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Comparing TCV experimental VDE responses with DINA code simulations

J-Y Favez, R R Khayrutdinov, J B Lister, V E Lukash2002年Plasma Physics and Controlled FusionIF 2.2出版社

The DINA free-boundary equilibrium simulation codehas been implemented for TCV, including the full TCV feedback anddiagnostic systems. First results showed good agreement with control coilperturbations and correctly reproduced certain non-linear features in theexperimental measurements. The latest DINA codesimulations, presented in this paper, exploit discharges with differentcross-sectional shapes and different vertical instability growth rateswhich were subjected to controlled vertical displacement events (VDEs),extending previous work with the DINA code on the DIII-Dtokamak. The height of the TCV vessel allows observationof the non-linear evolution of the VDE growth rate as regions of differentvertical field decay index are crossed. The verticalmovement of the plasma is found to be well modelled. For most experiments,DINA reproduces the S-shape of the vertical displacement in TCV withexcellent precision. This behaviour cannot be modelled using lineartime-independent models because of the predominant exponential shape dueto the unstable pole of any linear time-independent model. The other mostcommon equilibrium parameters like the plasma current Ip, theelongation κ, the triangularity δ, the safety factor q,the ratio between the averaged plasma kinetic pressure and the pressure ofthe poloidal magnetic field at the edge of the plasma βp, and theinternal self inductance li also show acceptable agreement. Theevolution of the growth rate γ is estimated and compared with theevolution of the closed-loop growth rate calculated with the RZIP linearmodel, confirming the origin of the observed behaviour.

日本語訳

DINA自由境界平衡シミュレーションコードは、完全なフィードバックシステムと診断システムを含めて、TCV用に実装されている。最初の結果は、制御コイル摂動と良好な一致を示し、実験測定における特定の非線形特徴を正しく再現した。本論文で提示される最新のDINAシミュレーションは、異なる断面形状と異なる垂直不安定性成長率を持つ放電を利用し、DIII-DトカマクにおけるDINAコードを用いた以前の研究を拡張して、制御された垂直変位事象(VDE)に供した。TCV容器の高さにより、異なる垂直磁場減衰指数領域を横切る際のVDE成長率の非線形発展の観測が可能となる。プラズマの垂直移動は良好にモデル化されていることが分かった。ほとんどの実験において、DINAはTCVにおける垂直変位のS字形状を優れた精度で再現する。この挙動は、任意の線形時間不変モデルの不安定極に起因する支配的な指数形状のため、線形時間不変モデルではモデル化できない。プラズマ電流Ip、伸長度κ、三角形度δ、安全係数q、プラズマ端部における平均プラズマ運動圧力とポロイダル磁場圧力の比βp、内部インダクタンスなどの他の最も一般的な平衡パラメータも、許容可能な一致を示す。成長率γの時間発展は推定され、RZIP線形モデルで計算された閉ループ成長率の時間発展と比較され、観測された挙動の起源が確認された。

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