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H-mode power threshold and confinement in a molybdenum wall with different magnetic configurations on the EAST tokamak

Z.X. Liu, X. Gao, S.C. Liu, S.Y. Ding, T.Y. Xia, T. Zhang, S.B. Zhang, Y.M. Wang, X. Han, J.G. Li2013年被引用 17Nuclear FusionIF 3出版社

A series of ELMy H-mode discharges were achieved on Experimental Advanced Superconducting Tokamak (EAST) with low hybrid wave (PLHW = 0.5–1.7 MW at 2.45 GHz) and ion cyclotron resonance frequencies (PICRF = 0.5–2 MW) as the auxiliary heating power in 2012. In double-null (DN) configurations, the experimental power threshold with a molybdenum wall (2012) appears to be lower than that with a graphite wall (2010). For lower single null (LSN) plasmas, the lower X-point configuration has a lower power threshold, and a significant reduction (∼25%) in the H-mode power threshold with 3.4 cm X-point movement is achieved. The lower X-point configuration on EAST has higher dRsep below zero (closer to the DN configuration). Better energy confinement is observed in DN compared with single null (SN) at the same power loss. For reasons not understood, when the ion grad-B drift is in a favourable direction for H-mode access (towards the X-point) for EAST's LSN configuration, H-mode is achieved in upper single null (USN) configurations, but not in LSN.

日本語訳

一連のELMy Hモード放電が、実験先進超伝導トカマク(EAST)において、低ハイブリッド波(PLHW = 0.5–1.7 MW、2.45 GHz)およびイオンサイクロトロン共鳴周波数(PICRF = 0.5–2 MW)を補助加熱電力として2012年に達成された。二重零(DN)配位では、モリブデン壁(2012年)における実験的パワー閾値は、グラファイト壁(2010年)の場合よりも低いことが示された。下部単一零(LSN)プラズマでは、下部X点配位の方がパワー閾値が低く、3.4 cmのX点移動によりHモードパワー閾値の有意な低減(約25%)が達成された。EASTにおける下部X点配位は、dRsepがゼロ以下でより大きい値(DN配位により近い)を示す。同じ損失電力において、DNは単一零(SN)と比較して優れたエネルギー閉じ込めが観測される。理解されていない理由により、EASTのLSN配位においてイオン∇BドリフトがHモード到達に有利な方向(X点方向)である場合、Hモードは上部単一零(USN)配位では達成されるが、LSNでは達成されない。

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