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Requirements for alignment of electron cyclotron current drive for neoclassical tearing mode stabilization in ITER

R.J. La Haye, J.R. Ferron, D.A. Humphreys, T.C. Luce, C.C. Petty, R. Prater, E.J. Strait, A.S. Welander2008年被引用 46Nuclear FusionIF 3出版社

ITER will rely on electron cyclotron stabilization of neoclassical tearing mode islands. The large size and low torque applied in ITER imply slow plasma rotation and susceptibility to island locking by the resistive wall; locking is likely to lead to a loss of the high confinement H-mode, a beta collapse and possibly disruption. 'Front' steering of the launcher, with narrower electron cyclotron current drive (ECCD), has resolved the issue in 'remote' steering of the driven current being too broad and relatively ineffective. However, narrower current drive places demands on alignment of the current drive on the rational surface that is being stabilized. DIII-D alignment techniques with and without (preemptive) an island are reviewed. The results are used to check models for the effect of misalignment and are then applied to ITER. Criteria for accuracy of alignment as a function of injected power and for the necessary time response of the controller are presented.

日本語訳

ITERは、新古典ティアリングモード島の電子サイクロトロン安定化に依存するであろう。ITERの大きなサイズと低い印加トルクは、遅いプラズマ回転と、抵抗性壁による島のロッキングに対する感受性を意味する;ロッキングは、高閉じ込めHモードの喪失、ベータ崩壊、そしておそらくディスラプションにつながる可能性が高い。ランチャーの「フロント」ステアリングは、より狭い電子サイクロトロン電流駆動(ECCD)により、「リモート」ステアリングにおける駆動電流が広すぎて比較的効果がないという問題を解決した。しかしながら、より狭い電流駆動は、安定化されている有理面への電流駆動の位置合わせに要求を課す。島がある場合とない場合(予防的)のDIII-Dの位置合わせ技術がレビューされる。その結果は、位置ずれの効果に関するモデルを検証するために使用され、その後ITERに適用される。注入パワーの関数としての位置合わせ精度の基準と、制御器の必要な時間応答の基準が提示される。

装置

iter高精度(タイトル一致)diii-d低精度(概要文一致)

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ITERCurrent driveTearing modeNeoclassical tearing modeElectron cyclotron current drive
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