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Effect of electron cyclotron resonance heating (ECRH) on toroidal rotation in ASDEX Upgrade H-mode discharges

R M McDermott, C Angioni, R Dux, A Gude, T Pütterich, F Ryter, G Tardini, the ASDEX Upgrade Team2011年Plasma Physics and Controlled FusionIF 2.2出版社

Core toroidal rotation behavior and momentum transport have been examined in neutral beam injection (NBI) heated plasmas with and without electron cyclotron resonance heating (ECRH) in ASDEX Upgrade (AUG). The impurity ion temperature and rotation are measured by means of charge exchange recombination spectroscopy (CXRS) and the main ion rotation is calculated neoclassically based on the measured impurity ion temperature and rotation profiles. In purely NBI heated discharges the plasma spins up in the co-current direction and forms peaked rotation profiles. However, when ECRH power is added to these discharges the rotation decreases significantly leading to flat and occasionally slightly hollow profiles. The rotation at the edge of the plasma (ρ > 0.65) is largely unaffected by the application of the ECRH. During ECRH phases the electron temperature in the core increases dramatically concomitant with a flattening of the ion temperature profile. In these phases peaking of the impurity ion and electron density profiles is also observed. The change in toroidal rotation is sensitive to both the amount of ECRH power deposited as well as to the deposition location. The measured rotation changes cannot be explained by a modification to the NBI torque deposition profile, a preferential loss of fast ions from the plasma core, or by a simple increase in momentum diffusivity. In addition, the inward directed Coriolis momentum pinch is predicted to increase, not decrease, during the ECRH phases. Altogether, the data suggest the presence of either an outward convection of momentum or an intrinsic, counter-current directed torque. Although the physics behind these possibilities remains unclear, they are presumably related to either a convective or residual stress driven momentum flux, which responds to the ECRH-induced changes in the plasma profiles and turbulence.

日本語訳

コアのトロイダル回転挙動と運動量輸送が、ASDEX Upgrade(AUG)において、電子サイクロトロン共鳴加熱(ECRH)の有無にかかわらず、中性粒子ビーム入射(NBI)加熱プラズマで調べられた。不純物イオン温度と回転は、荷電交換再結合分光法(CXRS)によって測定され、主イオン回転は、測定された不純物イオン温度と回転分布に基づいて新古典的に計算された。純粋なNBI加熱放電では、プラズマは電流方向にスピンアップし、ピーク状の回転分布が形成される。しかし、これらの放電にECRHパワーを加えると、回転は有意に減少し、平坦な、時にはわずかに中空の分布になる。プラズマ端部(ρ > 0.65)での回転は、ECRHの印加によってほとんど影響を受けない。ECRH位相中、コアの電子温度は劇的に上昇し、それに伴ってイオン温度分布の平坦化が生じる。これらの位相では、不純物イオンと電子密度分布のピーキングも観測される。トロイダル回転の変化は、堆積されるECRHパワーの量と堆積位置の両方に敏感である。測定された回転変化は、NBIトルク堆積分布の変更、プラズマコアからの高速イオンの選択的損失、または運動量拡散係数の単純な増加によっては説明できない。さらに、内向きのコリオリ運動量ピンチは、ECRH位相中に増加すると予測されており、減少ではない。全体として、これらのデータは、外向きの運動量対流または反電流方向の固有トルクの存在を示唆している。これらの可能性の背後にある物理は不明のままであるが、それらはおそらく、ECRHによって誘起されたプラズマ分布と乱流の変化に応答する、対流的または残留応力駆動の運動量フラックスのいずれかに関連している。

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asdex-upgrade高精度(タイトル一致)

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ASDEXASDEX UpgradeH-modeElectron cyclotron heatingCyclotron resonanceElectron cyclotron resonanceToroidal rotation
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