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Shear stabilization of drift dissipative instabilities

M. Gregoire, P. Rolland1973年被引用 2Nuclear FusionIF 3出版社

A linear hard-core configuration is used in a study of shear stabilization of drift dissipative instabilities. A neutral-collision-dominated hydrogen plasma with ne = 1011 cm−3, Te = 10 eV and Ti ≃ 1 eV with a neutral gas pressure between 10−3 and 3 × 10−3 torr is produced. The spatial mode structure and dependence of the stabilization upon axial magnetic field, pressure and shear are investigated by using correlation techniques. It is found that in the presence of shear the waves retain a drift wave structure (k|| ≃ 0), while the radial mode is essentially the lowest-order normal mode. A theory is developed which takes into account the collisional mechanism as well as axial ion motion. The stabilizing effect of the magnetic field is in quantitative agreement with the theory. A derived stabilization law which depends upon neutral pressure explains the experimental observation of either a normal-mode structure or a convective-noise-like pattern.

日本語訳

線形ハードコア配置を用いて、ドリフト散逸性不安定性のシアー安定化を研究した。中性粒子衝突支配の水素プラズマ(ne = 1011 cm−3、Te = 10 eV、Ti ≃ 1 eV、中性ガス圧力 10−3〜3 × 10−3 torr)を生成した。空間モード構造と、軸方向磁場、圧力、シアーに対する安定化の依存性を、相関法を用いて調べた。シアーの存在下では、波はドリフト波構造(k|| ≃ 0)を保持する一方、動径モードは本質的に最低次のノーマルモードであることが見出された。衝突機構と軸方向イオン運動の両方を考慮した理論を構築した。磁場の安定化効果は理論と定量的に一致した。導出された安定化則は中性ガス圧力に依存し、ノーマルモード構造または対流的ノイズ様パターンのいずれかの実験的観測を説明する。

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