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Magnetic and electrostatic fluctuations in the CASTOR tokamak

J Stöckel, J Badalec, I Duran, M Hron, J Horácek, K Jakubka, L Kryska, J Petrzílka, F Zácek, M V P Heller1999年Plasma Physics and Controlled FusionIF 2.2出版社

Magnetic and electrostatic fluctuations are measured in the CASTOR tokamak with a reasonable spatial and temporal resolution to better understand the nature of turbulent processes in tokamaks. We have found that the broadband magnetic fluctuations in the plasma core are nearly independent of the safety factor q(a). However, their level is dramatically reduced (by a factor of three) when the aspect ratio increases from 5.4 to 6.6. The character of electrostatic structures in the edge plasma was found to be quite similar to that observed in large tokamak experiments. Furthermore, the fluctuations of the longitudinal current have been identified in the scrape-off layer. These fluctuations might represent a link between the magnetic and electrostatic components of plasma turbulence in this region.

日本語訳

磁気および静電揺動は、トカマクにおける乱流過程の性質をより深く理解するために、CASTORトカマクにおいて合理的な空間的・時間的分解能で測定される。プラズマコアにおける広帯域磁気揺動は、安全係数q(a)にほぼ依存しないことが見出された。しかしながら、そのレベルは、アスペクト比が5.4から6.6に増加すると、劇的に(3分の1に)減少する。周辺プラズマにおける静電構造の特性は、大型トカマク実験で観測されたものと極めて類似していることが見出された。さらに、スクレイプオフ層において、縦方向電流の揺動が同定された。これらの揺動は、この領域におけるプラズマ乱流の磁気成分と静電成分の間の関連を表す可能性がある。

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