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Experimental analyses and predictive simulations of toroidal rotation driven by the neoclassical toroidal viscosity in tokamaks

トカマクの新古典トロイダル粘性が駆動するトロイダル回転の実験解析と予測シミュレーション

本多 充; 佐竹 真介*; 鈴木 康浩*; 松永 剛; 篠原 孝司; 井手 俊介; 吉田 麻衣子; 浦野 創; 林 伸彦

Honda, Mitsuru; Satake, Shinsuke*; Suzuki, Yasuhiro*; Matsunaga, Go; Shinohara, Koji; Ide, Shunsuke; Yoshida, Maiko; Urano, Hajime; Hayashi, Nobuhiko

For simulations of toroidal rotation driven by the neoclassical toroidal viscosity (NTV), the framework of the collaborative execution of the integrated code TOPICS with the 3D equilibrium code VMEC and the 3D neoclassical transport code FORTEC-3D has been developed and improved. In tokamaks, toroidally-asymmetric components of the magnetic field exist and they produce the NTV, which generally slows down toroidal rotation. In JT-60SA H-mode plasmas, somewhat significant impact of the NTV on toroidal rotation is observed and the reversal of the NTV due to the change in the sign of the radial electric field $$E_r$$ is found in the pedestal. Our framework has been applied to JT-60U analyses. The NTV scales as the perturbed magnetic field strength and the peak of the NTV coincides with the location where $$E_r=0$$. The NTV torque is found to be imperative for explaining edge rotation.

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