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Edge turbulence characterization in RFX-mod with optical diagnostics

M Agostini, P Scarin, R Cavazzana, F Sattin, G Serianni, M Spolaore, N Vianello2009年Plasma Physics and Controlled FusionIF 2.2出版社

In the edge region of fusion devices coherent structures (blobs) are commonly observed. In order to investigate their evolution and the possible driving mechanisms, we studied the relationship between the size of the coherent structures and the local characteristic length Lp of the edge electron pressure profile Pe(r), together with the effect of magnetic fluctuations on ∇Pe. The results show an increase in the blob size with both Lp and magnetic fluctuations, suggesting an interplay between electron pressure gradient, magnetic fluctuations and edge turbulence generation.Measurements of the spatial scales of the edge turbulence structures and the corresponding toroidal phase velocity are obtained in the reversed field pinch RFX-mod by means of a gas puffing imaging diagnostic, while the local edge profiles of electron density ne(r) and temperature Te(r) and therefore Pe(r) have been measured via the line intensity ratio technique of helium emission lines.

日本語訳

核融合装置の周辺領域では、コヒーレント構造(ブロブ)が一般的に観測される。それらの発展と可能な駆動機構を調査するために、我々はブロブのサイズと周辺電子圧力分布Pe(r)の特性長Lpとの関係、および∇Peに対する磁気揺動の影響について研究した。その結果、ブロブサイズはLpと磁気揺動の両方とともに増加することが示され、電子圧力勾配、磁気揺動、および周辺乱流生成の間の相互作用が示唆された。逆転磁場ピンチRFX-modにおいて、ガス噴射イメージング診断法を用いて周辺乱流構造の空間スケールと対応するトロイダル位相速度の測定が行われ、一方、ヘリウム発光線の線強度比法を用いて周辺電子密度ne(r)と電子温度Te(r)、したがってPe(r)の局所分布が測定された。

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Plasma diagnosticsRFXEdge turbulence
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