Observation of High Recycling Steady H-mode edge and compatibility with improved core confinement mode on JFT-2M
作者： K Kamiya , H Kimura , H Ogawa , H Kawashima , K Tsuzuki
DOI: 10.1088/0029-5515/43/10/024
关键词: Atomic physics 、 Particle transport 、 Materials science 、 Effective radiated power 、 Transport barrier
摘要: A new operational regime has been discovered on JFT-2M under the boronized first wall condition to produce High Recycling Steady (HRS) H-mode, which is characterized by good energy confinement (H89P ~ 1.6) at a high density of around 70% Greenwald (ne/nGW), low radiated power fraction, and complete disappearance large ELMs. Accompanying HRS H-mode transition, coherent magnetic fluctuation seen probes vessel wall. These fluctuations have frequency order 10–100 kHz with significant variation. They are recognized as important in enhancing particle transport, whose characteristics similar Enhanced Dα (EDA) reported from Alcator C-Mod. The H'-mode, previously observed JFT-2M, had features common EDA mode terms fluctuation, but it appeared transiently. operating also mode, except that even q95 (2 < ≤ 3). most feature edge compatibility an improved core without We demonstrated internal transport barrier can be produced condition, achieving βNH89P 6.2 ne/nGW 70%,
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