Faculty Profiles - OHNO, Noriyasu

Papers - OHNO, Noriyasu

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Isotope Effect for Plasma Detachment in Helium and Hydrogen/Deuterium Mixture Plasmas Reviewed International journal Open Access

GUO Xinyue, TANAKA Hirohiko, KAJITA Shin, OHNO Noriyasu, HATTORI Shogo, SAWADA Keiji

Plasma and Fusion Research Vol. 17 ( 0 ) page： 2402027 - 2402027 2022.5

Language：English Publishing type：Research paper (scientific journal) Publisher：The Japan Society of Plasma Science and Nuclear Fusion Research

To investigate the isotope effect on the plasma detachment in helium (He) and hydrogen (H)/deuterium (D) mixture plasmas, we performed H2, D2 or He gas puffing into He plasma in the linear plasma device NAGDIS-II. Axial distributions of electron density (ne) and electron temperature (Te) were obtained using a movable Langmuir probe. Additionally, optical emission spectroscopy (OES) was applied to measure axial distributions of Balmer lines and He I lines. When the neutral gas pressure was high (ΔPn = 7 ∼10 mTorr), ne distribution in He-D2 mixture plasma was similar to that in pure He plasma, showing a sharp decrease at the downstream region where Te < 1 eV. In contrast, in He-H2 mixture plasma, a decrease in ne was confirmed from upstream region where Te > 1 eV. The upstream Hα/Hγ in He-H2 plasma was significantly larger than the Dα/Dγ in He-D2 plasma at the same Te. This result indicated that molecular activated recombination (MAR) processes significantly occurred in He-H2 plasma, while electron-ion recombination (EIR) processes were dominant in He-D2 and pure He plasmas.

DOI： 10.1585/pfr.17.2402027

Open Access

Scopus

CiNii Research

Study of optical emission spectroscopy in dual frequency synchronized pulsed capacitively coupled discharges with DC bias at low-pressure in Ar/O2/C4F8 plasma etching Reviewed International coauthorship

B.B,Sahu, K.Nakane, K.Ishikawa, M.Sekine, T.Tsutsumi, T.Gohira, Y.Ohya, N.Ohno, M.Hori

Physical Chemistry Chemical Physics Vol. 24 page： 13883 - 13896 2022.5

Changes in morphology and field emission property of nano-tendril bundles after high temperature annealing Reviewed International coauthorship International journal Open Access

Zhang R., Kajita S., Hwangbo D., Sinelnikov D., Tanaka H., Ohno N.

Nuclear Materials and Energy Vol. 31 page： 101178 2022.4

An approach to implement a heat flux limit in a model for fusion relevant plasmas Reviewed International coauthorship

M.Z.Tokar, M.Kobayashi, N.Ohno

Physics of Plasmas Vol. 29 page： 32502 2022.3

Completion of JT-60SA construction and contribution to ITER Reviewed International coauthorship International journal Open Access

Kamada Y., Di Pietro E., Hanada M., Barabaschi P., Ide S., Davis S., Yoshida M., Giruzzi G., Sozzi C., Abdel Maksoud W., Abe H., Aiba N., Akiyama T., Ayllon-Guerola J., Arai T., Artaud J.F., Asakura N., Ashikawa N., Balbinot L., Bando T., Baulaigue O., Belonohy E., Bin W., Bombarda F., Bolzonella T., Bonne F., Bonotto M., Botija J., Cabrera-Pérez S., Cardella A., Carraro L., Cavalier J., Chernyshova M., Chiba S., Clement-Lorenzo S., Cocilovo V., Coda S., Coelho R., Coffey I., Collin B., Corato V., Cucchiaro A., Czarski T., Dairaku M., Davis S., Day C., de la Luna E., De Tommasi G., Decool P., Di Pace L., Di Pietro E., Dibon M., Disset G., Ejiri A., Endo Y., Ezumi N., Falchetto G., Fassina A., Fejoz P., Ferro A., Fietz W., Figini L., Fornal T., Frello G., Fujita T., Fukuda T., Fukui K., Fukumoto M., Furukawa M., Futatani S., Gabellieri L., Gaio E., Galazka K., Garcia J., Garcia-Dominguez J., Garcia-Lopez J., Garcia-Munoz M., Garzotti L., Gasparini F., Gharafi S., Giacomelli L., Ginoulhiac G., Giruzzi G., Giudicotti L., Guillén González R., Hajnal N., Hall S., Hamada K., Hanada K., Hanada M., Hasegawa K., Hatae T., Hatakeyama S., Hauer V., Hayashi N., Hayashi T., Heller R., Higashijima S., Hinata J.

Nuclear Fusion Vol. 62 ( 4 ) page： 42002 2022.3

Surface modification of GaN/GaAs/Si by Ar plasma irradiation with radio frequency biasing for optical applications Reviewed Open Access

Shi Quan, Uehara Hiyori, Yasuhara Ryo, Ohno Noriyasu, Uehara Hiyori

JSAP Annual Meetings Extended Abstracts Vol. 2022.1 ( 0 ) page： 1486 - 1486 2022.2

Nitrogen Atom Density Measurements in NAGDIS-T Using Vacuum Ultraviolet Absorption Spectroscopy Reviewed Open Access

NISHIO Ryosuke, KAJITA Shin, TANAKA Hirohiko, ASAOKA Koji, TSUTSUMI Takayoshi, HORI Masaru, OHNO Noriyasu

Plasma and Fusion Research Vol. 17 ( 0 ) page： 1201004 - 1201004 2022.1

Authorship：Last author Language：English Publishing type：Research paper (scientific journal) Publisher：The Japan Society of Plasma Science and Nuclear Fusion Research

For the development of a high nitrogen atom density source, we produced nitrogen plasmas and measured the nitrogen atom density using vacuum ultraviolet absorption spectroscopy (VUVAS) at high neutral gas pressure (>1.5 mTorr) and discharge power (>500 W) in the NAGDIS-T, which could generate spiral-shaped dissociative recombining plasmas. It was seen that the nitrogen atom density increases with increasing neutral gas pressure and discharge power, and it reached 6.2 × 1017 m−3. In the low gas pressure case, the estimated atom density was confirmed to be consistent with that measured by the actinometry method.

DOI： 10.1585/pfr.17.1201004

Open Access

Web of Science

CiNii Research

Plasma induced surface nanostructure on semiconductors for the application of random laser Reviewed

Shi Q., Fujiwara H., Osaka R., Kajita S., Yasuhara R., Ohno N., Uehara H.

Optics InfoBase Conference Papers 2022

Photoelectrochemical properties of plasma-induced nanostructured tungsten oxide Reviewed International coauthorship International journal Open Access

Feng S., Kajita S., Higashi M., Bieberle-Hütter A., Yoshida T., Ohno N.

Applied Surface Science Vol. 580 page： 151979(7 pp) 2021.12

Growth of Mo Large-Scale Fiberform Nanostructures Reviewed Open Access

Kajita Shin, Okuyama Tatsuki, Tanaka Hirohiko, Ohno Noriyasu

PLASMA AND FUSION RESEARCH Vol. 16 ( 0 ) page： 1206105 - 1206105 2021.12

Language：English Publishing type：Research paper (scientific journal) Publisher：一般社団法人プラズマ・核融合学会

We performed helium (He) plasma irradiation to molybdenum (Mo) substrate with auxiliary Mo deposition. Different from W cases, large-scale fiberform nanostructure (LFN) growth did not occur easily. The experiments suggested that the experimental condition of Mo LFN growth has a much narrower conditional window than that of fuzz growth or another hidden control factor exists for LFN growth.

DOI： 10.1585/pfr.16.1206105

Open Access

Web of Science

CiNii Research

Penetration of deuterium into neutron-irradiated tungsten under plasma exposure Reviewed Open Access

Miyuki Yajima, Yuji Hatano, Vladimir Alimov, Takeshi Toyama, Tatsuya Kuwabara, Thomas Schwarz-Selinger, Yasuhisa Oya, Alexander Spitsyn, Noriyasu Ohno

Physica Scripta Vol. 96 ( 12 ) page： 124042 2021.10

The dependence of Mo ratio on the formation of uniform black silicon by helium plasma irradiation Reviewed International coauthorship

Shi Quan, Kajita Shin, Feng Shuangyuan, Ohno Noriyasu

JOURNAL OF PHYSICS D-APPLIED PHYSICS Vol. 54 ( 40 ) page： 405202 2021.10

Enhanced photocatalytic ethylene decomposition with anatase-rutile mixed nanostructures formed by He plasma treatment Reviewed

Kajita S., Miyaguchi K., Tanaka H., Yasunaga E., Yoshida T., Ohno N.

Journal of Photochemistry and Photobiology A: Chemistry Vol. 418 page： 113420(8 pp) 2021.9

Thermal treatment of W large-scale fiberform nanostructures Reviewed Open Access

Kajita Shin, Okuyama Tatsuki, Tanaka Hirohiko, Kuwabara Tatsuya, Ohno Noriyasu, Yoshida Naoaki

PHYSICA SCRIPTA Vol. 96 ( 9 ) 2021.9

Enhancement of Arc Ignition on Tungsten in Helium Plasmas with Impurity Gases Reviewed International coauthorship Open Access

ZHANG Rongshi, KAJITA Shin, HWANGBO Dogyun, TANAKA Hirohiko, OHNO Noriyasu

Plasma and Fusion Research Vol. 16 ( 0 ) page： 24045069(5 pp) - 2405069 2021.5

Modeling of the impurity-induced silicon nanocone growth by low energy helium plasma irradiation Reviewed International coauthorship

Q Shi, S Kajita, S Dai, S Feng, N Ohno

Plasma Science and Technology Vol. 23 ( 4 ) page： 45503 2021.4

Influence of Nitrogen Ratio on Plasma Detachment during Combined Seeding with Hydrogen on Divertor Simulation Experiment of GAMMA 10/PDX Reviewed Open Access

GAMO Hiroki, HWANGBO Dogyun, SAKAMOTO Mizuki, PERILLO Renato, KUWABARA Tatsuya, TANAKA Hirohiko, OHNO Noriyasu, SAWADA Keiji, TONEGAWA Akira, MASUZAKI Suguru, EZUMI Naomichi, SUGIYAMA Tsukasa, NOJIRI Kunpei, KONDO Ayane, HIRATA Mafumi, KOHAGURA Junko, YOSHIKAWA Masayuki, NAKASHIMA Yousuke

Plasma and Fusion Research Vol. 16 ( 0 ) page： 2402041 - 2402041 2021.3

Computer Tomography on Divertor Impurity Monitor for ITER with Miinimizing Errors in a Logarithmic Scale Invited Reviewed International coauthorship Open Access

H.Natsume, S.Kajita, V.S.Neverov, R.I.Khusnutdinov, E.Veshchev, M.DE Rock, A.R.Polevoi, H.Tanaka, N.Ohno, H.Ogawa, S.Kitazawa

Plasma and Fusion Research Vol. 16 ( 0 ) page： 2405019 - 2405019 2021.3

Particle-in-cell-Monte Carlo collision simulation and experimental measurement of Ar plasma in a fast atom beam source for surface-activated bonding Reviewed International journal

R.Morisaki, T.Yamazaki, C.Oka, J.Sakurai, T.Hirai, T.Takahashi, H.Tsuji, N.Ohno, S.Hata

Japanese Journal of Applied Physics Vol. 60 ( SC ) page： SCCB01 2021.3

Doppler and Stark Broadenings of He II Emission in NAGDIS-PG Invited Reviewed Open Access

S.Kajita, T.Nakamori, H.Tanaka, Y.Kikuchi, N.Ohno

Plasma and Fusion Research: Rapid Communications Vol. 16 ( 0 ) page： 1202013 - 1202013 2021.2

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Papers - OHNO, Noriyasu