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Journal Articles

Monte Carlo criticality analysis of random media under bounded fluctuation driven by normal noise

Ueki, Taro

Journal of Nuclear Science and Technology, 55(10), p.1180 - 1192, 2018/10

AA2018-0157.pdf:1.15MB

https://doi.org/10.1080/00223131.2018.1483846

Times Cited Count：4 Percentile：38.58(Nuclear Science & Technology)

In Monte Carlo criticality analysis under material distribution uncertainty, it is necessary to evaluate the response of neutron effective multiplication factor ( $K_{rm eff}$ ) to the space-dependent random fluctuation of volume fractions within a prescribed bounded range. Normal random variables, however, cannot be used in a straightforward manner since the normal distribution has infinite tails. To overcome this issue, a methodology has been developed via forward-backward-superposed reflection Brownian motion (FBSRBM). Here, the forward-backward superposition makes the variance of fluctuation spatially constant and the reflection Brownian motion confines the fluctuation driven by normal noise in a bounded range. FBSRBM was implemented using Karhunen-Loeve expansion and applied to the fluctuation of volume fractions in a model of UO $_{2}$ -concrete media with stainless steel.

Journal Articles

Evidence for a hard gap and Wigner lattice in heavily boron-doped synthetic diamond

Sudo, Tomoko*; Ohashi, Kazutoshi*; Sato, Toshimaro*; Ota, Eiji*; Okayasu, Satoru; Sugai, Hiroyuki

Physical Review B, 71(4), p.045211_1 - 045211_7, 2005/01

https://doi.org/10.1103/PhysRevB.71.045211

Times Cited Count：1 Percentile：7.2(Materials Science, Multidisciplinary)

We have measured low frequency generation-recombination noise (g-r moise) spectra of a heavily boro-doped diamond crystal over the temperature range 20-300 K. The experimental results show that there are two peaks in the g-r noise spectrum at 120 K and 67 K, respectively. The 120 K peak corresponds to experimental evidence for the existence of hard gap having width of 10.4 meV. We interpret the 67 K peak as evidence for Wigner lattice formation whose gap width is 5.8 meV.

Journal Articles

Remodeling of diagnostics timing system for JT-60 degassing operation

Oshima, Takayuki; Iwasaki, Keita*; Shimizu, Kazuaki

Heisei-14-Nendo Tokyo Daigaku Sogo Gijutsu Kenkyukai Gijutsu Hokokushu, 3 Pages, 2003/03

no abstracts in English

Journal Articles

Countermeasures against the electoric noise in the JT-60 gas injection system

Miyo, Yasuhiko; Hiratsuka, Hajime; Iwahashi, Takaaki*; Honda, Masao

NIFS-MEMO-36, p.339 - 342, 2002/06

no abstracts in English

Journal Articles

Fundamental test results of grounding conductor with attenuator for high frequency noise

Okada, Kenichi*; Tsuneoka, Masaki; Murano, Yoshihiro*; Okawa, Yoshinao

Denki Setsubi Gakkai-Shi, 22(2), p.151 - 158, 2002/02

http://ci.nii.ac.jp/naid/10007998516

no abstracts in English

JAEA Reports

Investigation and measures to noise on spectroscopic measurement system in JT-60U

; *; *; *; Kubo, Hirotaka; Sugie, Tatsuo

JAERI-Tech 97-062, 21 Pages, 1997/11

JAERI-Tech-97-062.pdf:0.89MB

no abstracts in English

Journal Articles

Neutral particle analyzer with energy range up to 4MeV for both alpha particles and protons

Kusama, Yoshinori; Nemoto, Masahiro; Afanassiev, V. I.*; Kozlovskij, S. S.*; Petrov, S. Y.*; Sato, Minoru; Morioka, Atsuhiko; Tsukahara, Yoshimitsu; A.I.Kislyakov*; M.P.Petrov*; et al.

Fusion Engineering and Design, 34-35, p.531 - 534, 1997/03

https://doi.org/10.1016/S0920-3796(96)00583-2

Times Cited Count：8 Percentile：56.36(Nuclear Science & Technology)

no abstracts in English

Journal Articles