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A linear equation based on signal increments to predict disruptive behaviours and the time to disruption on JET

J. Vega, A. Murari, S. Dormido-Canto, F. Hernández, T. Cruz, D. Gadariya, G.A. Rattá, JET Contributors2020年被引用 13Nuclear FusionIF 3出版社

This article describes the development of a generic disruption predictor that is also used as basic system to provide an estimation of the time to disruption at the alarm times. The mode lock signal normalised to the plasma current is used as input feature. The recognition of disruptive/non-disruptive behaviours is not based on a simple threshold of this quantity but on the evolution of the amplitudes between consecutive samples taken periodically. The separation frontier between plasma behaviours (disruptive/non-disruptive) is linear in such parameter space. The percentages of recognised and false alarms are 98% and 4%, respectively. The recognised alarms can be split into valid alarms (90%) and late detections (8%). The experimental distribution of warning times follows an exponential model with average warning time of 443 ms. On the other hand, the prediction of the time to the disruption has been fitted to a Weibull model that relates this predicted time to the distance of the points to the diagonal in the parameter space of consecutive samples. The model shows a very good agreement between predicted times and warning times in narrow time intervals (between 0.01 s and 0.06 s) before the disruption.

日本語訳

本稿では、汎用ディスラプション予測器の開発について述べる。この予測器は、警報時におけるディスラプションまでの時間の推定を提供する基本システムとしても使用される。プラズマ電流で正規化されたモードロック信号が入力特徴量として使用される。ディスラプション性/非ディスラプション性挙動の認識は、この量の単純な閾値に基づくものではなく、定期的に取得される連続サンプル間の振幅の変化に基づく。プラズマ挙動(ディスラプション性/非ディスラプション性)間の分離境界は、このようなパラメータ空間において線形である。認識率および誤警報率はそれぞれ98%および4%である。認識された警報は、有効警報(90%)と遅延検出(8%)に分類できる。警報時間の実験的分布は指数モデルに従い、平均警報時間は443 msである。一方、ディスラプションまでの時間の予測は、連続サンプルのパラメータ空間における点の対角線からの距離にこの予測時間を関連付けるワイブルモデルに適合されている。このモデルは、ディスラプション前の狭い時間間隔(0.01 sから0.06 sの間)において、予測時間と警報時間の間に非常に良好な一致を示す。

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