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Rewoldt, G.*; Lin, Z.*; Idomura, Yasuhiro
Computer Physics Communications, 177(10), p.775 - 780, 2007/11
Times Cited Count：42 Percentile：84.19(Computer Science, Interdisciplinary Applications)Three codes that solve the gyrokinetic equation in toroidal geometry are compared in the linear limit for the growth rates and real frequencies of the ion temperature gradient (ITG) mode and the trapped electron mode (TEM). The three codes are the gyrokinetic toroidal code (GTC) and GT3D, both of which are radially-global particle-in-cell initial value codes, and FULL, which is a radially-local continuum eigenvalue code. With the same standard input parameters on a reference magnetic surface, the three codes give good agreement for the linear eigenfrequencies, both without (i.e., with adiabatic electron response) and with trapped electrons, as the perpendicular wavenumber and the ion temperature gradient input parameters are varied.
Sakamoto, Yoshiteru; Suzuki, Takahiro; Ide, Shunsuke; Koide, Yoshihiko; Takenaga, Hidenobu; Kamada, Yutaka; Fujita, Takaaki; Fukuda, Takeshi; Takizuka, Tomonori; Shirai, Hiroshi; et al.
Nuclear Fusion, 44(8), p.876 - 882, 2004/08
Times Cited Count：33 Percentile：71.1(Physics, Fluids & Plasmas)Response of the ion thermal diffusivity to the radial electric field Er shear has been investigated in JT-60U and the following results were found. (1) In the case of positive magnetic shear (PS) plasma, the ion thermal diffusivity in the core region shows L mode state, weak internal transport barrier (ITB), and strong ITB depending upon the heating power. In the case of reversed magnetic shear (RS) plasma, however, no power degradation of the ion thermal diffusivity is observed. (2) In the case of weak ITB, the ion thermal diffusivity decreases gradually with increasing the Er shear for both PS and RS plasmas. There exists a threshold of an effective Er shear to change its state from weak to strong ITBs. (3) The threshold of the effective Er shear in the case of RS plasma is small compared with that in the case of PS plasma.
Takenaga, Hidenobu; Higashijima, Satoru; Oyama, Naoyuki; Bruskin, L. G.; Koide, Yoshihiko; Ide, Shunsuke; Shirai, Hiroshi; Sakamoto, Yoshiteru; Suzuki, Takahiro; Hill, K. W.*; et al.
Nuclear Fusion, 43(10), p.1235 - 1245, 2003/10
Times Cited Count：71 Percentile：88.64(Physics, Fluids & Plasmas)no abstracts in English
Rewoldt, G.*; Hill, K. W.*; Nazikian, R. M.*; Tang, W. M.*; Shirai, Hiroshi; Sakamoto, Yoshiteru; Kishimoto, Yasuaki; Ide, Shunsuke; Fujita, Takaaki
Nuclear Fusion, 42(4), p.403 - 411, 2002/04
Times Cited Count：9 Percentile：30.39(Physics, Fluids & Plasmas)One class of internal transport barrier discharge in the JT-60U tokamak is characterized by two relatively flat regions of the pressure separated by a region with very large pressure gradient. Linear growth rates for toroidal drift type modes are calculated for discharges in this class, without and with sheared 
rotation effects. For cases with fully developed barriers, the results with rotation are consistent with a picture in which the radial electric field generated in part by the steep pressure gradient causes local stabilization, and thus reduction of the local anomalous transport, which allows the steep pressure gradient to persist. If rotation is omitted from the calculation for these cases, or if rotation is included for cases without barriers or with partially developed barriers, the unstable region spreads into the steep pressure gradient region.
shearing in improved confinement regimes in JT-60UShirai, Hiroshi; Kikuchi, Mitsuru; Takizuka, Tomonori; Fujita, Takaaki; Koide, Yoshihiko; Rewoldt, G.*; Mikkelsen, D. R.*; Budny, R.*; Tang, W. M.*; Kishimoto, Yasuaki; et al.
Fusion Energy 1998, 2, p.405 - 412, 1999/00
no abstracts in English
Shirai, Hiroshi; Kikuchi, Mitsuru; Takizuka, Tomonori; Fujita, Takaaki; Koide, Yoshihiko; Rewoldt, G.*; Mikkelsen, D. R.*; Budny, R.*; Tang, W. M.*; Kishimoto, Yasuaki; et al.
Nuclear Fusion, 39(11Y), p.1713 - 1722, 1999/00
Times Cited Count：68 Percentile：87.07(Physics, Fluids & Plasmas)no abstracts in English
