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Honda, Mitsuru; Satake, Shinsuke*; Suzuki, Yasuhiro*; Matsunaga, Go; Ide, Shunsuke; Yoshida, Maiko; Hayashi, Nobuhiko
no journal, ,
Yagi, Masatoshi; Matsuyama, Akinobu; Wakasa, Arimitsu*; Nuga, Hideo
no journal, ,
Ozeki, Takahisa; Clement, L. S.*; Nakajima, Noriyoshi*
no journal, ,
Seto, Haruki; Fukuyama, Atsushi*
no journal, ,
Nakata, Motoki; Honda, Mitsuru; Yoshida, Maiko; Urano, Hajime; Maeyama, Shinya; Nunami, Masanori*; Watanabe, Tomohiko*
no journal, ,
First-principle based gyrokinetic simulation is a promising approach for investigating turbulent transport in future burning plasmas such as ITER an DEMO. In this study, ITG-TEM driven turbulent transport simulations on the realistic JT-60U tokamak equilibrium are realized by using a local gyrokinetic turbulence code GKV-J. Linear micro-stability analyses on several radial locations revealed that ITG, ITG-TEM, and TEM modes are dominant for inner, middle, and outer core regions, respectively. The nonlinear turbulence simulation results successfully reproduce the experimental results on ion and electron heat diffusivity in the core region, where the conventional fluid-type reduced transport model shows some deviations. Also, different nonlinear dependences of the turbulence/zonal-flow energy on the ion/electron heat and particle transport levels are newly identified, i.e., weaker impact on the electron heat and particle transport compared to the ion heat one.
Aiba, Nobuyuki; Hirota, Makoto*; Shiraishi, Junya
no journal, ,
A mechanism exciting magnetohydrodynamic (MHD) instabilities in rotating tokamak plasmas is found numerically for the first time. This mechanism is the interplay between a resistive wall mode (RWM) and a stable MHD mode. When the plasma has a stable discrete eigenmode, a reversed shear Alfvn eigenmode (RSAE) for example, a MHD mode is destabilized when plasma equilibrium rotation frequency is similar to the frequency of this stable eigenmode in a static equilibrium. This destabilization is also observed even when the eigenmode couples with Alfvn continua. This result suggests that for steady state high beta tokamaks, like DEMO, it is necessary to shape the safety factor profile in such a way that no stable eigenmode exists in the band of rotation frequency.