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Journal Articles

Cavitation damage prediction in mercury target for pulsed spallation neutron source using Monte Carlo simulation

Wakui, Takashi; Takagishi, Yoichi*; Futakawa, Masatoshi

Materials, 16(17), p.5830_1 - 5830_16, 2023/09

https://doi.org/10.3390/ma16175830
 Times Cited Count：0 Percentile：0.00(Chemistry, Physical)

Cavitation damage on the mercury target vessel is induced by proton beam injection in mercury. The prediction method of the cavitation damage using Monte Carlo simulations was proposed taking into account of the uncertainties of the position of cavitation bubbles and impact pressure distributions. The distribution of impact pressure attributed to individual cavitation bubble collapsing was assumed to be the Gaussian distribution, and the probability distribution of the maximum value of impact pressures was assumed to be three kinds of distributions; the delta function, the Gaussian and Weibull distributions. Two parameters were estimated using Bayesian optimization by comparing the distribution of the cavitation damage obtained from experiment with that of accumulated plastic strain obtained from the simulation. It was found that the results obtained using the Weibull distribution reproduced the actual cavitation erosion phenomenon better than the other results.

Journal Articles

Continuous energy Monte Carlo criticality calculation of random media under power law spectrum

Ueki, Taro

Proceedings of International Conference on Mathematics and Computational Methods applied to Nuclear Science and Engineering (M&C 2019) (CD-ROM), p.151 - 160, 2019/00

A dynamical system under extreme physical disorder has the tendency of evolving toward the equilibrium state characterized by an inverse power law spectrum. In this paper, the author proposes a practically implementable modeling of random media under such a spectrum using a randomized form of the Weierstrass function. The proposed modeling is demonstrated by the continuous energy Monte Carlo particle transport with delta tracking for the criticality calculation of a randomized version of the Topsy spherical core in International Criticality Safety Benchmark Evaluation Project.

Journal Articles

$$delta f$$ simulations of microturbulence

Idomura, Yasuhiro

Purazuma, Kaku Yugo Gakkai-Shi, 81(8), p.581 - 592, 2005/08

http://ci.nii.ac.jp/naid/110006281959

A gyrokinetic particle simulation is a powerful tool in studying tokamak microturbulence. A $$delta f$$ method, which is a standard method in recent gyrokinetic particle simulations, dramatically improved an efficiency of a particle simulation by reducing a particle noise, and full torus turbulence simulations are enabled. In this paper, the $$delta f$$ method is reviewed, and issues in full torus gyrokinetic particle simulations are discussed.

Journal Articles

High recycling steady H-mode regime in the JFT-2M Tokamak

Kamiya, Kensaku; Bakhtiari, M.; Kasai, Satoshi; Kawashima, Hisato; Kusama, Yoshinori; Miura, Yukitoshi; Ogawa, Hiroaki; Oyama, Naoyuki; Sato, Masayasu; Shinohara, Koji; et al.

Plasma Physics and Controlled Fusion, 46(5A), p.A157 - A163, 2004/05

https://doi.org/10.1088/0741-3335/46/5A/017
 Times Cited Count：25 Percentile：59.78(Physics, Fluids & Plasmas)

A new operating regime, High Recycling Steady (HRS) H-mode regime, has been discovered on JFT-2M, which is easily reproduced under the wall fueling from the boronized first wall. Accompanying the HRS H-mode transition, the coherent magnetic and floating potential fluctuations are seen on magnetic probes at vessel wall and Langmuir probe in SOL, respectively. These coherent fluctuations have a frequency of the order of 10-100 kHz with significant variation, which is recognized to be important to enhance the particle transport. The HRS can be seen even at ${it q}$$$_{95}$$$$<$$3 with ${it n}$$$_{e}$$/${it n}$$$_{GW}$$$$>$$0.4 for the fixed delta$$sim$$0.4 in the standard single-null divertor configuration. Recent experimental results from JFT-2M show that the plasma shape also seems to play an important role in determining the type of ELMs. The HRS regime can be extended up to delta$$sim$$0.75 and ${it q}$$$_{95}$$$$sim$$2.6 in the double-null configuration, while lower delta boundary exists at delta$$sim$$0.3 with moderate ${it q}$$$_{95}$$$$sim$$4 even at high recycling and/or density condition of ${it n}$$$_{e}$$/${it n}$$$_{GW}$$$$>$$0.4.

JAEA Reports

Report of Examination of the Sample from Core Shroud (2F2-H3) at Fukushima Dai-ni Power Station Unit-2 (Contract research)

The Working Team for Examination of the Sample from Core Shrouds and Primary Loop Recirculation Pipi; Nakajima, Hajime*; Shibata, Katsuyuki; Tsukada, Takashi; Suzuki, Masahide; Kiuchi, Kiyoshi; Kaji, Yoshiyuki; Kikuchi, Masahiko; Ueno, Fumiyoshi; Nakano, Junichi; et al.

JAERI-Tech 2004-015, 114 Pages, 2004/03

JAERI-Tech-2004-015.pdf:38.06MB

The Tokyo Electric Power Company (TEPCO) visually inspected the weld joint of core shroud at Fukushima Dai-ni Nuclear Power Station Unit-2 by a direction of the Nuclear and Industrial Agency, cracks were observed at outer side of the ring weld joint (H3) between a core shroud middle trunk and a middle ring. TEPCO has conducted a material examination with Nippon Nuclear Fuel Development Co. Ltd. (NFD) on the specimen including cracks sampled from the core shroud. The present examination has been performed with the objective to independently investigate and evaluate the materials by jointly attending the examination with NFD from the planning stage. Based on results of the present examination, the probable presence of tensile residual stress by welding process and dissolved oxygen contents in the cooling water, it was shown that the cracks were considered to be stress corrosion cracking (SCC). However, the cause of the cracks needs more consideration on the way of shroud construction.

Journal Articles

Variation of $$^{14}$$C, $$^{137}$$Cs and stable carbon composition in forest soil and its implications

Guo, J.; Atarashi-Andoh, Mariko; Amano, Hikaru

Journal of Radioanalytical and Nuclear Chemistry, 255(1), p.223 - 229, 2003/01

https://doi.org/10.1023/A:1022281226010
 Times Cited Count：7 Percentile：44.43(Chemistry, Analytical)

Soil organic matter content, $$delta$$$$^{13}$$C, $$^{14}$$C and $$^{137}$$Cs radioactivity were determined in 3 undisturbed forest soil profiles in Ibaraki prefecture, Japan to estimate $$^{14}$$C migration in surface environment. The $$^{137}$$Cs data illustrate that no disturbance has occurred during past years in 3 soil profiles. The peak values are observed in the top 10 cm of the soil profiles. $$^{14}$$C activities were determined with fast bomb combustion-liquid scintillation counting method. $$^{14}$$C determination shows that $$^{14}$$C also has peak values in the top 10 cm of the soil profiles ascribed to the highest bomb $$^{14}$$C level in 1960's.$$delta$$$$^{13}$$C values continuously decreased with increasing soil depth. Enrichment of deeper soils in isotope ratio probably results from discrimination against $$^{13}$$C during mineralization and loss of isotopically lighter carbon from soils due to root uptake, leaching etc.It shows that $$delta$$$$^{13}$$C is an excellent indicator of soil carbon turnover and belowground process.

Journal Articles

Nature of vortex melting transition when the field is perpendicular to the c-axis of untwinned YBa$$_{2}$$Cu$$_{3}$$O$$_{6.94}$$

Ishida, Takekazu*; Okuda, Kiichi*; Asaoka, Hidehito

Physica B; Condensed Matter, 284-288(Part1), p.727 - 728, 2000/07

https://doi.org/10.1016/S0921-4526(99)02425-4
 Times Cited Count：0 Percentile：0.00(Physics, Condensed Matter)

no abstracts in English

Journal Articles

Does vortex lattice of YBa$$_{2}$$Cu$$_{3}$$O$$_{6.94}$$ in H$$bot$$C melt below intrinsic-pinning irreversibility line?

Ishida, Takekazu*; Okuda, Kiichi*; Asaoka, Hidehito

Journal of Low Temperature Physics, 117(5-6), p.1387 - 1391, 1999/12

no abstracts in English

Journal Articles

Critical scaling analysis of transport characteristics before and after heavy-ion irradiation in a YBa$$_{2}$$Cu$$_{3}$$O$$_{7-delta}$$ thin film

Sueyoshi, T.*; Ishikawa, Norito; Iwase, Akihiro; Chimi, Yasuhiro; Kisu, T.*; Fujiyoshi, T.*; Miyahara, K.*

Advances in Superconductivity XI, 1, p.593 - 596, 1999/00

no abstracts in English

Journal Articles

Interdiffusion in the U-Zr system at $$delta$$-phase compositions

Akabori, Mitsuo; Ito, Akinori; Ogawa, Toru;

Journal of Alloys and Compounds, 271-273, p.597 - 601, 1998/00

https://doi.org/10.1016/S0925-8388(98)00167-4
 Times Cited Count：16 Percentile：66.72(Chemistry, Physical)

no abstracts in English

Journal Articles

Experimental study of high-power millimeter wave transmission of sapphire window for electron cyclotron range of frequencies system

Kasugai, Atsushi; Takahashi, Koji; Sakamoto, Keishi; Yamamoto, Takumi; Tsuneoka, Masaki; Kariya, Tsuyoshi*; Imai, Tsuyoshi

Japanese Journal of Applied Physics, Part 1, 36(5A), p.2883 - 2887, 1997/00

https://doi.org/10.1143/JJAP.36.2883
 Times Cited Count：5 Percentile：32.10(Physics, Applied)

no abstracts in English

Journal Articles

Temperature effects on radiation induced phenomena in polytetrafluoroethylene (PTFE); Change of G-value

; Ikeda, Shigetoshi*; Kudo, Hisaaki; Seguchi, Tadao; Tabata, Yoneho*

Radiation Physics and Chemistry, 50(6), p.611 - 615, 1997/00

https://doi.org/10.1016/S0969-806X(97)00103-5
 Times Cited Count：61 Percentile：95.62(Chemistry, Physical)

no abstracts in English

Journal Articles

High temperature $$gamma$$-ray irradiation effects of varnish wires

Yagi, Toshiaki; Morita, Yosuke; Seguchi, Tadao; ; ;

DEI-95-128, 0, p.39 - 48, 1995/12

no abstracts in English

Journal Articles

Gas separation performance of a hollow-filament type polyimide membrane medule for a compact tritium removal system

Hayashi, Takumi; Yamada, Masayuki; Suzuki, Takumi; Matsuda, Yuji; Okuno, Kenji

Fusion Technology, 28(3), p.1503 - 1508, 1995/10

no abstracts in English

Journal Articles

c-axis microwave conductivity of YBa$$_{2}$$Cu$$_{3}$$O$$_{7-delta}$$ in the superconducting state

; ; ; Maeda, A.*; Asaoka, Hidehito;

Physical Review B, 51(2), p.1401 - 1405, 1995/01

https://doi.org/10.1103/PhysRevB.51.1401
 Times Cited Count：42 Percentile：82.10(Materials Science, Multidisciplinary)

no abstracts in English

Journal Articles

High power experiment of MM wave transmission with sapphire

Kasugai, Atsushi; Takahashi, Koji; Sakamoto, Keishi; Tsuneoka, Masaki; Kariya, Tsuyoshi*; Imai, Tsuyoshi

Conf. Digest; 20th Int. Conf. on Infrared and Millimeter Waves, 0, p.18 - 19, 1995/00

no abstracts in English

Journal Articles

Lattice stability and structure of $$delta$$-UZr$$_{2}$$ at elevated temperatures

Akabori, Mitsuo; Ogawa, Toru; Ito, Akinori; Morii, Yukio

Journal of Physics; Condensed Matter, 7, p.8249 - 8257, 1995/00

https://doi.org/10.1088/0953-8984/7/43/005
 Times Cited Count：55 Percentile：91.19(Physics, Condensed Matter)

no abstracts in English

Journal Articles

Statistical analyses of variability/reproducibility of environmentally-assisted cyclic crack growth rate data relative to $$Delta$$K control modes

Tsuji, Hirokazu; ; Nakajima, Hajime; Kondo, Tatsuo

Journal of Nuclear Materials, 202, p.79 - 86, 1993/00

https://doi.org/10.1016/0022-3115(93)90031-S
 Times Cited Count：1 Percentile：18.45(Materials Science, Multidisciplinary)

no abstracts in English

Journal Articles

In-situ observation of an austenitic stainless steel weld joint during helium irradiation

Hamada, Shozo; Hojo, Kiichi; Hishinuma, Akimichi

Journal of Nuclear Materials, 205, p.219 - 224, 1993/00

https://doi.org/10.1016/0022-3115(93)90084-C
 Times Cited Count：3 Percentile：37.38(Materials Science, Multidisciplinary)

no abstracts in English

Journal Articles

Crystal structure determination of Pb$$_{2}$$Sr$$_{2}$$YCu$$_{3}$$O$$_{8+delta}$$($$delta$$=0,1.67) by powder neutron diffraction

; ; Morii, Yukio; Funahashi, Satoru

Physica C, 210, p.529 - 535, 1993/00

https://doi.org/10.1016/0921-4534(93)90999-7
 Times Cited Count：5 Percentile：33.52(Physics, Applied)

no abstracts in English

42 (Records 1-20 displayed on this page)