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Nagai, Takayuki; Aoyama, Yusuke; Okamoto, Yoshihiro; Shibata, Daisuke*; Asakura, Kiyotaka*; Hasegawa, Takehiko*; Sato, Seiichi*; Fukaya, Akane*; Kikuchi, Tetsuya*; Hatakeyama, Kiyoshi*
JAEA-Research 2025-009, 122 Pages, 2025/11
JAEA-Research-2025-009.pdf:20.77MB
XAFS measurements in the soft X-ray region are suitable for evaluating the chemical state of the surface layer of a measurement sample because the X-ray transmittance is low. This study measured the K-edges of the glass-forming elements boron (B), oxygen (O), sodium (Na), and silicon (Si), as well as the L
-edge of the waste component cerium (Ce), to verify the differences between the coagulated layer and the inside of simulated waste glasses made from raw glass compositions with increased alumina concentration. As a result, from the B K-edge XANES spectra, the proportion of B-O tetracoordinate sp
structures (BO
) on the surface layer of the coagulated glass samples was higher than that on the cut surface inside the glass samples. On the other hand, the O K-edge XANES spectra showed differences by measuring points for each glass sample, but the trends of those differences varied between the glass samples. The reason is that the molten raw glass with increased alumina concentration has a high viscosity, making it impossible to produce waste glasses with a uniform composition. The Na and Si K-edge spectra showed no differences between the coagulated layer and the inside of glass samples. In addition, the Ce L-edge XANES spectra confirmed that the Ce valence in the coagulated layer of glass samples was more oxidized compared to that in the inside of glass samples.
Kato, Masaru*; Muto, Marika*; Matsubara, Naohiro*; Uemura, Yohei*; Wakisaka, Yuki*; Yoneuchi, Tsubasa*; Matsumura, Daiju; Ishibara, Tomoko*; Tokushima, Takashi*; Noro, Shinichiro*; et al.
ACS Applied Energy Materials (Internet), 1(5), p.2358 - 2364, 2018/05
Times Cited Count：18 Percentile：47.99(Chemistry, Physical)
(110)(1
2) surface using total-reflection high-energy positron diffraction (TRHEPD)Mochizuki, Izumi*; Ariga, Hiroko*; Fukaya, Yuki; Wada, Ken*; Maekawa, Masaki*; Kawasuso, Atsuo*; Shidara, Tetsuo*; Asakura, Kiyotaka*; Hyodo, Toshio*
Hyomen Kagaku, 37(9), p.451 - 456, 2016/09
no abstracts in English
(110)-(12) surface using total-reflection high-energy positron diffraction (TRHEPD)Mochizuki, Izumi*; Ariga, Hiroko*; Fukaya, Yuki; Wada, Ken*; Maekawa, Masaki; Kawasuso, Atsuo; Shidara, Tetsuo*; Asakura, Kiyotaka*; Hyodo, Toshio*
Physical Chemistry Chemical Physics, 18(10), p.7085 - 7092, 2016/03
Times Cited Count：26 Percentile：69.75(Chemistry, Physical)no abstracts in English
Tobita, Kenji; Nishio, Satoshi*; Enoeda, Mikio; Nakamura, Hirofumi; Hayashi, Takumi; Asakura, Nobuyuki; Uto, Hiroyasu; Tanigawa, Hiroyasu; Nishitani, Takeo; Isono, Takaaki; et al.
JAEA-Research 2010-019, 194 Pages, 2010/08
JAEA-Research-2010-019-01.pdf:48.47MBJAEA-Research-2010-019-02.pdf:19.4MB
This report describes the results of the conceptual design study of the SlimCS fusion DEMO reactor aiming at demonstrating fusion power production in a plant scale and allowing to assess the economic prospects of a fusion power plant. The design study has focused on a compact and low aspect ratio tokamak reactor concept with a reduced-sized central solenoid, which is novel compared with previous tokamak reactor concept such as SSTR (Steady State Tokamak Reactor). The reactor has the main parameters of a major radius of 5.5 m, aspect ratio of 2.6, elongation of 2.0, normalized beta of 4.3, fusion out put of 2.95 GW and average neutron wall load of 3 MW/m
. This report covers various aspects of design study including systemic design, physics design, torus configuration, blanket, superconducting magnet, maintenance and building, which were carried out increase the engineering feasibility of the concept.
Tobita, Kenji; Nishio, Satoshi; Enoeda, Mikio; Kawashima, Hisato; Kurita, Genichi; Tanigawa, Hiroyasu; Nakamura, Hirofumi; Honda, Mitsuru; Saito, Ai*; Sato, Satoshi; et al.
Nuclear Fusion, 49(7), p.075029_1 - 075029_10, 2009/07
Times Cited Count：145 Percentile：97.39(Physics, Fluids & Plasmas)Recent design study on SlimCS focused mainly on the torus configuration including blanket, divertor, materials and maintenance scheme. For vertical stability of elongated plasma and high beta access, a sector-wide conducting shell is arranged in between replaceable and permanent blanket. The reactor adopts pressurized-water-cooled solid breeding blanket. Compared with the previous advanced concept with supercritical water, the design options satisfying tritium self-sufficiency are relatively scarce. Considered divertor technology and materials, an allowable heat load to the divertor plate should be 8 MW/m or lower, which can be a critical constraint for determining a handling power of DEMO (a combination of alpha heating power and external input power for current drive).
Nakano, Tomohide; Yoshida, Maiko; Suzuki, Takahiro; Oyama, Naoyuki; Kawano, Yasunori; Isayama, Akihiko; Hamamatsu, Kiyotaka; Asakura, Nobuyuki
Purazuma, Kaku Yugo Gakkai-Shi, 85(7), p.472 - 475, 2009/07
no abstracts in English
Idomura, Yasuhiro; Yoshida, Maiko; Yagi, Masatoshi*; Tanaka, Kenji*; Hayashi, Nobuhiko; Sakamoto, Yoshiteru; Tamura, Naoki*; Oyama, Naoyuki; Urano, Hajime; Aiba, Nobuyuki; et al.
Purazuma, Kaku Yugo Gakkai-Shi, 84(12), p.952 - 955, 2008/12
no abstracts in English
(110) surface using high brightness reflection high-energy positron diffractionMochizuki, Izumi*; Ariga, Hiroko*; Fukaya, Yuki; Wada, Ken*; Hyodo, Toshio*; Asakura, Kiyotaka*; Maekawa, Masaki; Kawasuso, Atsuo
no journal, ,
no abstracts in English
(110) surface studied by total reflection high-energy positron diffractionMochizuki, Izumi*; Ariga, Hiroko*; Fukaya, Yuki; Wada, Ken*; Hyodo, Toshio*; Shidara, Tetsuo*; Asakura, Kiyotaka*; Maekawa, Masaki; Kawasuso, Atsuo
no journal, ,
no abstracts in English
(110)-(12) surface studied by total reflection high-energy positron diffractionMochizuki, Izumi*; Ariga, Hiroko*; Fukaya, Yuki; Wada, Ken*; Hyodo, Toshio*; Shidara, Tetsuo*; Asakura, Kiyotaka*; Maekawa, Masaki; Kawasuso, Atsuo
no journal, ,
no abstracts in English
(110) surfacesMochizuki, Izumi*; Ariga, Hiroko*; Fukaya, Yuki; Wada, Ken*; Asakura, Kiyotaka*; Maekawa, Masaki; Kawasuso, Atsuo; Shidara, Tetsuo*; Hyodo, Toshio*
no journal, ,
no abstracts in English
)-Pt and rutile-TiO(110)-(
) surfaces determined by TRHEPD rocking curve analysisMochizuki, Izumi*; Ariga, Hiroko*; Fukaya, Yuki; Wada, Ken*; Asakura, Kiyotaka*; Maekawa, Masaki; Kawasuso, Atsuo; Shidara, Tetsuo*; Hyodo, Toshio*
no journal, ,
no abstracts in English
(110)-() surface using high-brightness reflection high-energy positron diffractionMochizuki, Izumi*; Ariga, Hiroko*; Fukaya, Yuki; Wada, Ken*; Hyodo, Toshio*; Asakura, Kiyotaka*; Maekawa, Masaki; Kawasuso, Atsuo
no journal, ,
no abstracts in English
Nagai, Takayuki; Okamoto, Yoshihiro; Shibata, Daisuke*; Asakura, Kiyotaka*; Hasegawa, Takehiko*; Sato, Seiichi*; Kikuchi, Tetsuya*; Hatakeyama, Kiyoshi*
no journal, ,
no abstracts in English
(110) surface by high-brightness reflection high-energy positron diffractionMochizuki, Izumi*; Ariga, Hiroko*; Fukaya, Yuki; Wada, Ken*; Hyodo, Toshio*; Asakura, Kiyotaka*; Maekawa, Masaki; Kawasuso, Atsuo
no journal, ,
no abstracts in English
(110) surfaces studied by high-brightness reflection high-energy positron diffractionMochizuki, Izumi*; Ariga, Hiroko*; Fukaya, Yuki; Wada, Ken*; Hyodo, Toshio*; Asakura, Kiyotaka*; Maekawa, Masaki; Kawasuso, Atsuo
no journal, ,
no abstracts in English
Mochizuki, Izumi*; Ariga, Hiroko*; Fukaya, Yuki; Wada, Ken*; Hyodo, Toshio*; Asakura, Kiyotaka*; Maekawa, Masaki; Kawasuso, Atsuo
no journal, ,
no abstracts in English
(110) surface studied by high-brightness reflection high-energy positron diffractionMochizuki, Izumi*; Ariga, Hiroko*; Fukaya, Yuki; Wada, Ken*; Hyodo, Toshio*; Asakura, Kiyotaka*; Maekawa, Masaki; Kawasuso, Atsuo
no journal, ,
no abstracts in English
