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Characterization of edge turbulence in different states of divertor detachment using reflectometry in the ASDEX Upgrade tokamak

V Nikolaeva, L Guimarais, P Manz, D Carralero, M E Manso, U Stroth, C Silva, G D Conway, E Seliunin, J Vicente2018年Plasma Physics and Controlled FusionIF 2.2出版社

Transport in the scrape-off layer (SOL) depends on the state of divertor detachment. L-mode discharges were analyzed where the state of divertor detachment is varied through a density ramp-up. By means of reflectometry measurements at the low (LFS) and the high field side (HFS), midplane density fluctuations are studied for the first time in ASDEX Upgrade simultaneously at both sides of the tokamak. Radial density fluctuation profiles () increase with radius in both the HFS and the LFS. It is found that in the SOL density fluctuations at the LFS have about a factor of two larger amplitude than at the HFS in agreement with ballooned transport. Density fluctuations at the LFS show a modest variation with increasing background density resulting mainly from a rise of low frequency components. Experimental results are in good agreement with an enhanced convection of filaments at the LFS at the beginning of outer divertor detachment leading to a flatter SOL density profile. In this phase of the discharge, density fluctuations measured at the HFS far-SOL display a strong increase, which may be associated with the presence of faster filaments originated at the LFS.

日本語訳

スクレイプオフ層(SOL)における輸送は、ダイバータの非接触状態に依存する。密度ランプアップによってダイバータの非接触状態を変化させたLモード放電を解析した。低磁場側(LFS)および高磁場側(HFS)での反射計測定により、ASDEX Upgradeトカマクにおいて両側で同時に中間面の密度揺動を初めて研究した。動径方向の密度揺動プロファイル()は、HFSおよびLFSの両方で半径とともに増加する。SOLにおいて、LFSでの密度揺動はHFSよりも約2倍大きい振幅を有することが見出され、これはバルーニング輸送と一致する。LFSでの密度揺動は、背景密度の増加に伴って緩やかな変化を示し、これは主に低周波成分の上昇に起因する。実験結果は、外側ダイバータの非接触状態への移行開始時におけるLFSでのフィラメントの対流増強と良好に一致し、これによりSOL密度プロファイルが平坦化する。この放電フェーズにおいて、HFSの遠スクレイプオフ層での密度揺動は強い増加を示し、これはLFSで発生したより高速なフィラメントの存在に関連している可能性がある。

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asdex-upgrade高精度(タイトル一致)

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DivertorASDEXASDEX UpgradeReflectometryDivertor detachmentEdge turbulence
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