ELM pacing using modulated non-axisymmetric magnetic fields on DIII-D
ELM pacing using modulated non-axisymmetric magnetic fields on DIII-D
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DOI：
10.1088/0029-5515/52/3/033007
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发表时间：
2012-03
期刊：
影响因子：
3.3
通讯作者：
W. Solomon;K. Burrell;A. Garofalo;R. Groebner;C. Lasnier;M. Makowski;T. Osborne;H. Reimerdes;J. Degrassie;E. Doyle;T. Evans;M. Fenstermacher;G. Jackson;M. Schaffer
中科院分区：
文献类型：
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作者：
W. Solomon;K. Burrell;A. Garofalo;R. Groebner;C. Lasnier;M. Makowski;T. Osborne;H. Reimerdes;J. Degrassie;E. Doyle;T. Evans;M. Fenstermacher;G. Jackson;M. Schaffer
使用调制n=3非轴对称磁场的边缘局域模式(ELM)起搏已经在DIII-D上被演示在广泛的条件下，包括温度、βN、密度和形状的显著变化。在低碰撞度时，起搏导致ELM尺寸和流向偏滤器的峰值热流明显减少，对于短时间窗口，最高可达5-6倍，尽管对于具有当前硬件能力的持续周期，仅为2倍。在较高的碰撞程度下，虽然ELM频率也有类似的增加，但通常没有观察到直接作为起搏结果的热通量显著减少。然而，似乎可以通过改变L-H功率阈值来间接减小ELM的尺寸，这是与应用非轴对称场相关的密度泵浦的结果。在这个阶段，尚不清楚未能通过调制场减小ELM大小是与高对撞性、高密度或相对接近L-H功率阈值有关的限制。
Edge localized mode (ELM) pacing using modulated n = 3 non-axisymmetric fields has been demonstrated on DIII-D over a wide range of conditions, including significant variations in temperature, βN, density and shape. At low collisionality, the pacing results in a clear reduction in the ELM size and peak heat flux to the divertor, up to a factor of 5–6 for short time windows, although only a factor of two for sustained periods with the present hardware capability. At higher collisionality, although similar increases in the ELM frequency have been demonstrated, no meaningful reduction in the heat flux is typically observed as a direct result of the pacing. However, it appears that the ELM size may be reduced indirectly via changes in the L–H power threshold as a result of density pumpout associated with the application of non-axisymmetric fields. At this stage, it remains unclear whether the failure to reduce the ELM size with modulated fields is a limitation associated with high collisionality, high density, or relative proximity to the L–H power threshold.