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Electron density evolution after L–H transitions and the L–H/H–L cycle in ASDEX Upgrade

M. Willensdorfer, E. Wolfrum, A. Scarabosio, F. Aumayr, R. Fischer, B. Kurzan, R.M. McDermott, A. Mlynek, B. Nold, S.K. Rathgeber2012年被引用 14Nuclear FusionIF 3出版社

The development of the electron density profile and its dependences after the L–H transition have been investigated. Only electron cyclotron resonance heated H-modes have been analysed to exclude core particle fuelling. While the density gradient in the edge transport barrier increases significantly after the L–H transition, the pedestal top temperature rises continuously with the applied heating power and shows no pronounced change at the transition. The H-mode density saturates at a level which correlates with the neutral gas density in the divertor prior to the L–H transition. Although the density build-up varies with the available deuterium inventory, the initial increase in the edge density gradient is similar. This has been observed independent of the L-mode plasma collisionality (ν* ≈ 2.8–5.5). The analysis of electron density and temperature profiles reveals that L–H and H–L transitions occur at similar pedestal top pressures, but the pedestal top densities are always higher at the time of the H–L back transition.

日本語訳

L-H遷移後の電子密度分布とその依存性の時間発展を調査した。コア部の粒子供給を排除するため、電子サイクロトロン共鳴加熱によるHモードのみを解析した。L-H遷移後にエッジ輸送障壁内の密度勾配は有意に増加する一方、ペデスタル頂部の温度は印加加熱パワーとともに連続的に上昇し、遷移時には顕著な変化を示さない。Hモード密度は、L-H遷移前のダイバータにおける中性ガス密度と相関するレベルで飽和する。密度の蓄積は利用可能な重水素インベントリに応じて変化するが、エッジ密度勾配の初期増加は同様である。これはLモードプラズマの衝突度(ν* ≈ 2.8–5.5)に依存せず観測された。電子密度および温度分布の解析により、L-H遷移とH-L遷移は同様のペデスタル頂部圧力で発生するが、ペデスタル頂部密度はH-L逆遷移時において常に高いことが明らかになった。

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