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Phenomenological comparison of magnetic and electrostatic fluctuations in the Macrotor tokamak

S.J. Zweben, R.J. Taylor1981年被引用 92Nuclear FusionIF 3出版社

Probe measurements of magnetic and electrostatic fluctuations in Macrotor are compared. Attention is concentrated on small-scale fluctuations which lie in the frequency range above the usual low-frequency Mirnov oscillations. In this range, 20 kHz < f > 125 kHz, the spectra of and are similar; the radial profile of ñ/n is, however, peaked toward the outside while that of r is peaked toward the centre, and no local cross-correlation between and has been detected. The radial correlation length of is smaller than that for r (both being much smaller than the minor radius), but the poloidal correlation lengths of p and are similar. Both and fluctuations rotate in the electron diamagnetic drift direction. The spectra are roughly invariant to an increase in density; however, the magnitude of ñ/n decreases with density while that of r remains unchanged. No connection between these fluctuations and anomalous transport has been established.

日本語訳

マクロトールにおける磁気および静電揺動のプローブ測定について考察する。通常の低周波ミルノフ振動を超える周波数領域に位置する小規模揺動に焦点を当てる。この周波数範囲(20 kHz < f < 125 kHz)において、 と のスペクトルは類似している。しかし、 の動径プロファイルは外側に向かってピークを持つ一方、 のそれは中心部でピークを示し、 と の間には局所的な相関は検出されていない。 の動径相関長は のそれよりも短い(両者とも小半径よりもはるかに小さい)が、 と のポロイダル相関長は同程度である。 と の両方の揺動は電子反磁性ドリフト方向に回転する。スペクトルは密度の増加に対してほぼ不変であるが、 の大きさは密度とともに減少する一方、 の大きさは変化しない。これらの揺動と異常輸送との間の関連は確立されていない。

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