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Journal Articles

Study of plasma current decay in the initial phase of high poloidal beta disruptions in JT-60U

Shibata, Yoshihide*; Watanabe, Kiyomasa*; Ono, Noriyasu*; Okamoto, Masaaki*; Isayama, Akihiko; Kurihara, Kenichi; Oyama, Naoyuki; Nakano, Tomohide; Kawano, Yasunori; Matsunaga, Go; et al.

Plasma and Fusion Research (Internet), 6, p.1302136_1 - 1302136_4, 2011/10

no abstracts in English

Journal Articles

Relativistic density-functional study of solid solubitilty of tansiton metal/$$gamma$$-uranium alloys; The Roll of d-d orbital interactions

Kurihara, Masayoshi*; Onoe, Jun*; Hirata, Masaru; Suzuki, Chikashi

Journal of Alloys and Compounds, 509(4), p.1152 - 1156, 2011/01

 Times Cited Count:3 Percentile:24.21(Chemistry, Physical)

The alloying behavior of transition metals (TMs) in solid $$gamma$$-phase uranium ($$gamma$$-U), which is expected to be used as fuel for next-generation nuclear reactors, is investigated using the discrete-variational Dirac-Fock-Slater molecular orbital method. Using a model cluster, U$$_{8}$$/TM, as the minimum unit of $$gamma$$-U/TM alloys, we evaluate the d-orbital energy of the TM (Md), the bond order between the TM and U atoms, and the orbital overlap population (OOP) between the atomic orbitals of the TM and U atoms. We subsequently examine the effect of these quantities on the maximum solid solubility (MSS) of the $$gamma$$-U/TM alloys. Md and the OOP (U 6d-TM d) exhibit good correlations with the MSS for $$gamma$$-U/TM alloys, so that the interaction between the U-6d and TM-d atomic orbitals is found to play a key role in determining the MSS of the $$gamma$$-U/TM alloys. The magnitude of the MSS can be explained in terms of the stabilization energy caused by U 6d-TM d orbital interactions for $$gamma$$ -U/TM alloys, which is affected by the Md and the OOP. The exponential dependence of the MSS on Md and the OOP is explained in terms of the equilibrium constant obtained using a substitution cluster model for $$gamma$$-U/TM alloys. We also map the MSS of $$gamma$$-U/TM alloys using the Md and the OOP as the alloying parameters. These results will assist the quantum design of nuclear fuel materials for other alloy systems besides the present alloy system.

Journal Articles

Study of current decay time during disruption in JT-60U tokamak

Shibata, Yoshihide*; Watanabe, Kiyomasa*; Okamoto, Masaaki*; Ono, Noriyasu*; Isayama, Akihiko; Kurihara, Kenichi; Nakano, Tomohide; Oyama, Naoyuki; Kawano, Yasunori; Matsunaga, Go; et al.

Nuclear Fusion, 50(2), p.025015_1 - 025015_7, 2010/01

 Times Cited Count:14 Percentile:52.54(Physics, Fluids & Plasmas)

no abstracts in English

Journal Articles

Optimization of the viewing chord arrangement of the ITER poloidal polarimeter

Yamaguchi, Taiki; Kawano, Yasunori; Fujieda, Hirobumi; Kurihara, Kenichi; Sugihara, Masayoshi*; Kusama, Yoshinori

Plasma Physics and Controlled Fusion, 50(4), p.045004_1 - 045004_15, 2008/04

The poloidal polarimeter will be installed in the International Thermonuclear Experimental Reactor (ITER) to measure the safety factor profile. The number of viewing chords is restricted to about 15 channels. Therefore optimization of the viewing chord arrangement is necessary to diagnose the accurate safety factor profile. In this study, we studied the optimum viewing chord arrangement for the equilibria of ITER operation scenarios using the equilibrium reconstruction. For the burning phase of inductive scenario, the error of the safety factor on the magnetic axis was 35% if the viewing chords are not arranged in the peripheral region. It was improved to 3% by arranging the viewing chord of the upper port to peripheral region. This arrangement was used for the reconstruction of the burning phase in the noninductive scenario and of the phase of the plasma current 3.5 MA in the inductive operation scenario. As the result, the accuracy does not decrease drastically.

Journal Articles

Optimization of the viewing chord arrangement of the ITER poloidal polarimeter

Yamaguchi, Taiki; Kawano, Yasunori; Fujieda, Hirobumi; Kurihara, Kenichi; Sugihara, Masayoshi*; Kusama, Yoshinori

Plasma Physics and Controlled Fusion, 50(4), p.045004_1 - 045004_15, 2008/04

 Times Cited Count:10 Percentile:38.41(Physics, Fluids & Plasmas)

We have studied the viewing chord arrangement of the poloidal polarimeter in the International Thermonuclear Experimental Reactor (ITER). We have optimized the viewing chord arrangement based on the evaluation using a magnetohydrodynamic equilibrium reconstruction code. This reconstruction code has been developed in this study. We have successfully optimized viewing chord arrangements for three equilibria of the ITER operation scenario. The accuracy of the central safety factor within 3% has been achieved in each case. Furthermore, the viewing chord arrangement, which is optimized for the inductive operation scenario II at the start of the burn phase (S2-SOB), has been applied for other equilibria. As the result, the accuracy has not deteriorated drastically compared with the accuracy which is evaluated using the optimized arrangement for each equilibrium. The viewing chord arrangement for S2-SOB is proposed as the most promising candidate of the ITER poloidal polarimeter.

Journal Articles

Application of the relativistic DV-X$$alpha$$ molecular orbital method to $$gamma$$-uranium alloys with transition metals

Kurihara, Masayoshi*; Hirata, Masaru; Onoe, Jun*; Nakamatsu, Hirohide*

Progress in Nuclear Energy, 50(2-6), p.549 - 555, 2008/03

 Times Cited Count:1 Percentile:10.12(Nuclear Science & Technology)

The alloying behavior of 4d and 5d transition metals (TMs) in $$gamma$$-phase solid uranium (U) has been investigated using the discrete-variational Dirac-Fock-Slater (DV-DFS) method. We examined the d-orbital energy (Md value) of these TMs, the orbital overlap population (OOP) between the d-orbital of these TMs and the 5f or 6d orbital of $$gamma$$-U, and the effective charge on each atom of the $$gamma$$-U/TM alloy, and the effect of these parameters on alloying. It was found that the maximum solid solubility of TMs into $$gamma$$-U was exponentially proportional to both the Md and the OOP (U5f-TMd and U6d-TMd). We found a good correlation between the MSS and Md, the effective charge, or OOP.

Journal Articles

Introduction to plasma fusion energy

Takamura, Shuichi*; Kado, Shinichiro*; Fujii, Takashi*; Fujiyama, Hiroshi*; Takabe, Hideaki*; Adachi, Kazuo*; Morimiya, Osamu*; Fujimori, Naoji*; Watanabe, Takayuki*; Hayashi, Yasuaki*; et al.

Kara Zukai, Purazuma Enerugi No Subete, P. 164, 2007/03

no abstracts in English

Journal Articles

Theoretical study on the alloying behavior of $$gamma$$-uranium metal; $$gamma$$-uranium alloy with 3d transition metals

Kurihara, Masayoshi*; Hirata, Masaru; Sekine, Rika*; Onoe, Jun*; Nakamatsu, Hirohide*

Journal of Nuclear Materials, 326(2-3), p.75 - 79, 2004/03

 Times Cited Count:12 Percentile:61.61(Materials Science, Multidisciplinary)

We have investigated the alloying behavior of g-uranium with 3d transition metals (TMs) using the relativistic discrete-variational Dirac-Fock-Slater (DV-DFS) method. The d-orbital energy (Md) as an alloying parameter well reproduces the alloying behavior of g- uranium metal with TMs: (1) in the case of a large Md value (Ti,V,Cr), the solubility of these TM elements in g-uranium becomes large; (2) in the case of a middle Md value (Mn,Fe,Co), the tendency to form a uranium intermetallic compound with these elements becomes stronger; (3) in the case of a small Md value (Cu), the alloying element is insoluble in g-uranium. The alloying behavior of g-uranium with TMs is also discussed in terms of other parameters such as electronegativity and metallic radius.

Journal Articles

Discrete-variational Dirac-Slater calculations on the valence band XPS for $$alpha$$-uranium metal

Kurihara, Masayoshi*; Hirata, Masaru; Sekine, Rika*; Onoe, Jun*; Nakamatsu, Hirohide*

Journal of Nuclear Materials, 281(2-3), p.140 - 145, 2000/10

 Times Cited Count:3 Percentile:26.46(Materials Science, Multidisciplinary)

no abstracts in English

Journal Articles

Discrete-variational Dirac-Slater calculation on valence band XPS for UC

Kurihara, Masayoshi*; Hirata, Masaru; Sekine, Rika*; Onoe, Jun*; Nakamatsu, Hirohide*; Mukoyama, Takeshi*; *

Journal of Alloys and Compounds, 283, p.128 - 132, 1999/00

 Times Cited Count:10 Percentile:59.69(Chemistry, Physical)

no abstracts in English

JAEA Reports

Japanese contribution of ITER PF systems design during CDA

Azumi, Masafumi; Hasegawa, Mitsuru*; *; Kurihara, Kenichi; Nakamura, Yukiharu; Nishio, Satoshi; Shimomura, Yasuo; Shinya, K.*; Sugihara, Masayoshi; *; et al.

JAERI-M 92-041, 100 Pages, 1992/03

JAERI-M-92-041.pdf:2.59MB

no abstracts in English

JAEA Reports

Mock-up apparatus for preparation of plutonium fuel solution for criticality experiments at NUCEF

Sakurai, Satoshi; Hirata, Masaru; ; Usuda, Shigekazu; Abe, Jiro; ; Tachimori, Shoichi; ; Kurihara, Masayoshi; Kobayashi, Iwao

JAERI-M 90-059, 35 Pages, 1990/03

JAERI-M-90-059.pdf:1.38MB

no abstracts in English

Journal Articles

Catalytic incineration of ion exchange resins using fluidized bed

Yahata, Taneaki; *; Hirata, Masaru; Kurihara, Masayoshi

Proc. of the 1989 Joint Int. Waste Management Conf., Vol. 1, p.75 - 80, 1989/00

no abstracts in English

JAEA Reports

Volume reduction of ion exchange resins by catalytic incineration; II, Bench scale test

Yahata, Taneaki; Hirata, Masaru; *; Kurihara, Masayoshi

JAERI-M 88-233, 29 Pages, 1988/11

JAERI-M-88-233.pdf:0.84MB

no abstracts in English

JAEA Reports

Volume reduction of ion exchange resins by catalytic incineration,I; Basic examination

Yahata, Taneaki; *; Kurihara, Masayoshi

JAERI-M 88-008, 25 Pages, 1988/01

JAERI-M-88-008.pdf:0.66MB

no abstracts in English

Oral presentation

Optimization of the viewing chord arrangement in the ITER poloidal polarimeter based on the MHD equilibrium reconstruction

Yamaguchi, Taiki; Kawano, Yasunori; Fujieda, Hirobumi; Kurihara, Kenichi; Sugihara, Masayoshi*; Kusama, Yoshinori

no journal, , 

no abstracts in English

Oral presentation

The Alloying behavior of transition-metal elements in $$gamma$$-uranium; Role of the d-d orbital interaction

Onoe, Jun*; Kurihara, Masayoshi*; Hirata, Masaru; Suzuki, Chikashi

no journal, , 

Oral presentation

Investigation of the influence of plasma inductance in the fast current decay of JT-60U disruptive discharges and verification of the current decay model

Shibata, Yoshihide*; Watanabe, Kiyomasa*; Okamoto, Masaaki*; Ono, Noriyasu*; Isayama, Akihiko; Kurihara, Kenichi; Oyama, Naoyuki; Nakano, Tomohide; Kawano, Yasunori; Matsunaga, Go; et al.

no journal, , 

no abstracts in English

Oral presentation

Verification of the current decay model in the high $$beta$$$$_{rm p}$$ disruptive discharges in JT-60U

Shibata, Yoshihide*; Watanabe, Kiyomasa*; Ono, Noriyasu*; Okamoto, Masaaki*; Isayama, Akihiko; Kurihara, Kenichi; Oyama, Naoyuki; Nakano, Tomohide; Kawano, Yasunori; Matsunaga, Go; et al.

no journal, , 

no abstracts in English

Oral presentation

Mutation induction in fragrance cyclamen "Uruwashi-no-kaori" by ion beam irradiation

Kondo, Emiko*; Kameari, Naoko*; Nakayama, Masayoshi*; Kurihara, Yasushi*; Akita, Yusuke; Tanikawa, Natsu*; Morita, Yasumasa*; Hase, Yoshihiro; Tanaka, Atsushi; Ishizaka, Hiroshi*

no journal, , 

no abstracts in English

28 (Records 1-20 displayed on this page)