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- Material Type
- 規格・テクニカルリポート類
- Author/Editor
- 宮戸 直亮岸本 泰明Li, J.
- Author Heading
- Publication Date
- 2004-08
- Publication Date (W3CDTF)
- 2004
- Alternative Title
- Global characteristics of zonal flows generated by ion temperature gradient driven turbulence in tokamak plasmas
- Periodical title
- JAERI-Research 2004-010
- Target Audience
- 一般
- Note (General)
- 出版タイプ： NAGlobal structure of zonal flows driven by ion temperature gradient driven turbulence in tokamak plasmas is investigated using a global electromagnetic Landau fluid code. Characteristics of the coupled system of the zonal flows and the turbulence change with the safety factor {\it q}. In a low {\it q} region stationary zonal flows are excited and suppress the turbulence effectively. Coupling between zonal flows and poloidally asymmetric pressure perturbations via a geodesic curvature makes the zonal flows oscillatory in a high {\it q} region. Also we identify energy transfer from the zonal flows to the turbulence via the poloidally asymmetric pressure perturbations in the high {\it q} region. Therefore in the high {\it q} region the zonal flows cannot quench the turbulet transport completely.トカマクプラズマの閉じ込め改善には帯状流による乱流輸送の抑制が不可欠である。トカマクプラズマ中の帯状流の性質は安全係数により変わることが知られていたが、そのグローバルな変化と乱流との相互作用は調べられていなかった。グローバル電磁ランダウ流体コードを用いて、イオン系の乱流輸送を支配していると考えられるイオン温度勾配乱流とそれによって生成される帯状流との間の相互作用をプラズマ全体にわたって解析した。帯状流が静的な安全係数が低い領域では乱流は効果的に抑制される。一方、帯状流が振動する安全係数が高い領域では、帯状流のエネルギーがポロイダル非対称な圧力揺動を介して乱流に輸送されるため、乱流はあまり抑制されない。