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Non-resonant magnetic braking on JET and TEXTOR

Y. Sun, Y. Liang, K.C. Shaing, Y.Q. Liu, H.R. Koslowski, S. Jachmich, B. Alper, A. Alfier, O. Asunta, P. Buratti2012年被引用 42Nuclear FusionIF 3出版社

The non-resonant magnetic braking effect induced by a non-axisymmetric magnetic perturbation is investigated on JET and TEXTOR. The collisionality dependence of the torque induced by the n = 1, where n is the toroidal mode number, magnetic perturbation generated by the error field correction coils on JET is observed. The observed torque is located mainly in the plasma core (normalized radius ρ < 0.4) and increases with decreasing collisionality. The neoclassical toroidal plasma viscosity (NTV) torque in the collisionless regime is modelled using the numerical solution of the bounce-averaged drift kinetic equation. The calculated collisionality dependence of the NTV torque is in good agreement with the experimental observation on JET. The reason for this collisionality dependence is that the torque in the plasma core on JET mainly comes from the flux of the trapped electrons, which are still mainly in the 1/ν regime. The strongest NTV torque on JET is also located near the plasma core. The magnitude of the NTV torque strongly depends on the plasma response, which is also discussed in this paper. There is no obvious braking effect with n = 2 magnetic perturbation generated by the dynamic ergodic divertor on TEXTOR, which is consistent with the NTV modelling.

日本語訳

非軸対称磁場摂動によって誘起される非共鳴磁気制動効果が、JETおよびTEXTORにおいて調査された。誤差場補正コイルによって生成されるn = 1(ここでnはトロイダルモード数)磁場摂動によって誘起されるトルクの衝突頻度依存性が、JETにおいて観測された。観測されたトルクは主にプラズマコア(規格化半径ρ < 0.4)に位置し、衝突頻度の減少とともに増大する。無衝突領域における新古典トロイダルプラズマ粘性(NTV)トルクは、バウンス平均化されたドリフト運動論方程式を用いてモデル化された。計算されたNTVトルクの衝突頻度依存性は、JETにおける実験観測と良好な一致を示す。この衝突頻度依存性の理由は、JETのプラズマコアにおけるトルクが主に捕捉電子のフラックスに由来し、それらの電子が依然として主に1/ν領域にあるためである。JETにおける最も強いNTVトルクもまた、プラズマコア近傍に位置する。NTVトルクの大きさはプラズマ応答に強く依存しており、これについても本論文で議論される。TEXTORにおける動的エルゴディックダイバータによって生成されるn = 2磁場摂動では、明確な制動効果は観測されず、これはNTVモデリングと一致する。

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jet高精度(タイトル一致)textor高精度(タイトル一致)

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JETTEXTOR
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