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Interplay between edge magnetic topology, pressure profile and blobs in the edge of RFX-mod

M Agostini, A Scaggion, P Scarin, G Spizzo, N Vianello2012年Plasma Physics and Controlled FusionIF 2.2出版社

The observation of the periodic pressure profile time oscillations in the edge region (0.93 < r/a < 1) of a RFX-mod device allows one to investigate the role of pressure as a turbulence regulation mechanism. The proportionality between the radial correlation length of edge fluctuations and the radial characteristic pressure length Lp suggests a sort of regulation of the turbulent spatial scale, where Lp sets the radial dimension of the blobs. Moreover, the spatial scale regulation is confirmed by observing a linear scaling between the energy injection scale and the toroidal dimension of the edge coherent structures. On the other hand, the link between ∇Pe and turbulence level does not hold locally: the edge fluctuation level is higher in the toroidal region of lower edge pressure gradient. Hence if coherent structures are generated locally in the region of strongest ∇Pe, they flow and accumulate where ∇Pe is lower.

日本語訳

RFX-mod装置のエッジ領域(0.93 < r/a < 1)における周期的圧力プロファイル時間振動の観測により、乱流抑制機構としての圧力の役割を調査することが可能となる。エッジ変動の径方向相関長と特性圧力径方向スケール長Lpとの間の比例関係は、乱流空間スケールの一種の抑制を示唆しており、ここでLpがブロブの径方向寸法を決定づける。さらに、エネルギー注入スケールとエッジコヒーレント構造のトロイダル方向寸法との間の線形スケーリングが観測されることにより、空間スケールの抑制が確認される。一方で、∇Peと乱流レベルとの関連は局所的には成立しない:エッジ変動レベルは、より低いエッジ圧力勾配を有するトロイダル領域においてより高い。したがって、もしコヒーレント構造が最も強い∇Peの領域で局所的に生成されるならば、それらは∇Peがより低い領域へと流れ、そこに蓄積することになる。

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