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Idomura, Yasuhiro
Europhysics Conference Abstracts (Internet), 45A, 4 Pages, 2021/06
This work presents the impacts of the hydrogen isotope mass and the normalized plasma size on confinement of hydrogen (H) and deuterium (D) plasmas dominated by ion temperature gradient driven turbulence. Numerical experiments of H and D plasmas with ion and electron heating conditions were conducted using the Gyrokinetic Toroidal 5D full- f Eulerian code GT5D. The energy confinement time in the ion heated numerical experiments was almost independent of isotope mass, and the energy confinement was determined mainly by the normalized plasma size or the plasma size divided by the ion gyro radius, indicating an impact of non-local transport. On the other hand, the electron heated numerical experiments showed a clear isotope mass dependency. In addition to the plasma size effect, the isotope mass dependency of the collisional energy transfer from electrons to ions changes the ion heat flux and the turbulence intensity, leading to the degradation of confinement in H plasmas. These results qualitatively agree with the hydrogen isotope scaling in experiments.
Chikhray, Y.*; Askerbekov, S.*; Kenzhin, Y.*; Gordienko, Y.*; Ishitsuka, Etsuo
Fusion Science and Technology, 76(4), p.494 - 502, 2020/05
Times Cited Count:1 Percentile:12.16(Nuclear Science & Technology)Idomura, Yasuhiro
Physics of Plasmas, 26(12), p.120703_1 - 120703_5, 2019/12
Times Cited Count:5 Percentile:33.86(Physics, Fluids & Plasmas)This Letter presents the impacts of the hydrogen isotope mass and the normalized gyroradius on L-mode like hydrogen (H) and deuterium (D) plasmas dominated by ion temperature gradient driven (ITG) turbulence using global full-f gyrokinetic simulations. In ion heated numerical experiments with adiabatic electrons, the energy confinement time shows almost no isotope mass dependency, and is determined by Bohm like scaling. Electron heated numerical experiments with kinetic electrons show clear isotope mass dependency caused by the isotope effect on the collisional energy transfer from electrons to ions, and the H and D plasmas show similar ion and electron temperature profiles at an H to D heating power ratio of . The normalized collisionless ion gyrokinetic equations for H and D plasmas become identical at the same , and collisions weakly affect ITG turbulence. Therefore, the isotope mass dependency is mainly contributed by the scaling and the heating sources.
Tanigawa, Hisashi; Tanaka, Satoru*; Enoeda, Mikio; Akiba, Masato
Journal of Nuclear Materials, 329-333(2), p.1291 - 1294, 2004/08
Times Cited Count:4 Percentile:29.26(Materials Science, Multidisciplinary)In order to elucidate the interaction of hydrogen isotopes with irradiation defects, infrared absorption spectroscopy was conducted for a single crystal of LiO. Using FT-IR, O-D stretching vibration from the bulk LiO was observed under deutron irradiation. Under and after the irradiation, several peaks were observed in the O-D stretching vibration region and these peaks had different dependence on conditions of the irradiation. From the observed behaviour of the peaks, it was suggested that most of the irradiated deutron existed in LiO without O-D bonding because of interaction with the defects.
Mironov, M. I.*; Khudoleev, A. V.*; Kusama, Yoshinori
Plasma Physics Reports, 30(2), p.164 - 168, 2004/02
Times Cited Count:0 Percentile:0.02(Physics, Fluids & Plasmas)High-energy charge-exchange diagnostics can determine the distribution function of fast atoms produced via the neutralization of hydrogen ions by hydrogen-like impurity ions. Deriving the distribution function requires to know the composition and spatial distribution of the target ions in a plasma. A charge-exchange target forms as a result of the interaction between impurity nuclei and beam atoms. Depending on the arrangement of heating beams with respect to the diagnostics, it is necessary to calculate their trajectories. A model which takes into account elementary processes resulting in the ionization equilibrium of the ions of impurities in a specific tokamak configuration is proposed. The model is applied to the JT-60U plasma. Mechanisms for the formation of charge-exchange atomic flows are considered. The relative contributions of different heating injectors to the charge-exchange flow are estimated. Based on the calculated results, a method is proposed for local measurements of the ion distribution function with a stationary analyzer.
JT-60 Team
JAERI-Review 2003-029, 197 Pages, 2003/11
no abstracts in English
Nakamura, Hirofumi; Hayashi, Takumi; Kakuta, Toshiya*; Suzuki, Takumi; Nishi, Masataka
Journal of Nuclear Materials, 297(3), p.285 - 291, 2001/09
Times Cited Count:17 Percentile:74.85(Materials Science, Multidisciplinary)The isotope effect on the implantation-driven permeation of pure tritium (T) and deuterium (D) through nickel was investigated, respectively. The rate-determining processes of backward flow at the upstream surface and permeation at the down-stream surface were found to be as follows: recombination on up-stream surface and diffusion at down-stream side in a lower temperature region, whereas recombination on both surfaces in a higher temperature region for T and D, respectively. The diffusion coefficients of T and D derived by analyzing the obtained transient data of permeation in the lower temperature region were in good agreement with literature data of deuterium. The obtained activation energy of diffusion for T and D suggested the tendency of mass dependence. The surface recombination coefficients for both isotopes were also derived and showed in good agreement with literature data. As a result, the experimental results indicated the surface recombination could be attributed to the isotope effect of the permeation between T and D rather than the diffusion.
Noguchi, Hiroshi
Fusion Technology, 27(2T), p.56 - 61, 1995/03
no abstracts in English
JAERI-Conf 94-004, 187 Pages, 1994/11
no abstracts in English
Okuno, Kenji; *; Ohira, Shigeru; Naruse, Yuji
Journal of Nuclear Science and Technology, 28(6), p.509 - 516, 1991/06
no abstracts in English
Noguchi, Hiroshi; Murata, Mikio
Nihon Genshiryoku Gakkai-Shi, 33(4), p.360 - 362, 1991/04
Times Cited Count:2 Percentile:51.2(Nuclear Science & Technology)no abstracts in English
*; *; *; *; *; Sengoku, Seio; Otsuka, Hideo; Maeda, Hikosuke
JAERI-M 91-048, 57 Pages, 1991/03
no abstracts in English
*; *; *; ; ; Ono, Shinichi; Saeki, Masakatsu; Tachikawa, Enzo
Bulletin of the Chemical Society of Japan, 60, p.3835 - 3842, 1987/00
Times Cited Count:5 Percentile:43.76(Chemistry, Multidisciplinary)no abstracts in English
; ;
Fresenius' Z.Anal.Chem., 323, p.225 - 227, 1986/00
None
; ; J.R.Bartlit*; R.H.Sherman*
Fusion Technology, 10, p.137 - 148, 1986/00
no abstracts in English
; ;
Fusion Technology, 10, p.462 - 473, 1986/00
no abstracts in English
Fusion Technology, 9, p.492 - 498, 1986/00
no abstracts in English
;
JAERI-M 85-157, 19 Pages, 1985/10
no abstracts in English
;
Bunseki Kagaku, 34(11), p.677 - 681, 1985/00
no abstracts in English
Journal of Nuclear Materials, 136, p.1 - 5, 1985/00
Times Cited Count:31 Percentile:94.05(Materials Science, Multidisciplinary)no abstracts in English