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Matsumura, Daiju; Kato, Kazuo*
Hoshako, 34(1), p.3 - 11, 2021/01
no abstracts in English
X-ray absorption spectroscopy study on water formation reaction of palladium metal nanoparticle catalystsMatsumura, Daiju; Taniguchi, Masashi*; Tanaka, Hirohisa*; Nishihata, Yasuo
International Journal of Hydrogen Energy, 42(11), p.7749 - 7754, 2017/03
Times Cited Count：10 Percentile：23.39(Chemistry, Physical)
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studied by time-resolved XAFS using dispersive opticsMatsumura, Daiju; Okajima, Yuka*; Nishihata, Yasuo
Journal of Physics; Conference Series, 712(1), p.012042_1 - 012042_4, 2016/06
Times Cited Count：0 Percentile：0.00(Physics, Applied)Matsumura, Daiju; Kobayashi, Toru; Miyazaki, Yuji; Okajima, Yuka*; Nishihata, Yasuo; Yaita, Tsuyoshi
Clay Science, 18(4), p.99 - 105, 2014/12
Sato, Shunsuke*; Shinohara, Yasushi*; Otobe, Tomohito; Yabana, Kazuhiro*
Physical Review B, 90(17), p.174303_1 - 174303_8, 2014/11
Times Cited Count：48 Percentile：82.71(Materials Science, Multidisciplinary)We calculate the dielectric response of excited crystalline silicon in electron thermal equilibrium by adiabatic time-dependent density functional theory (TDDFT) to model the response to irradiation by high-intensity laser pulses. We find that the extracted effective mass are in the range of 0.22-0.36 and lifetimes are in the range of 1-14 fs depending on the temperature.
Yonekawa, Izuru; Sueoka, Michiharu; Hosoyama, Hiroki*; Kawamata, Yoichi; Suzuki, Takahiro; Kurihara, Kenichi
Fusion Engineering and Design, 81(15-17), p.1897 - 1903, 2006/07
Times Cited Count：2 Percentile：16.48(Nuclear Science & Technology)Recent years, plasma current profile (j-profile) control has been newly proposed to avoid instabilities in the high normalized-beta plasma. In particular, for the real-time profile feedback control, the control period should be roughly less than several tens of ms, including data communication among relating systems. In order to minimize data transfer time,the profile data being a function of time and position is required to decrease its data size for efficient data handling. A profile data,defined as 3-dimension time series data (q,R,Z,t), was reduced by introducing normalized minor radius rho in place of (R,Z). Data handling for profile control will be presented with their technical issues, together with computing hardware engineering.
Kurihara, Kenichi; Kawamata, Yoichi; Sueoka, Michiharu; Hosoyama, Hiroki*; Yonekawa, Izuru; Suzuki, Takahiro; Oikawa, Toshihiro; Ide, Shunsuke; JT-60 Team
Fusion Engineering and Design, 74(1-4), p.527 - 536, 2005/11
Times Cited Count：17 Percentile：70.14(Nuclear Science & Technology)Since tokamak magnetic fusion research has just made a step forward to an international collaborative project ITER, the existing tokamaks including JT-60 are expected to explore more advanced operation scenarios. To test those scenarios in the JT-60 experiment, the basic methods for understanding of plasma equilibrium have been developed. Some of them have been accomplished, and the other are being conducted as follows: (1) A complete plasma shape is precisely reproduced in real time. (2) Eddy current effects are considered for shape reproduction. (3) A plasma current profile in the poloidal cross-section is reproduced in real. (4) For long-pulse DT operation, a method is developed to correct the drifted signal of the integrator for a pick-up coil by employing distant sensor signals. In the symposium, those methods will be explained in detail with the experimental results at JT-60. On the basis of such discussion, we would like to envisage a future of plasma equilibrium control toward ITER and a fusion power plant.
Sueoka, Michiharu; Hosoyama, Hiroki*; Suzuki, Takahiro; Yonekawa, Izuru; Kurihara, Kenichi
Heisei-16-Nendo Osaka Daigaku Sogo Gijutsu Kenkyukai Hokokushu (CD-ROM), 4 Pages, 2005/03
no abstracts in English
Nakatani, Takeshi; Agui, Akane; Yoshigoe, Akitaka; Matsushita, Tomohiro*; Takao, Masaru*; Takeuchi, Masao*; Aoyagi, Hideki*; Tanaka, Hitoshi*
JAERI-Tech 2004-013, 16 Pages, 2004/12
JAERI-Tech-2004-013.pdf:3.55MB
We observed two characteristic electron orbit fluctuations caused when the phase of ID23 (APPLE-2 type undulator) installed at SPring-8 was driven. One was caused by the variation of magnetic error filed of ID23 when the phase was driven. The other was caused by the noise from the phase drive system which adoped AC servomotors. We measured these orbit fluctuations synchronized with the phase motion using the real-time electron beam position measurement system. The part of the orbit fluctuation was supressed by the correction table which was made referring to the obtained data.
discharges and real-time control of current profile in JT-60USuzuki, Takahiro; Isayama, Akihiko; Sakamoto, Yoshiteru; Ide, Shunsuke; Fujita, Takaaki; Takenaga, Hidenobu; Luce, T. C.*; Wade, M. R.*; Oikawa, Toshihiro; Naito, Osamu; et al.
Proceedings of 20th IAEA Fusion Energy Conference (FEC 2004) (CD-ROM), 8 Pages, 2004/11
no abstracts in English
Oikawa, Toshihiro; Tsuchiya, Katsuhiko; Kurihara, Kenichi; Kawamata, Yoichi; Fukuda, Takeshi*; Fujita, Takaaki; Neyatani, Yuzuru
Fusion Engineering and Design, 70(2), p.175 - 183, 2004/02
Times Cited Count：6 Percentile：39.19(Nuclear Science & Technology)The real-time feedback control of the plasma stored energy has been developed for control of the plasma MHD stability in the JT-60U tokamak. The plasma stored energy can be detected with high accuracy in real-time by the function parametrization method for various plasmas available in JT-60U, such as the ohmic plasma, the L-mode, the H-mode, the high poloidal beta mode and the reversed shear mode over a wide range of the plasma parameters. By manipulating the neutral beam injection power, the plasma stored energy has been successfully controlled along the preprogrammed reference waveform. Especially in the reversed shear mode, this feedback control scheme has improved the reproducibility of the formation of the internal transport barrier, and the MHD instability could be suppressed with keeping the normalized beta in the stable region. The D-T equivalent fusion amplification gain of 0.5 was sustained for 0.8 s in a reversed shear plasma by employing this feedback control scheme.
Hosoyama, Hiroki*; Sueoka, Michiharu; Suzuki, Takahiro
KEK Proceedings 2003-16 (CD-ROM), 4 Pages, 2004/02
no abstracts in English
Sakata, Shinya; Tsugita, Tomonori; Matsuda, Toshiaki
Heisei-15-Nendo Koenerugi Kasokuki Kenkyu Kiko Gijutsu Kenkyukai Hokokushu (CD-ROM), 4 Pages, 2004/00
no abstracts in English
Oikawa, Toshihiro; Tsuchiya, Katsuhiko; Kurihara, Kenichi; Kawamata, Yoichi; Fukuda, Takeshi*; Fujita, Takaaki; Akasaka, Hiromi; Yonekawa, Izuru; Neyatani, Yuzuru
JAERI-Research 2003-027, 19 Pages, 2003/12
JAERI-Research-2003-027.pdf:1.14MB
no abstracts in English
Hosoyama, Hiroki*; Sueoka, Michiharu; Kawamata, Yoichi
Heisei-14-Nendo Tokyo Daigaku Sogo Gijutsu Kenkyukai Gijutsu Hokokushu, p.359 - 361, 2003/03
no abstracts in English
Kawano, Yasunori; JT-60 Team
Proceedings of 30th EPS Conference on Controlled Fusion and Plasma Physics (CD-ROM), 4 Pages, 2003/00
Diagnostics play essential roles both in understanding of the plasma physics and in control of the plasma itself. JT-60U has plenty of developments and thus experiences in concepts of the real-time feedback control. The parameters concerned are averaged electron density, neutron emission rate, plasma stored energy, central electron temperature, temperature gradient, temperature fluctuations, current density profile, plasma radiation, outer gap distance, neutral gas pressure, etc., and those combinations. In JT-60U, production of high-performance fusion plasmas and their sustainment owed to such the real-time feedback control. In this paper, the overview of diagnostics equipped for the real-time feedback control in JT-60U is presented.
Fukuda, Takeshi; Oikawa, Toshihiro; Takeji, Satoru; Isayama, Akihiko; Kawano, Yasunori; Neyatani, Yuzuru; Nagashima, Akira; Nishitani, Takeo; Konoshima, Shigeru; Tamai, Hiroshi; et al.
Fusion Science and Technology (JT-60 Special Issue), 42(2-3), p.357 - 367, 2002/09
Times Cited Count：7 Percentile：42.96(Nuclear Science & Technology)no abstracts in English
analysis using synchrotron radiation photoemission spectroscopy for initial oxidation of oxygen preadsorbed Si(001) surfaces induced by supersonic O molecular beamsYoshigoe, Akitaka; Teraoka, Yuden
Surface and Interface Analysis, 34(1), p.432 - 436, 2002/08
Times Cited Count：3 Percentile：8.36(Chemistry, Physical)no abstracts in English
observation on oxygen chemisorption states on Si(001)-2
1 during supersonic oxygen molecular beam irradiationYoshigoe, Akitaka; Teraoka, Yuden
Applied Surface Science, 190(1-4), p.60 - 65, 2002/05
Times Cited Count：10 Percentile：46.89(Chemistry, Physical)no abstracts in English
laser interferometerChiba, Shinichi; Kawano, Yasunori; Tsuchiya, Katsuhiko; Inoue, Akira*
JAERI-Research 2001-050, 59 Pages, 2001/11
JAERI-Research-2001-050.pdf:15.28MB
no abstracts in English
