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Role of electrostatic perturbation on kinetic resistive wall mode with application to spherical tokamak

Yueqiang Liu, D.L. Keeling, A. Kirk, L. Kogan, J.W. Berkery, X.D. Du2024年6月Nuclear FusionIF 3出版社

A more complete non-perturbative magnetohydrodynamic (MHD)-kinetic hybrid formulation is developed by including the perturbed electrostatic potential δφ in the particle Lagrangian. The fluid-like counter-parts of the hybrid equations, in the Chew-Goldberger-Low high-frequency limit, are also derived and utilized to test the new toroidal implementation in the MARS-K code. Application of the updated non-perturbative hybrid model for a high-β spherical tokamak plasma in MAST finds that the perturbed electrostatic potential generally plays a minor role in the n = 1 (n is the toroidal mode number) resistive wall mode instability. The effect of δφ is largely destabilizing, with the growth rate of the instability increased by several (up to 20) percent as compared to the case without including δφ. A similar relative change is also obtained for the kinetic-induced resonant field amplification effect at high-β in the MAST plasma considered. The updated capability of the MARS-K code allows quantitative exploration of drift kinetic effects on various MHD instabilities and the antenna-driven plasma response where the electrostatic perturbation, coupled to magnetic perturbations, may play important roles.

日本語訳

摂動静電ポテンシャルδφを粒子ラグランジアンに含めることにより、より完全な非摂動的磁気流体力学(MHD)-運動論的ハイブリッド定式化を開発する。Chew-Goldberger-Low高周波極限におけるハイブリッド方程式の流体様対応物も導出し、MARS-Kコードにおける新しいトロイダル実装の検証に利用する。更新された非摂動的ハイブリッドモデルをMASTの高β球形トカマクプラズマに適用したところ、摂動静電ポテンシャルはn=1(nはトロイダルモード数)抵抗性壁モード不安定性において一般に副次的な役割しか果たさないことが分かった。δφの効果は主に不安定化であり、不安定性の成長率はδφを含まない場合と比較して数パーセント(最大20パーセント)増加する。同様の相対変化は、考慮したMASTプラズマの高βにおける運動論的誘起共鳴磁場増幅効果についても得られる。MARS-Kコードの更新された機能により、静電摂動が磁気摂動と結合して重要の役割を果たし得る種々のMHD不安定性およびアンテナ駆動プラズマ応答に対するドリフト運動論効果の定量的探査が可能になる。

装置

mast中精度(概要文一致)

wiki

Spherical tokamakResistive wall mode

AIによる論文要約

電磁的擾乱がキネティック抵抗性壁モードに及ぼす役割 - 球状トカマクへの応用
JAこの論文は、MHD不安定性やプラズマ応答におけるキネティック効果を理解したい核融合研究者に有用です。特に球状トカマクのような高βプラズマの解析に役立つでしょう。#MHD_Kinetic_Hybrid #Resistive_Wall_Mode #Spherical_Tokamak #Electrostatic_Perturbation

この論文では、粒子の運動方程式にペルターブド電位を含む新しい非摂動的MHD-キネティックハイブリッド方程式を開発しました。MAST高βプラズマの解析では、電位擾乱は抵抗性壁モードの不安定性を数%程度増大させることがわかりました。この新しい手法により、MHD不安定性やアンテナ駆動応答におけるキネティック効果を定量的に評価できるようになりました。

ENThis paper would be of interest to fusion researchers studying MHD instabilities, particularly those working on spherical tokamaks or exploring the role of electrostatic perturbations in plasma dynamics. Students interested in advanced plasma physics and computational modeling would also benefit from reading this work.#FusionResearch #MHDInstabilities #SphericalTokamak #ElectrostaticPerturbations #PlasmaModeling

This paper develops a new model to study the effect of electrostatic perturbations on the resistive wall mode instability in high-beta spherical tokamak plasmas. The results show that the electrostatic potential generally has a minor but destabilizing effect, increasing the growth rate of the instability by up to 20%. This updated capability allows for better exploration of drift kinetic effects on various MHD instabilities and plasma responses.

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