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Numerical MHD stability studies: toroidal rotation, viscosity, resistive walls and current holes

E. Strumberger, S. Günter, P. Merkel, S. Riondato, E. Schwarz, C. Tichmann, H.P. Zehrfeld2005年被引用 37Nuclear FusionIF 3出版社

The linear magnetohydrodynamic (MHD) stability of ideal and resistive, axisymmetric toroidal equilibria is investigated with respect to various physical effects, such as differential toroidal rotation, viscosity, ideal and resistive external walls and current holes. For this purpose, the CASTOR code has been comprehensively extended. Static equilibria, equilibria with toroidal flow and equilibria with current holes serve as input to this code called CASTOR_FLOW code. ASDEX Upgrade type equilibria with toroidal flow are computed up to a toroidal Mach number of Mta = 0.5, and compared with the static solution. Using these equilibria, the stabilizing effect of differential toroidal rotation on double tearing modes (DTMs) is investigated. The studies show that the computation of equilibria with flow is necessary for toroidally rotating plasma with Mta ⩾ 0.2. The stability of DTMs is also studied for equilibria with current holes. Further, the stabilizing effect of a resistive wall on an external ideal kink mode is investigated.

日本語訳

線形磁気流体力学(MHD)安定性を、理想および抵抗性の軸対称トロイダル平衡について、差動トロイダル回転、粘性、理想および抵抗性の外部壁、電流ホールなどの様々な物理効果に関して調査する。この目的のため、CASTORコードを包括的に拡張した。静的平衡、トロイダル流を伴う平衡、および電流ホールを伴う平衡が、CASTOR_FLOWコードと呼ばれるこのコードへの入力として用いられる。トロイダル流を伴うASDEX Upgrade型平衡を、トロイダルマッハ数Mta = 0.5まで計算し、静的解と比較する。これらの平衡を用いて、差動トロイダル回転が二重テアリングモード(DTM)に及ぼす安定化効果を調査する。研究により、Mta ⩾ 0.2のトロイダル回転プラズマに対しては、流れを伴う平衡の計算が必要であることが示される。DTMの安定性は、電流ホールを伴う平衡についても研究される。さらに、外部理想キンクモードに対する抵抗性壁の安定化効果も調査される。

装置

asdex-upgrade低精度(概要文一致)

wiki

MagnetohydrodynamicsToroidal rotationMHD stability
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