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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.
OTanigawa, Hisashi; Tanaka, Satoru*; Enoeda, Mikio; Akiba, Masato
Journal of Nuclear Materials, 329-333(2), p.1291 - 1294, 2004/08
Times Cited Count：4 Percentile：28.83(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.
9, 1994, Tokai, JapanJAERI-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
; ; ; ; ; Ono, Shinichi; Saeki, Masakatsu; Tachikawa, Enzo
Bulletin of the Chemical Society of Japan, 60, p.3835 - 3842, 1987/00
Times Cited Count：5 Percentile：43.58(Chemistry, Multidisciplinary)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
; ; J.R.Bartlit*; R.H.Sherman*
Fusion Technology, 10, p.137 - 148, 1986/00
no abstracts in English
;
JAERI-M 85-157, 19 Pages, 1985/10
no abstracts in English
; Ozawa, K.; Nakai, Y.;
JAERI-M 84-093, 59 Pages, 1984/05
no abstracts in English
Journal of Nuclear Science and Technology, 21(4), p.299 - 307, 1984/00
Times Cited Count：5 Percentile：50.92(Nuclear Science & Technology)no abstracts in English
; Konishi, Satoshi; Naruse, Yuji
Nucl.Technol./Fusion, 3, p.471 - 484, 1983/00
no abstracts in English
; ; Murakami, Yoshio
JAERI-M 82-037, 48 Pages, 1982/04
no abstracts in English
Idomura, Yasuhiro
no journal, ,
Hydrogen isotope mixing phenomena in tokamak plasmas are analyzed using a full-f gyrokinetic model. Numerical experiments based on the hydrogen isotope mixing experiment on JET are conducted using plasma profiles before and after deuterium (D) pellet injection into a hydrogen (H) plasma. Before the injection, the density profiles of bulk H ions are maintained in a quasi-steady state. However, after the injection, the density profiles of bulk H and pellet D ions exhibit transient relaxation on the energy confinement time scale, indicating hydrogen isotope mixing. The balance of toroidal angular momentum shows that hydrogen isotope mixing is driven by toroidal electric field stress.
