Fast-ion transport in qmin>2, high- β steady-state scenarios on DIII-Da)
Fast-ion transport in qmin>2, high- β steady-state scenarios on DIII-Da)
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DOI：
10.1063/1.4921152
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发表时间：
2015-05
影响因子：
2.2
通讯作者：
C. Holcomb;W. Heidbrink;J. Ferron;M. Zeeland;A. Garofalo;W. Solomon;X. Gong;D. Mueller;B. Gr
中科院分区：
文献类型：
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作者：
C. Holcomb;W. Heidbrink;J. Ferron;M. Zeeland;A. Garofalo;W. Solomon;X. Gong;D. Mueller;B. Gr
DIII-D的实验结果[J. L. Luxon，Fusion Sci. 48，828（2005）]的研究证实，快离子输运是使用中性束注入电流驱动的先进托卡马克发展的关键问题。在DIII-D中，施加大于11 MW的中性束加热功率，目的是最大化βN和无感电流驱动。然而，在qmin>2的情况下，目标是下一步稳态反应堆模型中使用的q95= 5-7的典型范围，阿尔文本征模导致比经典模型预测更大的快离子输运。这种增强的传输降低了所吸收的中性束加热功率和电流驱动，并限制了可实现的βN。相比之下，类似的等离子体，除了与qmin刚刚超过1具有近似经典的快离子传输。实验表明，采用qmin>3的等离子体到更高的βP（q95= 11-12）来测试长脉冲操作，表现出比预期的更好的热约束机制。
Results from experiments on DIII-D [J. L. Luxon, Fusion Sci. Technol. 48, 828 (2005)] aimed at developing high β steady-state operating scenarios with high- qmin confirm that fast-ion transport is a critical issue for advanced tokamak development using neutral beam injection current drive. In DIII-D, greater than 11 MW of neutral beam heating power is applied with the intent of maximizing βN and the noninductive current drive. However, in scenarios with qmin>2 that target the typical range of q95= 5–7 used in next-step steady-state reactor models, Alfven eigenmodes cause greater fast-ion transport than classical models predict. This enhanced transport reduces the absorbed neutral beam heating power and current drive and limits the achievable βN. In contrast, similar plasmas except with qmin just above 1 have approximately classical fast-ion transport. Experiments that take qmin>3 plasmas to higher βP with q95= 11–12 for testing long pulse operation exhibit regimes of better than expected thermal confineme...