Structure, stability and ELM dynamics of the H-mode pedestal in DIII-D
Structure, stability and ELM dynamics of the H-mode pedestal in DIII-D
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DOI：
10.1088/0029-5515/45/12/004
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发表时间：
2004-10
期刊：
影响因子：
3.3
通讯作者：
M. Fenstermacher;T. Osborne;A. Leonard;P. Snyder;D. Thomas;J. Boedo;T. Casper;R. Groebner;
中科院分区：
文献类型：
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作者：
M. Fenstermacher;T. Osborne;A. Leonard;P. Snyder;D. Thomas;J. Boedo;T. Casper;R. Groebner;
这些实验增加了我们对输运和稳定性物理的理解，这些实验设置了H模边缘基座的宽度和高度，确定了I类边缘局域模式(ELM)的开始，并产生了基座和刮离层(SOL)中ELM微扰的非线性动力学。现在已经有了关于I型榆树开始时的Ne基座轮廓和PE高度的模型，并且在Te基座宽度和非线性榆树演化模型方面取得了进展。DIII-D和JET的相似实验表明，中性穿透物理在Ne基座的宽度和高度关系中起着重要作用。等离子体物理似乎在设置Te基座宽度方面占主导地位。测量的底座条件，包括ELM开始时的边缘电流，与中间n剥离-气球(P-B)稳定性预测一致。中面ELM动力学数据显示，ELM开始时的预测(P-B)结构、溶胶层参数的快速变化和后期的快速径向传播，类似于非线性ELM模拟的特征。
Experiments are described that have increased our understanding of the transport and stability physics that set the H-mode edge pedestal width and height, determine the onset of Type-I edge localized modes (ELMs) and produce the nonlinear dynamics of the ELM perturbation in the pedestal and scrape-off layer (SOL). Models now exist for the ne pedestal profile and the pe height at the onset of Type-I ELMs, and progress has been made towards models of the Te pedestal width and nonlinear ELM evolution. Similarity experiments between DIII-D and JET suggested that neutral penetration physics plays an important role in the relationship between the width and height of the ne pedestal. Plasma physics appears to dominate in setting the Te pedestal width. Measured pedestal conditions including edge current at ELM onset agree with intermediate-n peeling–ballooning (P–B) stability predictions. Midplane ELM dynamics data show the predicted (P–B) structure at the ELM onset, large rapid variations of the SOL parameters and fast radial propagation in later phases, similar to features in nonlinear ELM simulations.