In this paper we show that the effect of the saddle currents in the rigid sectors slows down the vertical instability of JET elongated plasmas with respect to estimates based on pure axisymmetric models. This, together with an accurate description of the passive structures, significantly improves the agreement between the theoretical predictions and the experimental results. Linearized models taking into account the three-dimensional effects of the eddy currents have been applied to various JET pulses; the growth rates have been estimated within an accuracy of less than 5% for plasmas with a growth time longer than 2 ms. This model can be used for JET and extended to ITER-FEAT to provide a reliable test bed for assessing the performance of the vertical control system and obtain an estimate of the loads on the structures during vertical displacement events (VDEs) and plasma disruptions.
本論文では、サドル電流の効果が、純粋な軸対称モデルに基づく推定と比較して、JET細長プラズマの垂直不安定性を遅延させることを示す。これは、受動構造物の正確な記述と相まって、理論的予測と実験結果の間の一致を有意に改善する。渦電流の三次元効果を考慮した線形化モデルを様々なJETパルスに適用し、成長時間が2ミリ秒を超えるプラズマについて、成長率を5%未満の精度で推定した。このモデルはJETに適用可能であり、ITER-FEATにも拡張でき、垂直変位事象（VDE）およびプラズマディスラプション中の構造物への負荷を評価し、垂直制御システムの性能を検証するための信頼性の高いテストベッドを提供する。