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Improved localisation of neoclassical tearing modes by combining multiple diagnostic estimates

C.J. Rapson, R. Fischer, L. Giannone, M. Maraschek, M. Reich, W. Treutterer, The ASDEX Upgrade Team2017年被引用 3Nuclear FusionIF 3出版社

Neoclassical tearing modes (NTMs) strongly degrade confinement in tokamaks, and are a leading cause of disruptions. They can be stabilised by targeted electron cyclotron current drive (ECCD), however the effectiveness of ECCD depends strongly on the accuracy or misalignment between ECCD and the NTM. The first step to ensure minimal misalignment is a good estimate of the NTM location. In previous NTM control experiments, three methods have been used independently to estimate the NTM location: the magnetic equilibrium, correlation between magnetic and spatially-resolved temperature fluctuations, and the amplitude response of the NTM to nearby ECCD. This submission describes an algorithm which has been designed to fuse these three estimates into one, taking into account many of the characteristics of each diagnostic. Although the method diverges from standard data fusion methods, results from simulation and experiment confirm that the algorithm achieves its stated goal of providing an estimate that is more reliable and accurate than any of the individual estimates.

日本語訳

新古典テアリングモード(NTM)はトカマクにおける閉じ込めを強く劣化させ、ディスラプションの主要な原因の一つである。これらは、ターゲットを絞った電子サイクロトロン電流駆動(ECCD)によって安定化できるが、ECCDの有効性はECCDとNTMの間の精度または位置ずれに強く依存する。最小限の位置ずれを確保するための第一歩は、NTMの位置を良好に推定することである。これまでのNTM制御実験では、磁気平衡、磁気揺動と空間分解された温度揺動の間の相関、および近傍のECCDに対するNTMの振幅応答という3つの方法が、NTMの位置を独立に推定するために用いられてきた。本稿では、各診断法の多くの特性を考慮に入れつつ、これら3つの推定値を1つに融合するように設計されたアルゴリズムについて述べる。この手法は標準的なデータ融合手法とは異なるが、シミュレーションと実験の結果から、このアルゴリズムが、個々の推定値のいずれよりも信頼性が高く正確な推定値を提供するという目標を達成することが確認された。

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Plasma diagnosticsTearing modeNeoclassical tearing mode
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