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Investigation of plasma edge turbulence using a gas-puff imaging system in the reversed-field pinch device TPE-RX

R Cavazzana, G Serianni, P Scarin, M Agostini, N Vianello, Y Yagi, H Koguchi, S Kiyama, H Sakakita, Y Hirano2007年Plasma Physics and Controlled FusionIF 2.2出版社

An investigation of the edge region in a large reversed-field pinch (RFP) device has been undertaken for the first time using a high time resolution gas-puff imaging (GPI) system, applied to the TPE-RX experiment. The GPI diagnostic is aimed at the investigation of turbulence in the edge region under the severe heat flux conditions of thermonuclear fusion-grade plasmas, where conventional electrostatic probes cannot be used. To compare the data obtained by the GPI during low power experiments, a retractable array of electrostatic probes has been added. The whole diagnostic system provided high quality measurements of fluctuations with fine spatial and temporal resolution, as well as radial profiles of relevant plasma parameters. The measurements confirm several important properties of plasma edge already found in other experiments, like the presence of a strong ExB shear layer and the 'intermittent' behaviour of the measured quantities, which display non-Gaussian fluctuation spikes at different time scales. Along with the conventional power spectra and correlation analyses, the application of continuous wavelet transform techniques to GPI data allowed a detailed description of the spatial structure and of the propagation of these localized 'intermittent events'.

日本語訳

大型逆転磁場ピンチ(RFP)装置における周辺領域の調査が、TPE-RX実験に適用された高時間分解能ガスパフイメージング(GPI)システムを用いて初めて実施された。GPI診断法は、従来の静電プローブを使用できない核融合グレードのプラズマにおける厳しい熱流束条件下での周辺乱流の調査を目的としている。低出力実験中にGPIから得られたデータと比較するため、引き込み式の静電プローブアレイが追加された。この統合診断システムにより、微細な空間・時間分解能を備えた高品質のゆらぎ測定と、関連するプラズマパラメータの動径分布計測が実現した。測定結果は、他の実験で既に見出されている周辺プラズマの重要な特性を裏付けるものであり、強いExBシア層の存在や、異なる時間スケールで非ガウス型のゆらぎスパイクを示す測定値の「間欠的」挙動が確認された。従来のパワースペクトル解析および相関解析に加え、GPIデータへの連続ウェーブレット変換手法の適用により、これらの局在化した「間欠的イベント」の空間構造と伝播特性の詳細な記述が可能となった。

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Reversed field pinchEdge turbulence
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