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A study of runaway electron confinement in the ASDEX tokamak

O.J. Kwon, P.H. Diamond, F. Wagner, G. Fussmann, ASDEX Team, NI Team1988年被引用 75Nuclear FusionIF 3出版社

The results of runaway electron confinement experiments from ASDEX are analysed to elucidate the structure of electromagnetic turbulence which may cause anomalous electron heat transport in the L-mode confinement regime. From a simple model, the radial correlation length (W) of the magnetic turbulence is determined to be about 1 mm. Using this value and that of the experimentally deduced electron thermal diffusivity, the authors determine the radial magnetic fluctuation level at the plasma edge in the L-mode to be (r/B0) ∼ 2 × 10−4. Scalings of W and r/B0 are deduced from parameter scans. From a comparison of these results with the predictions of various theoretical models, it is concluded that skin depth turbulence, electromagnetic drift wave turbulence, rippling modes, and microtearing modes are inferior candidates and that resistive ballooning modes offer the best possibility for a consistent interpretation of the data.

日本語訳

ASDEXからの逃走電子閉じ込め実験の結果を解析し、Lモード閉じ込め領域における異常電子熱輸送を引き起こす可能性のある電磁乱流の構造を解明する。単純なモデルから、磁気乱流の径方向相関長(W)は約1mmと決定される。この値と実験的に導出された電子熱拡散係数を用いて、プラズマ端部における径方向磁気擾乱レベル(r/B0)は約2×10⁻⁴と見積もられる。パラメータスキャンからWおよびr/B0のスケーリング則が導出される。これらの結果を各種理論モデルの予測と比較した結論として、表皮深さ乱流、電磁ドリフト波乱流、リップリングモード、マイクロティアリングモードは有力な候補ではなく、抵抗性バルーニングモードがデータの整合的な解釈に最も適していることが示された。

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