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Magnetic perturbations as a viable tool for edge turbulence modification

N Vianello, C Rea, M Agostini, R Cavazzana, G Ciaccio, G De Masi, E Martines, A Mazzi, B Momo, G Spizzo2015年Plasma Physics and Controlled FusionIF 2.2出版社

A complete description of the effects of magnetic perturbation on the edge region of RFX-mod is here reported. The flexibility of the RFX-mod device [1] allows for the operation of the machine both as a reversed field pinch (RFP, with maximum current 2 MA) and as a low-current, circular ohmic tokamak (Ip,max = 0.15 MA). The present paper summarizes the most recent results obtained in both configurations with either spontaneous or induced edge radial magnetic perturbation. Emphasis will be devoted to the experimental characterization of the edge flow, focusing on the phase relation between flow and perturbed magnetic field. These informations are provided for natural and stimulated helical discharges in RFPs, and for tokamak safely operated, thanks to the unique RFX-mod MHD control system, in a wide range of edge safety factor 1.9 ≲ q(a) ⩽ 3.4 with externally imposed helical boundary. For the first time a detailed comparison between this phenomenology in tokamaks and RFPs will be presented, providing experimental measurement of the streamline of E × B flow around the magnetic perturbation and of the density modulation which exhibits the same periodicity of the perturbation. Strong new indication of the modification of the small scale turbulence in presence of magnetic perturbation is reported: this modification is deeply connected to the variation of turbulence induced particle transport.

日本語訳

RFX-modのエッジ領域における磁気摂動の影響の完全な記述をここに報告する。RFX-mod装置[1]の柔軟性により、この装置を反転磁場ピンチ(RFP、最大電流2 MA)としても、低電流の円形オーミック・トカマク(Ip,max = 0.15 MA)としても運転することが可能である。本論文は、自発的または誘起されたエッジ半径方向磁気摂動を伴う両構成において得られた最新の結果を要約するものである。エッジ流の実験的特徴付けに重点を置き、流れと摂動磁場の間の位相関係に焦点を当てる。これらの情報は、自然および刺激されたヘリカル放電におけるRFP、ならびに安全に運転されるトカマクについて提供され、これは独自のRFX-mod MHD制御システムによるものであり、外部から課されたヘリカル境界を有する広範囲のエッジ安全係数1.9 ≲ q(a) ≲ 3.4にわたる。トカマクとRFPにおけるこの現象論の間の詳細な比較が初めて提示され、磁気摂動周辺のE × B流の流線と、摂動と同じ周期性を示す密度変調の実験的測定が提供される。磁気摂動の存在下での小規模乱流の変調の新たな強力な指標が報告される:この変調は、乱流誘起粒子輸送の変化に深く関連している。

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Magnetic perturbationEdge turbulence
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