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Current sheets during spontaneous reconnection in a current-carrying fusion plasma

M Zuin, N Vianello, M Spolaore, V Antoni, T Bolzonella, R Cavazzana, E Martines, G Serianni, D Terranova2009年Plasma Physics and Controlled FusionIF 2.2出版社

An analysis of plasma dynamics during impulsive magnetic reconnection events in the RFX-mod reversed field pinch (RFP) is performed by means of a large set of magnetic in-vessel coils and of an insertable edge probe, equipped with a matrix of electrostatic (Langmuir) and magnetic probes. It is observed that reconnection of field lines, which leads to a global reconfiguration of the magnetic topology (relaxation), is associated with the rapid formation of a strongly localized magnetic perturbation characterized by a main m = 0 periodicity, due to enhanced dynamo modes activity. Soon after its formation, the m = 0 perturbation is observed to move in the toroidal direction and is shown to correspond to a poloidal current sheet, whose existence was predicted by three-dimensional MHD numerical simulations on RFP sustainment through magnetic reconnection processes. A reconstruction of the current density structure associated with the rotating magnetic perturbation is performed by means of the insertable probe, along with an investigation of the large induced modification of electron temperature, density and plasma velocity shear at the edge.

日本語訳

RFX-mod反転磁場ピンチ(RFP)におけるインパルス性磁気リコネクション事象中のプラズマ力学の解析を、多数の真空容器内磁気コイルと、静電(ラングミュア)プローブおよび磁気プローブのマトリクスを備えた挿入可能なプローブを用いて実施した。磁力線のリコネクションが、磁気トポロジーの大域的再構成(緩和)をもたらすが、これに伴い、ダイナモモード活動の増強により特徴づけられる強い局在磁気擾乱が急速に形成されることが観測された。このm=0擾乱は、形成直後にトロイダル方向へ移動することが観測され、これは、磁気リコネクション過程を通じたRFP維持に関する三次元MHD数値シミュレーションによって予測されていたポロイダル電流シートに対応することが示された。回転する磁気擾乱に伴う電流密度構造の再構成を、挿入可能なプローブを用いて実施するとともに、端部における電子温度、プラズマ密度、および速度シアの大きな誘起変動についても調査した。

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Magnetic reconnection
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