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Global stability analysis of ITG modes in the presence of a field-aligned ion flow

M C Varischetti, M Lontano, L Valdettaro, E Lazzaro2008年Plasma Physics and Controlled FusionIF 2.2出版社

The linear stability analysis of the ITG modes in a plasma slab with an equilibrium ion flow has been carried out by solving the relevant eigenvalue equation for the complex electrostatic fluctuation amplitude , by retaining the electric, the diamagnetic and the gravitational-like drifts. For sufficiently broad Ti profiles, a novel regime with two-branch distributions of unstable eigenvalues has been found, which seems to be characterized by a broad radial correlation length. The plasma density profile and a macroscopic ion flow aligned to the magnetic field govern the relative importance of the two unstable sets of eigenfunctions.

日本語訳

プラズマスラブ中のITGモードの線形安定性解析を、平衡イオン流を伴う条件下で、複素静電揺動に対する関連する固有値方程式を解くことにより実施した。ここでは、電気的ドリフト、磁気的ドリフト、および重力様ドリフトを考慮した。十分に広いイオン温度勾配(Ti)プロファイルに対して、不安定固有値の二分枝分布を持つ新規なレジームが見出され、これは広い径方向相関長によって特徴づけられるようである。プラズマ密度プロファイルと磁場に沿った巨視的イオン流は、二組の不安定固有関数の相対的重要度を決定する。

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