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Toroidicity effects in electrostatic drift wave turbulence in Tokamaks. II. The incoherent response

W Y Zhang, R Balescu1987年Plasma Physics and Controlled FusionIF 2.2出版社

For pt. I see ibid., vol.29, no.8, pp.993-1018 (1987). The concept of clumps is used in the Tokamak turbulence theory. Using the Misguich-Balescu stochastic orbit treatment (1985), the two-point fluctuation correlation equation is studied in detail. It is shown that the Hirshman-Molvig effect (1979) has a special influence on the clumps theory: the general quasilinear diffusion regime does not exist in Tokamaks. It is found that the clumps cannot be considered only as a destabilizing mechanism ('clumps-induced instability'), the presence of Delta omega (the frequency width at fixed wavenumber) stabilizes the plasma. It is also shown that Delta omega approximately omega c> omega as a result of the Hirshman-Molvig effect on the propagator. The saturation appears as a result of the balance between the clumps and the ion Compton scattering. The fluctuation spectrum is estimated, the large ktheta asymptotic form is ktheta -103/.

日本語訳

要約: ibid.、vol.29、no.8、pp.993-1018(1987年)を参照のこと。クランプの概念は、トカマク乱流理論において用いられる。Misguich-Balescuの確率軌道法(1985年)を用いて、二点揺動相関方程式を詳細に研究する。Hirshman-Molvig効果(1979年)がクランプ理論に特別な影響を与えることが示される:一般的な準線形拡散領域はトカマクには存在しない。クランプは単なる不安定化機構(「クランプ誘起不安定性」)とはみなせず、Δω(固定波数における周波数幅)の存在がプラズマを安定化することが見出される。また、Hirshman-Molvig効果が伝播子に及ぼす結果として、Δω≈ω_c>ωであることも示される。飽和は、クランプとイオン・コンプトン散乱の間のバランスの結果として現れる。揺動スペクトルが推定され、大きなk_θに対する漸近形はk_θ^{-10/3}である。

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Drift wavesDrift wave turbulence
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