： S133-S138 2013.7

Edge and divertor plasma measurements with ion sensitive and Mach probes in LHD Reviewed

Y.Hayashi, N.Ezumi, S.Masuzaki, H.Tanaka, M.Kobayashi, K.Sawada, N.Ohno, the LHD Experiment Group

Journal of Nuclear Materials Vol. 438 page： S1228-S1231 2013.7

Tritium retention in nanostructured tungsten with large effective surface area Reviewed

M.Yajima, Y.Hatano, S.Kajita, J.Shi, M.Hara, N.Ohno

Journal of Nuclear Materials Vol. 438 page： S1142-S1145 2013.7

Study of hydrogen isotopes behavior in carbon based materials with in situ ion beam analysis under plasma exposure Reviewed

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

Journal of Nuclear Materials Vol. 438 page： S1036-S1039 2013.7

Influence of crystal orientation on damages of tungsten exposed to helium plasma Reviewed

N.Ohno, Y.Hirahata, M.Yamagiwa, S.Kajita, M.Takagi, N.Yoshida, R.Yoshihara, T.Tokunaga, M.Tokitani

Journal of Nuclear Materials Vol. 438 page： S879-S882 2013.7

Thermal radiation characteristics and direc evidence of tungsten cooling on the way to nanostructure formation on its surface Reviewed

S.Takamura, T.Miyamoto, N.Ohno

Journal of Nuclear Materials Vol. 438 page： S814-S817 2013.7

Recent results of divertor simulation research using an end-cell of a large tandem mirror device Reviewed

Y. Nakashima, H. Takeda, K. Ichimura, K. Hosoi, M. Sakamoto, M. Hirata, M. Ichimura, R. Ikezoe, T. Imai, T. Ishii, T. Kariya, I. Katanuma, J. Kohagura, R. Minami, T. Numakura, H. Ueda, M. Yoshikawa, N. Asakura, T. Furuta, A. Hatayama, et al.(N.Ohno No.27)

Journal of Nuclear Materials Vol. 438 page： S738-S741 2013.7

Kinetic effect of high energy ions on the temperature profile in the boundary plasma region Reviewed

N.Ezumi, Y.Hayashi, K.Todoroki, K.Okazaki, H.Tanaka, S.Masuzaki, N.Ohno

Journal of Nuclear Materials Vol. 438 page： S472-S474 2013.7

Properties of deposited layer formed by interaction with Be seeded D-He mixture plasma and tungsten Reviewed International coauthorship International journal

Tokunaga K., Baldwin M.J., Nishijima D., Doerner R.P., Nagata S., Tsuchiya B., Kurishita H., Fujiwara T., Araki K., Miyamoto Y., Ohno N., Ueda Y.

Journal of Nuclear Materials Vol. 442 ( 1-3 SUPPL.1 ) 2013.6

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

Be-seeded, high-flux, deuterium/helium mixture plasma exposure experiments on tungsten target materials have been performed to simulate ITER all tungsten divertor erosion/modification and deposition phenomena. The exposure conditions are kept fixed at a typical low-ion-energy of 60 eV and a flux of 3-6 × 1022/m2/s. Sample temperature is 1123 K and plasma exposure times spanning 1050-10,100 s are explored. The typical ratio of He/D ions is 0.2 and Be content is 0.2%. A He-induced nanostructure layer is formed on the exposure surfaces of tungsten materials and the surface of the nanostructure is covered by a thin layer of Be and O. A fraction of the re-eroded Be from the target is deposited on a glassy carbon plate with line of sight to the tungsten target. Rutherford backscattering spectrometry analyses show that the Be redeposit layer is in the form of laminae. Small amounts of Mo, W and C are also found in the redeposited Be layer. Elastic recoil detection analyses show that D, He and H are also included in the redeposited Be layer. © 2013 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.jnucmat.2013.05.006

Scopus

Field Emission Property of Nanostuructured Tungsten Formed by Helium Plasma Irradiation Reviewed

S.Kajita, N.Ohno, Y.Hirahata, M.Hiramatsu

Journal of Fusion Engineering and Design Vol. 88 page： 2842-2847 2013.6

Investigation of Advanced Divertor Magnetic Configuration for Demo Tokamak Reactor Reviewed

N.Asakura, K.Shinya, K.Tobita, K.Hoshino, K.Shimizu, H.Utoh, Y.Someya, M.Nakamura, N.Ohno, M.Kobayashi, H.Tanaka

Transactions of Fusion Science and Technology Vol. 63 ( 1T ) page： 70-75 2013.5

Power Transmission Factor for Tungsten Target W/WO Fiber-form Nanostructure in He Plasmas with Hot Electron Component using Compact Plasma Device AIT-PID Reviewed

S.Takamura, T.Miyamoto, N.Ohno

Transactions of Fusion Science and Technology Vol. 63 page： 225-228 2013.5

Impact of arcing on carbon and tungsten: from the observations in JT-60U, LHD and NAGDIS-II Reviewed

S.Kajita, M.Fukumoto, M.Tokitani, T.Nakano, Y.Noiri, N.Ohno, S.Masuzaki, S.Takamura, N.Yoshida, Y.Ueda

Nuclear Fusion Vol. 53 page： 053013(9 pp) 2013.4

Helium plasma implantation on metals: Nanostructure formation and visible-light photocatalytic response Reviewed

S.Kajita, T.Yoshida, D.Kitaoka, R.Etoh, M.Yajima, N.Ohno, H.Yoshida, N.Yoshida, Y.Terao

Journal of Applied Physics Vol. 113 page： 134301(8 pp) 2013.4

Assessment of multi-pulse laser-induced damage threshold of metallic mirrors for Thomson scattering system Reviewed

M.Sato, S.Kajita, R.Yasuhara, N.Ohno, M.Tokitani, N.Yoshida, Y.Tawara

Optics Express Vol. 21 ( 8 ) page： 9333-9342 2013.4

Comparison of damages on tungsten surfac exposed to noble gas plasmas Reviewed

M.Yajima, M.Yamagiwa, S.Kajita, N.Ohno et al.

Plasma Science & Technol. Vol. 15 page： 282-286 2013.3

Two-dimensional visualization of excitation temperature and chemical species in divertor plasmas: Trace CD molecules by chemical sputtering of fusion plasma reactor wall Reviewed

Z.Cui, K.Kodama, M.Yamamoto, Q.Shen, M.Yoshimi, S.Kajita, N.Ohno, K.Kitagawa

Microchemical Journal Vol. 106 page： 174-179 2013.1

Influence of the Probe Electrode on Probe Measurements for Atmospheric Pressure Microwave Plasma Torch Reviewed International journal

Ezumi N., Kodama N., Akahane K., Shiozawa S., Sawada K., Ohno N.

Contributions to Plasma Physics Vol. 53 ( 1 ) page： 81 - 85 2013.1

Authorship：Last author Language：English Publishing type：Research paper (scientific journal) Publisher：Contributions to Plasma Physics

In this study, in order to clarify the influence of a probe electrode during probe measurements of an atmospheric pressure microwave plasma, simultaneous observations of probe current and the change of plasma shape using a high-speed camera have been done. Fast and random repetitions of attachment and detachment of the plasma torch to the probe electrode have been observed. It is found that the response time is related to ion sound speed. Different behaviors of the plasma torch for a floating metal electrode or an insulator have been observed. Probe current-voltage characteristics show asymmetric double probe shape © 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

DOI： 10.1002/ctpp.201310014

Scopus

First Principles Investigation on Trapping of Multiple Helium Atoms within a Tungsten Monovacancy Reviewed

A.Takayama, A.M.Ito, S.Saito, N.Ohno, H.Nakamura

Japanese Journal of Applied Physics Vol. 52 page： 01AL03(4 pp) 2013

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Papers - OHNO, Noriyasu