A two-term model of the confinement in Elmy H-modes using the global confinement and pedestal databases
A two-term model of the confinement in Elmy H-modes using the global confinement and pedestal databases
复制标题
使用全局约束和基座数据库的 Elmy H 模式约束的两项模型
DOI：
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发表时间：
2003
期刊：
影响因子：
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通讯作者：
J. Cordey
中科院分区：
文献类型：
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作者：
J. Cordey
对两种不同的h型基座物理模型进行了基于关节基座-核心数据库的测试。第一种是约束模型，其中沿陡峭边缘梯度的输运被假设为热传导主导。第二个模型是磁流体力学（MHD）极限模型，该模型假设主要的损失机制是由边缘局域模式（elm）造成的，压力梯度由MHD稳定性极限决定。然后将这些模型与核心模型相结合，并显示出与ELMy H-mode数据库的良好拟合。结果显示，在下一步机器ITER和FIRE中，所得到的两项缩放表达式给出了与单项模型IPB98（y,2）非常相似的约束时间预测。预计在基座上储存的能量是总储存能量的28-50%。
Two different physical models of the H-mode pedestal are tested against the joint pedestal–core database. The first is a confinement model in which the transport down the steep edge gradient is assumed to be dominated by thermal conduction. The second model is a magnetohydrodynamics (MHD) limit model in which it is assumed that the dominant loss mechanism is by the edge localized modes (ELMs), the pressure gradient being determined by a MHD stability limit. These models are then combined with models for the core and shown to give a good fit to the ELMy H-mode database. The resulting two-term scaling expressions are shown to give very similar predictions for the confinement time, in the next step machines ITER and FIRE, to that of the one-term model IPB98(y,2). The predicted stored energy in the pedestal is 28–50% of the total stored energy.