A long-pulse high-confinement plasma regime in the Experimental Advanced Superconducting Tokamak
A long-pulse high-confinement plasma regime in the Experimental Advanced Superconducting Tokamak
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DOI：
10.1038/nphys2795
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发表时间：
2013-12-01
期刊：
影响因子：
19.6
通讯作者：
Zou, X. L.
中科院分区：
文献类型：
--
作者：
Li, J.;Guo, H. Y.;Zou, X. L.
高性能、长脉冲运行是当前磁聚变研究的重要目标。在这里，我们证明了一个高约束等离子体制度被称为H-模式的记录脉冲长度超过30秒的实验先进超导托卡马克维持较低的混合波电流驱动（LHCD）与先进的锂壁调节。我们发现，LHCD提供了一个灵活的边界控制无处不在的边缘不稳定性的H模式等离子体被称为边缘本地化模式，这导致显着减少在血管壁上的热负荷相比，标准的边缘本地化模式。LHCD还诱导边缘等离子体遍历，其加宽热沉积足迹。通过调节边缘等离子体条件，可以主动控制由这种遍历引起的热传输。这可能为热流控制提供了新的手段，这是下一步聚变发展的关键问题。
High-performance and long-pulse operation is a crucial goal of current magnetic fusion research. Here, we demonstrate a high-confinement plasma regime known as an H-mode with a record pulse length of over 30 s in the Experimental Advanced Superconducting Tokamak sustained by lower hybrid wave current drive (LHCD) with advanced lithium wall conditioning. We find that LHCD provides a flexible boundary control for a ubiquitous edge instability in H-mode plasmas known as an edge-localized mode, which leads to a marked reduction in the heat load on the vessel wall compared with standard edge-localized modes. LHCD also induces edge plasma ergodization that broadens the heat deposition footprint. The heat transport caused by this ergodization can be actively controlled by regulating the edge plasma conditions. This potentially offers a new means for heat-flux control, which is a key issue for next-step fusion development.