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State-of-the-art neoclassical tearing mode control in DIII-D using real-time steerable electron cyclotron current drive launchers

E. Kolemen, A.S. Welander, R.J. La Haye, N.W. Eidietis, D.A. Humphreys, J. Lohr, V. Noraky, B.G. Penaflor, R. Prater, F. Turco2014年被引用 42Nuclear FusionIF 3出版社

Real-time steerable electron cyclotron current drive (ECCD) has been demonstrated to reduce the power requirements and time needed to remove 3/2 and 2/1 neoclassical tearing modes (NTMs) in the DIII-D tokamak. In a world first demonstration of the techniques required in ITER, the island formation onset is detected automatically, gyrotrons are turned on and the real-time steerable ECCD launcher mirrors are moved promptly to drive current at the location of the islands. This shrinks and suppresses the modes well before saturation using real-time motional Stark effect constrained equilibria reconstruction with advanced feedback and search algorithms to target the deposition. In ITER, this method will reduce the ECCD energy requirement and so raise Q by keeping the EC system off when the NTM is not present. Further, in the experiments with accurate tracking of pre-emptive ECCD to resonant surfaces, both 3/2 and 2/1 modes are prevented from appearing with much lower ECCD peak power than required for removal of a saturated mode.

日本語訳

リアルタイムステアリング可能な電子サイクロトロン電流駆動(ECCD)は、DIII-Dトカマクにおける3/2および2/1新古典テアリングモード(NTM)の除去に必要な電力と時間を低減できることが実証された。ITERに必要な技術の世界初の実証として、島の形成が自動的に検出され、ジャイロトロンが作動し、リアルタイムステアリング可能なECCDランチャーミラーが駆動されて、島の位置に電流を即座に供給した。これにより、高度なフィードバックアルゴリズムとモーションラル効果(MSE)拘束平衡再構成を用いて、モードが飽和する前に抑制・消滅された。ITERでは、この手法により、NTMが存在しない場合にECシステムをオフにすることで、ECCDエネルギー要件が低減され、Qが向上する。さらに、実験では、正確な追跡による予防的ECCDを共鳴面に適用することで、3/2および2/1モードの両方が、飽和モードの除去に必要なピーク電力よりもはるかに低いECCDピーク電力で発生を防止できることが示された。

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diii-d高精度(タイトル一致)iter低精度(概要文一致)

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DIII-DCurrent driveTearing modeNeoclassical tearing modeElectron cyclotron current drive
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