Numerical analyses of core heat transport in plasmas with different toroidal rotation profiles in JT-60U

Narita, Emi*; Honda, Mitsuru; Hayashi, Nobuhiko; Urano, Hajime; Ide, Shunsuke; Fukuda, Takeshi*

In long-pulse ELMy H-mode plasmas with parabolic type ITB plasmas, it has been found that the direction of toroidal rotation influences the internal transport barrier of the electron temperature: the gradient of the temperature becomes steeper with increasing rotation in the co direction with respect to the plasma current. These plasmas have the normal magnetic shear, and the radial electric field shear in the core region is weak. In this study, core heat transport in these plasmas is analyzed with the gyrokinetic code GS2. As a result of the linear calculations, the difference in the real frequencies is found. Using these linear calculation results, the ratio of electron heat flux to ion's () is estimated with a quasilinear transport model. This estimation shows that the ratio is lower in co-rotating plasma. This result agrees with experimental observation. The influence of the shear in toroidal rotation on the linear growth rates is also discussed.