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High frequency edge coherent modes studied with the ultra-fast swept reflectometer on ASDEX Upgrade

A Medvedeva, C Bottereau, F Clairet, G D Conway, P Manz, F Mink, V Nikolaeva, D Prisiazhniuk, U Stroth, E Wolfrum2019年Plasma Physics and Controlled FusionIF 2.2出版社

The results on high frequency coherent modes developing at the plasma edge after L–H transitions are presented. These edge coherent modes (ECMs) observed in the I-phase, during ELM-free and ELMy H-mode phases have common characteristics, such as their frequency of 50–200 kHz, radial position and scaling of the frequency with the pressure gradient. The ultra-fast swept reflectometer with the sweep time of 1 μs has provided measurements of the mode dynamics and localisation. The ECMs propagate in the electron diamagnetic direction in the laboratory frame and are localized in the region between the pedestal top and the steepest pressure gradient.

日本語訳

L-H遷移後にプラズマ端部で発生する高周波コヒーレントモードに関する結果を提示する。I相、ELMフリーおよびELMy H相で観測されたこれらのエッジコヒーレントモード(ECM)は、50〜200 kHzの周波数、径方向位置、圧力勾配に伴う周波数のスケーリングなど、共通の特性を有する。掃引時間1 μsの超高速反射計により、モードの動態と局在性の測定が行われた。ECMは実験室系において電子反磁性方向に伝播し、ペデスタル頂部と最も急峻な圧力勾配領域の間に局在する。

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asdex-upgrade高精度(タイトル一致)

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