Stationary high-performance discharges in the DIII-D tokamak
Stationary high-performance discharges in the DIII-D tokamak
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DOI：
10.1088/0029-5515/43/5/304
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发表时间：
2002-11
期刊：
影响因子：
3.3
通讯作者：
T. Luce;M. Wade;J. Ferron;A. Hyatt;A. Kellman;J. Kinsey;R. L. Haye;C. Lasnier;M. Murakami;P. Politzer;J. Scoville
中科院分区：
文献类型：
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作者：
T. Luce;M. Wade;J. Ferron;A. Hyatt;A. Kellman;J. Kinsey;R. L. Haye;C. Lasnier;M. Murakami;P. Politzer;J. Scoville
在DIII-D托卡马克装置上，在相对较低的等离子体电流（q_（95）>4）的稳态条件下，实现了满足燃烧等离子体实验高增益目标的放电。聚变增益的品质因数（？NH 89/q952）已保持在对应于Q = 10的值在燃烧等离子体中操作>6？s或36？E和2？R.关键要素是电流分布松弛到qmin>1的稳态。在没有锯齿和鱼骨的情况下，稳定运行已达到预计的无壁？极限能量含量和颗粒存量的反馈控制允许可再现的、稳定的操作。颗粒存量由气体燃料和主动泵送控制;壁在颗粒平衡中仅起很小的作用。减少的电流大大降低了在发生重大中断时结构损坏的可能性。此外，脉冲长度的能力大大增加，这是必不可少的技术测试阶段的燃烧等离子体实验的注量（占空比）是很重要的。
Discharges which can satisfy the high gain goals of burning plasma experiments have been demonstrated in the DIII-D tokamak under stationary conditions at relatively low plasma current (q95>4). A figure of merit for fusion gain (?NH89/q952) has been maintained at values corresponding to Q = 10 operation in a burning plasma for >6?s or 36?E and 2?R. The key element is the relaxation of the current profile to a stationary state with qmin>1. In the absence of sawteeth and fishbones, stable operation has been achieved up to the estimated no-wall ? limit. Feedback control of the energy content and particle inventory allow reproducible, stationary operation. The particle inventory is controlled by gas fuelling and active pumping; the wall plays only a small role in the particle balance. The reduced current lessens significantly the potential for structural damage in the event of a major disruption. In addition, the pulse length capability is greatly increased, which is essential for a technology testing phase of a burning plasma experiment where fluence (duty cycle) is important.