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Simultaneous realization of a high density edge transport barrier and an improved L-mode on CHS

Takashi Minami, Shoichi Okamura, Chihiro Suzuki, Keiji Matsuo, Tetsutarou Oishi,, Tsuyoshi Akiyama, Mitsutaka Isobe, Katsumi Ida, Haruhisa Nakano, Akihide Fujisawa2009年被引用 1Nuclear FusionIF 3出版社

An edge transport barrier (ETB) formation and an improved L-mode (IL mode) have been simultaneously realized in the high density region () on the Compact Helical System (CHS). When the ETB is formed during the IL mode, the density reduction in the edge region is suppressed by the barrier formation. As a result of the continuous increase in the temperature by the IL mode, the stored energy during the combined mode increased up to the maximum stored energy (Wp ∼ 9.4 kJ) recorded in the CHS experiments. The plasma pressure in the peripheral region increases up to three times compared with the L-mode, and the large edge plasma pressure gradient is formed accompanying the pedestal structure. This is caused by the anomalous transport reduction that is confirmed by the sharp drop in the density fluctuation in the edge region. The neutral particle density reduction in the peripheral region and the metallic impurity accumulation in the core plasma are simultaneously observed during the high density ETB formation.

日本語訳

エッジ輸送障壁(ETB)の形成と改善Lモード(ILモード)が、コンパクトヘリカルシステム(CHS)の高密度領域()において同時に実現された。ILモード中にETBが形成されると、エッジ領域における密度減少は障壁形成によって抑制された。ILモードによる温度の連続的な上昇の結果、複合モード中の蓄積エネルギーは、CHS実験で記録された最大蓄積エネルギー(Wp ∼ 9.4 kJ)まで増加した。周辺領域のプラズマ圧力はLモードと比較して最大3倍まで上昇し、ペデスタル構造を伴う大きなエッジプラズマ圧力勾配が形成された。これは、エッジ領域における密度揺動の急激な低下によって確認された異常輸送の低減に起因する。高密度ETB形成中には、周辺領域における中性粒子密度の減少とコアプラズマにおける金属不純物の蓄積が同時に観測された。

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Transport barrierL-modeEdge transportCompact Helical System
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