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Rotation effect on geodesic and zonal flow modes in tokamak plasmas with isothermal magnetic surfaces

A G Elfimov, R M O Galvão, R J F Sgalla2011年Plasma Physics and Controlled FusionIF 2.2出版社

The electrostatic geodesic mode oscillations are investigated in rotating large aspect ratio tokamak plasmas with circular isothermal magnetic surfaces. The analysis is carried out within the magnetohydrodynamic model including heat flux to compensate for the non-adiabatic pressure distribution along the magnetic surfaces in plasmas with poloidal rotation. Instead of two standard geodesic modes, three geodesic continua are found. The two higher branches of the geodesic modes have a small frequency up-shift from ordinary geodesic acoustic and sonic modes due to rotation. The lower geodesic continuum is a new zonal flow mode (geodesic Doppler mode) in plasmas with mainly poloidal rotation. Limits to standard geodesic modes are found. Bifurcation of Alfvén continuum by geodesic modes at the rational surfaces is also discussed. Due to that, the frequency of combined geodesic continuum extends from the poloidal rotation frequency to the ion-sound band that can have an important role in suppressing plasma turbulence.

日本語訳

静電的な測地線モードの振動は、円形の等温磁気面を有する大型アスペクト比トカマクプラズマにおいて、回転を伴う条件下で調査される。解析は、プラズマのポロイダル回転を伴う磁気面に沿った非断熱圧力分布を補償するための熱流束を含む磁気流体力学モデルを用いて行われる。標準的な2つの測地線モードの代わりに、3つの測地線連続体が見出される。高い方の2つの分岐は、回転による通常の測地線音響モードおよび測地線音波モードからの小さな周波数上昇を示す。低い方の測地線連続体は、主にポロイダル回転を有するプラズマにおける新たな帯状流モード(測地線ドップラーモード)である。有理面上の測地線モードによるアルヴェン連続体の分岐についても議論される。これにより、複合測地線連続体の周波数は、ポロイダル回転周波数からイオン音波帯域にまで及ぶこととなり、プラズマ乱流の抑制において重要な役割を果たし得る。

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